TTSH rev.3 build Power wiring TTSH rev.3 Pictures BOM TTSH Rev.3 known Issues TTSH Rev.3 Hardcore builders guide Modifications

Status: FINISHED

Startdate: 21.Dec.2016

Duedate: 31.Dec.2016


last update 06 March 2019 Mouser BOM project updated


update 12.Jan.2017 Mouser Link updated

update 13.Jan. 2017  Major bug found

update 15.Jan. 2017 Excel list Slider quantity corrected

update 16.Jan. 2017 Major bug update for jacks in total 3 jacks.

update 18.Jan.2017 BOM excel list - added a "approved row", website improvements

update 26.Jan. 2017 multiturn trimmer for v/oct improvement (optional), Noise transistor bug/improvement added from rev.1/2 guide,

update early february Mouser BOM updated (bypass vco capacitors, VCF4072 capacitors.)Excel list updated with switches.

update 19 Feb 2017:  known Issues - clock/s/h resistor

update 20 Feb 2017 added a quick build guide for builders with TTSH experience

update 03 March 2017 known Issues updated, Reverb connector

update 06 March 2019 Mouser Bom project updated

Manufacture link: http://thehumancomparator.net/


due to changes in my webhosting (rootserver) costs for RAM/Backup and my worktime in Adminstration of the Server & Web Application Server it would be very helpful to use my paypal gift function, thank you

This guide is complete yet ( last update on 18.Jan.2017)

please check my rev.2 build guide and hardcorebuildguide, gatebooster pages, that gives you more infos and knowledge.

the TTSH project isn`t for beginners !

Feel free to register a account for free, you can comment, export pages, you stay informed with pageupdates by email.

send messages to me and other users with the share page function ( in top right corner)

you can send me a message if you want edit my pages, i´m looking for supporters.

further i´m looking for authors too, please contact me

Table of Contents

Trusted Builders:

NameRegionContact
FuzzbassUSAfuzzbass "at" verizon.net
ElmigelUSAPete.hartman "at" gmail.com
Dave.HUSAishkabbible "at" gmail.com
LED-manEurope/worldwidecheck my Impressum

Schematics:

http://thehumancomparator.net/wordpress/wp-content/uploads/2014/05/TTSHv3Schematics.pdf


you find the known erros/issues in "the tabs on top"

rev.3 Build Guide

This guide is for users with experience in SDIY, you need a scope and a frequency counter, DMM/DVM/LCR-Meter)

i dont share infos about polarity of capacitors, this basics skills are required, otherwise feel free to ask me for a assembly service. (check the trusted builder list)

please use a fume extractor.

its needed to solder 6 SMT caps in 0805 format and 2 SMT power regulators.

this guide is a best practice guide, i´m not responsible for failures/malfunctions/defects.


  1. lets start with the powersupply board - add all needed parts on the pcb, start with the two SMT power regulators.
    there is one missing part (a dual choke) - please use wire links here or resistor legs
    turn the 2 pol MTA header as described in the picture
    if needed - wash the pcb carfully on the solderside
    testing/trimming: use a 18-24V DC powersupply for input and set the output to 15V/-15V by usage of the both trimmers
    measure between -V and 0  and +V and 0



  2. Mainboard PCB - place all IC-Sockets ( tin one ic socket from top, place the ic socket and heat the ic socket pin - the socket drop in place
    on the rear side of the PCB is for the LED driver a ic socket - we dont use this one - don't solder a ic-socket here ! see step14
  3. best practise - begin with the "most use values" and end with the value range Mainboard PCB - start with 100K resistors, 10K, 1K, 1M, 100R (reverb), 10R (Amp) 10M (top right)
    if done - 47k, 4k7, 470K, 4M7, –   22K, 220K, 220R, 2M2, 33K, 3M3, 330K... — 30K1, 680R, 68K, 68K1, 680K...  ..... and all other
    please remember: on solderside are few resistors too - on VCO 4027 boards and filter boards too - its your choice to leave it for later or assembly it yet too (i prefer later)
  4. Mainboard PCB - place all rectifiers 1N4148
  5. solder from top all parts
  6. cut the resistor and rectifier legs from bottom side
  7. place all MLCC caps and solder from top
  8. place all polyester/polypropylene caps - bend the legs from top
  9. add all transistors in place and solder one pin from top -(except the 2N3954, both 2N3958 - if you cant test this, use a milled IC-socket and cut the pins out - use this as socket)
  10. turn the pcb and solder all pins. (no switches, no fader, no jacks, no pot, no trimmers)
  11. you find on solderside few resistors - but take a look at step 14 - you don´t need the 3 resistors for the LED driver ( LEDs works too)
  12. wash the pcb 2-3 times if needed, i use Ispopropylen alcohole
    - make a breaktime/pause yet - the pcb needs time to dry
  13. if you don't need a break time/pause - assembly the filterboards and 3 VCO 4027 boards - wash the pcbs too, make sure you use flat 10uF electrolyte capacitors, use c0g, polypropylen or silvamica for the 680pF cap,  don`t mount the connectionsheaders yet
  14. on the PCB solder side, there is ic socket for the LED driver (near the multiples) its needed to bridge with a resistor leg the middle pins
    on TTSH V2 and V3, you can easily modify the LED system so as to trim the LEDs all the way of off. Replace the 3k3 resistor located next to the TL071 pads to a jumper.  Tested. 

  15. Mainboard pcb: its time to add all other parts on the pcb -  i prefer multiturn trimmers for the VCO V/oct trimmers  20K or 25K, but remember this can´t mounted on the frontpanel pcb side due to sizing, you have to open your TTSH for trimming the VCOs,   begin with trimmers, faders - for faders keep attention on correct pcb side,  best practice for faders:  turn the pcb upwards on your desk add 4 faders in place, one hand holds the faders with other hand bend the faderpins with a flat screwdriver,  solder all faders,  add the Gain pot on top and solder them.
  16. add the header/sockets for VCOs, Filtercard - best practice: mount each header in socket - put them in place on the pcb - add the vco pcb on top and solder at first on top (sub vco pcb to header)  not the header to mainboard pcb.
    then start the soldertask for the other side.
  17. check on your pcb other parts:  you need to assembly few 2pol, 5pol MTA headers (gate/trigger/power) solder in the RCA jack for reverb (see known issues for wrong silkscreen), you have to add a 3 pol MTA header to powering the optional Gatebooster and/or TTSH sync board , on each section you find 6 pol holes.
  18. now its nearly done - doublecheck all solderpoints, missing resistors,caps..
  19. add the 13x 12mm spacers for speaker to pcb, dont fix it very strong - we need to align this in step 22
  20. you find on the pcb on left bottom near the speaker hole switch adapter pcbs, cut them out and place they behind the switches
  21. setup all 81jacks in place, don`t solder the jacks yet
  22. place the frontpanel on the pcb/spacers - fix it with screws - if needed align the spacers
  23. add on each corner a washer and nut to a jack and at the bottom/near of the voltageprocessor
  24. at this time you need four hands if possible.. to turn the pcb without loosing jacks
  25. solder at first the jacks from step 21
  26. check the switch positions, align it and solder 1-2 pins (middle pins), check again the positions, if needed correct it.
  27. if the alignment of all parts are fine, solder all switches and jacks
  28. if needed clean with eartips and isopropylene the solderpoints of silder/switches/jacks
  29. add the 3 VCO 4027 modules and one filtercard in place.
  30. time for wiring: speaker wiring/headphone,

    WARNING:  never put a MONO plug in the headphone amp or your 10R resistors goes with smoke in the hell 


    TTSH rev.2+3 speaker wiring - approved (tick)


  31. unmount the panel,  add 3 long spacers (20-50mm to the 3 holes near voltage processor - the stands are used for the powersupply yet - mount the psu pcb on top), remount the panel
  32. wire the power-switch between + line and the powersupply pcb input

for power between power supply and mainboard  - double-check the polarity,

rev.3 Quick build guide ( thanks to Anthony A Flagg  aka fuzzbass)

this guide is only for builders with TTSH experience, dont try it if you build a TTSH before, the guide contains a BOM with partnumbers too.

V3 quick build bom.xlsx  (right click to "save as")

TTSH Trimming - calibration

last update: June 2020 for 4072 Filtercard, big thanks to Anthony A Flagg


works best with Scope and good DMM (4,5digits with less than 1% tolerance)


make sure your device works without smoke, smell, all LEDs are on, your VCO/VCF/VCA works.

before you start, let the TTSH in a room with stable temperature, power on the TTSH for 30 min. before you start the calibration.

make sure you have no jumper on kbd/cv pcb header (was used in TTSH rev.1 buildguide)


Table of Content

Powersupply (for rev.3)

trim to excactly -15V/15V by usage of the Powersupply Multiturn trimmer, measure between -V and 0  and +V and 0

use a 12V - 24DC powersupply at the input.

Ring modulator

before you start with the Ringmodulator calibrate the VCO2 Sinewave and check the function of VCO1


Positive Null
01) Put switch in DC position
02) Raise VCO 1 slider only
03) Monitor output with oscilloscope and adjust POS NULL for minimum output

Negative Null
01) Put switch in AC position
02) Raise VCO 1 slider only
03) Monitor output with oscilloscope and adjust NEG NULL for minimum output

Gain
01) Raise both sliders into Ring Modulator and set switch to DC
02) Adjust GAIN trimmer for 20Vpp maximum

VCO 1 to 3


V/oct adjustments  (own Info: start with VCO1 - use the Mixer to doublecheck the same initial frequency and lowest/highest frequency to get the same values on all VCOs)
01) Monitor output with frequency counter or tuning standard
02) Depress low C and adjust frequency for 100Hz using coarse or fine tune slider
03) Depress high C and adjust 1V/OCT trimmer for 1600Hz
04) repeat 2 and 3 until C are correct

Frequency calibrate
01) Monitor output with oscilloscope or frequency counter
02) All FM sliders down
03) Remove keyboard CV from selected VCO
04) Put frequency slider far right (maximum)
05) Put fine tune slider – mid range
06) Adjust FREQ CAL for 8.33kHz

VCO-1
Pulse width
01) Monitor square wave output with oscilloscope and adjust SYMMETRY trimmer for 50% duty cycle.

VCO-2 Wave shape adjustments Symmetry
01) Monitor triangle output with oscilloscope
02) Adjust the "Symmetry" trimmer for best triangle waveform (you move the waveform to an triangle - you find at the waveform a spike which must be moved to get a sharp peak/top notch

DC offset adjust  for the Sine Wave

01) Monitor sine wave output with oscilloscope

02) Adjust "OFFSET" trimmer so the peaks of the triangle waveform is not flat or either end - (the waveform voltage for -/+ Volt must be balanced to get the best waveform balance)

Gain adjust 
01) Monitor sine wave output with oscilloscope
02) Adjust GAIN for 10Vpp output

Mostly this step is combined with Purity - sometimes you have to give more than 10VPP to start the bending of an triangle to an Sine Wave

Purity adjust
01) Adjust PURITY for best sine waveform
It might b e necessary to readjust calibrations after performed in the order listed.

note: if you don`t get a SINE wave ,  but often its just an failure from the calibration method - if you have trouble change the gain to 12-15VPP, then turn the purity trimmer)

but sometimes is a faulty 2N3958 the problem, mostly cheap Chinese fakes 

VCF with 4012 VCF (original TTSH)


Frequency calibration
01) Monitor VCF output with an oscilloscope or frequency couter
02) Initial frequency slider – left
03) Fine tune slider – mid range
04) Resonance slider – right
05) All VCF inputs sliders – down
06) Disconnect or use dummy plug for KYBD CV in
07) Adjust FREQ CALIBRATE for 10Hz output

V/oct adjust
01) Repeat steps for frequency calibration but reconnect the CV keyboard
02) Depress low C (0 volts)
03) Adjust initial frequency slider and fine tune slider for 200Hz
04) Depress C three octaves higher and adjust 1V OCT trimmer for 1600Hz
05) Repeat step 2-4 until low C remains at 200Hz and C3 remains at 1600Hz

Output offset
01) Monitor VCF output with oscilloscope
02) Initial frequency, fine tune, and resonance slider – left
03) All input sliders down
04) Adjust OUTPUT OFFSET for minimum DC output. Movement of the initial frequency slider should not cause more than 1V deflection

Gain adjust
01) Open VCF initial frequency slider – right
02) Resonance slider – left
03) Raise VCO1 input slider and adjust GAIN for same amplitude as measure at VCO1 output


VCF 4072


The only calibration adjustment that seems to make any difference with the 4072 filter module is Initial Frequency. When you remove the 4012 filter and install the 4072 filter, the Initial Frequency is shifted way down, so that the cutoff frequency is at sub audio range somewhere around 75% on the Coarse Frequency control. This one calibration needs to be repeated when changing between filter modules. The 1V/Oct panel trimmer is efficacious with the 4012 filter module, so should be adjusted for that unit, and should be undisturbed when swapping. The Offset and Gain trims work the same for both filters, and should also be undisturbed when changing filters.

The following procedure is written for end-user, and is simplified. Obviously a builder may have a more precise means of measurement.

This is based on the following standards:
a. Note C1 (MIDI note 24) = 32.70Hz
b. 0.00VDC on KBD CV bus produces note C1 at VCO1-3 and VCF cutoff frequency

If you have a different standard, adjust the target frequency you adjust to in step 8 accordingly.

1. Disconnect power and open the case, or unmount the panel if using the standard steel case.
2. Remove the in-use filter module, and install the alternate one.
3. Re-assemble, and power up the instrument. Let it warm up for 20 minutes.
4. Using a midi keyboard and midi to CV device, drive C5 (midi note 72), to produce +4.00V on the KBD CV bus.
5. Adjust the filter’s Coarse Frequency control to minimized, the Fine Frequency control is in the middle, and the Resonance control to maximum.
6. Disconnect any audio and CV inputs, and minimize their controls to the filter.
7. Connect the output of the filter into a guitar tuner. It may help to use the mixer section to attenuate the signal down to guitar level, which is something like .5V p-p (-20dB from the VCF output of 10V p-p).
8. Adjust the Freq. Calibrate trimmer from the front panel in the VCF to get C5/523hZ on the tuner. Getting close is probably good enough here.



VCA


Linear gain
01) Monitor VCA output with oscilloscope
02) Patch VCO3 saw to VCA ‘VCF Input’ jack and raise audio slider fully
03) Put initial gain slider – left (minimum)
04) Raise VCA AR control slider all way
05) Depress and hold the manual start button and adjust LINEAR GAIN for 10Vpp maximum signal output

Control rejection
01) Repeat steps 1-3 for linear gain adjustment
02) Patch VCO2 LF sine wave (2Hz) into VCA AR control input
03) Close VCA VCF input slider
04) Adjust CONTROL REJ for minimum output

High frequency reject
01) No adjustment necessary

Exponential gain
01) Set EXP’L GAIN trimmer fully clockwise
Experiment with exponential setting…

Internal Clock


Init. frequency
01) Monitor the internal clock output with an oscilloscope
02) Put rate slider at max
03) Adjust INIT trimmer so the square wave doesn’t disappear at max rate setting

Pulse width
01) Monitor Internal clock output with an oscilloscope
02) Put RATE slider at max
03) Adjust WIDTH trimmer for 50% duty cycle


 

Troubleshooting knowledge

i ran in some difficult errors in some TTSHs, here are my experiences

for unknown issues/Errors check this page: useful Documentation for Troubleshooting


Knowledge numbersymptomProbable error sourceProbability of occurrencepre checktestingworkaroundfixlessons learned
TTSH-1

VCO bleed (usage of frequency slider from one OSC influenced other VCOs frequency

or

Frequency range isn´t good enough

or

screaming VCO - weird frequency / instable Frequency

LFO/VCO switch (LF switch)80%

insert a stable v/oct signal

(doublecheck with other devices your v/oct signal)

press/push/wiggle the LF switch,

if you hear or measure a better result ->


heat up the 6 switch pins

normally a resolder/heatup fix the issue


the switch pins must be soldered with other soldercore or better heated/other solder tip.
TTSH-2all Slider LEDs are offTrimmer, LED Driver

turn on the frontpanel (left hand) the LED trimmer clockwise,

check on the frontpanel side on the empty IC socket next that you bridged pin 6+7 and no IC is plugged inside the socket.

if not fixed: measure on the 5 pole powerheader all voltages

n/a

dont forget the jumper/bridge on pin 6-7
TTSH-3few Slider LEDs are offTrimmer, LED Driver50%

turn on the frontpanel (left hand) the LED trimmer clockwise,

the TTSH LEDs are connected in 6? chains and in each chain are all slider LEDs in series -

so you must check the correct LED polarisation (you can see the cathode/anode without demounting)



swap the LED to correct orientationdont trust machines/roboter
TTSH-4all VCOs dont workVCO 4027 boards10%

are the VCO subboards correct mounted ? (check the board connectors)

are the CA3046 ICs inside ?

check the soldering of the board connectors




solder all VCO conenctor pins before mounting the silders, add the CA3046 while mounting the connectors to the subboards
TTSH-5

cant get a VCO sine wave in trimming/calibration process.

(you get only a triangle)

VCO-2 section80%

check OP-amp orientation

check J-FET (2N3954) instead 2N3958

oscilloscope shows at the TRI out a Triangle - if not fix it before.



check the symmetry at first for the triangle,

use gain to setup 10v

then use the offset to bend the triangle spikes - they must form a corner in combination with purity.

setup again 10v.

its not a easy job - try it again - the trick is the combination of offset and gain not the purity !


before you swap the 2N3954 try other ways as before by trimming the 4 trimmers , many guys swapped the working jfets..
TTSH-6ttsh works as a drone synth (by usage of cv/gate - the ttsh plays  always sound instead of note on/off control)
80%

check your silder settings -

at the VCA output mixer - only VCA output instead of VCF or VCF and VCF.




read the usermanual
TTSH-7by usage of the reverb function, a hum/noise occurs
80

see known issues - in/out silksceen is wrong

check your noise is off (wink)

check the wiring



use double or triple shielded cable with good RCA connectors, not the Synthcube cable "solution"

the reverb distance must around 10cm or more from pcb to minimize the risk of EMV to the tank.

check the grounding of signal input in the reverb, input and output must be grounded.

check the cable with a rectifier test, check the soldering of the RCA connectors on the ttsh pcb.

make sure you have the correct reverb type (grounding and impedance)

reverbs are very sensitive for EMV*









TTSH-8ADSR Release time opens the VCA and at 20fader way, the releasetime is too long
50check all parts for correct value, check my pictures subpage

replace the 2N5460 or 2N4392test all trannys before soldering
TTSH-9sound from speakers - without OSCs enabled/installed
30

if the 10R resistors in the Amplifiers are hot or the MJE172 are hot, check the orientation of the MJE172 - the unlabeled side is at the white marker from the PCB.

AND

you have a short or defect opamp on your TTSH, which blows your MJE172 and the 10R resistors within 30seconds.

you have to use a Bench power supply with current limiter, otherwise you freeze again the MJE172.

you can cut at the 1UF elks the 6 pol power header - and connect it later with PC jumpers or use resistors legs to bridge the -15715V rails.




TTSH-10power separation - in case of POWER FAILURES or shorts 

use a Labor bench with current limiter.


separate the Sections, by cutting the traces. 


TTSH-11reverb doesn't work BL2AB3C1B


connect a cable from the black cable from left to the black cable on right side



Best Practise:


IDTIPreason
1when you have finished the build, move 2-3 times every slideroften the sliders cause some issues, they hang - only when you have moved the sliders 2-3 times they start to normal work
2use Anti Rotating washers for the 5 nuts at the component side of the PCB
3do not trust every information regarding an audio path upgrade or subs. for the LM301

you can always use: LM101, LM201 too - they have a better temp. stability than a LM301

they are also available in SMD package and works great.

if you want an audio path upgrade, contact me and you get an offer. I do not share my secrets because some companies copy this ideas for his cheap clones.

I spend few days and a lot of money in testing different opamps (which mostly need addional part changes on the pcb)

4MODIFICATION

"Essential"

Gatebooster Mod.

VCF decoupling 1uF or more


"my standard"

Essential plus:

Electronic switch mod

AR MOD

ADSR Switch

Audiopath upgrade

1% matched capacitors in VCF

1% 680pF Styrene in VCO

High temp. drift OPamps in VCO


Highend:

Essiontial plus "my standard" plus:


Waveshaper MOD with subosc.

some additional part changes -  PSU passive cooling blocks

Balanced driver with XLR


5why not install the MIDI mod ??

you have a half modular system - a intern MIDI gives you only the option to connect internal 2 CV connections.

if you use a Kenton MIDI Standalone Interface (PRO SOLO MK2 or 3 etc ) - you can  patch to every jack you want ! like the Ringmodulator or VCA etc...



6why not install the VCO SYNC option ?

the mod isn't very easy for beginners or amateurs, the most users have problems with soft sync (when the SYNC is off) and many users blown the VCO SUB boards Transistors, which are not easy to replace. ( I have spare pcbs ) and if you install the Waveshaper board your risk of some VCO/EMV bleeds  are bigger than before.


The main reason is the sound, there's not a big difference in sound between a Ring MOD sound and a SYNC sound !!! 

check also the rev.3 buildguide pictures with HQ pictures ( thank you Björn Verbruggen)


Stats





see Speaker wiring here

Power wiring for TTSH rev.3



This page contains hi-res pictures of the build process. More will be added while build continues ...

shared by Björn Verbruggen and me.


for more details click on the picture, please respect the copyright - please ask before share on other websites, for private usage only.

Unpopulated PCB Pictures

(download the picture and open it local)

PSU

 

You should bridge the connections for the choke, and reverse the dc in connector. (notice this is another connector, not the one stated in the BOM)

Mainboard

Preamplifier/ Ringmod

VCO-1

VCO-2

VCO-3

VCO4027

VCF/Mixer

ADSR/AR

VCA

Mixer

Reverb

Amplifiers

 

S/H


Voltage Processor

Noise

Filtercards

4012 Filter

 

Notice the LM301 is soldered directly to the pcb. However you should use IC sockets.

There are 2 things to keep in mind:

  • The BC558B needs to be mounted backwards (flat side of the transistor faces round side of the pcb print):

  • You have to swap 2 pins of the 3958 - use insulation:


4072 Filtercard






Synthcube left fullkits and partial kits


 BOM as Excellist:

 BOM-list-TTSH REV8-v1.3.xlsx   (the lists includes all parts. (update 18.january 2017 approved section added)


The shared mouser basket from thehumancomparator is wrong (22.Dec.2016)
(this Mouser basket was provided in the 'order' eMail)


https://www.mouser.de/ProjectManager/ProjectDetail.aspx?AccessID=234c0 9ed60   old  link from Jon

http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=6CEDD31990  new Mouser link from me, improved see notice field for quantity "order 10"   →>> updated on 30 Aug.2018

order from other sources:

2N5460 x2

LM301 x34


(order the 100K resistors, 2N3906, 2N3904, 1N4148 from a local dealer to save money, make sure the 2N3904/2N3904 is from tape - for better transistor value matching.) but its still in the above mouser project

dont miss to order the parts for the gatebooster and ADSR mod (22uf, 2.2uF,220nF electrolyt, toggle switch SPDT)

ttshv2BOM.pdf (mainboard pcb)  - i update the list in next 2 days. (remove the above listed SMT chokes and replace with chokes from SecondFilter_BOM)

4027v2BOM.pdf (vco boards)

TTSHrev3_SecondFilter_BOMv1.1.pdf (filter board)  please use matched pairs 4 pairs of 2N5087 and only matched pairs for 2N3906/2N3904 (exept the single trannys)


for the rare parts, please check thonk.co.uk or my own page ( i offer 2N5087 matched pairs too)

if you need matched pair trannys or single tested trannys like 2N3954/8 or others, please contact me.

further i offer a survival kit


dont miss to order (if you only use the mouser basket)

Speakers: Visaton SC8 (reichelt.de, tme.eu)

reverb tank https://www.banzaimusic.com/Belton-RBL2AB3C1B.html  see known issues for wiring 

RCA/Chinch cable 0,5m - 1m (double or triple isolated/shielded otherwise you gets hum issues)

DC Powersupply  12V DC/1,5A - 24V/1A DC works, middle pin is + (5,5mm/2,1mm size)

Cable for Power wiring and Speaker wiring (1mm² diameter for power, 0,5mm² for speaker)

13 x 12mm Spacer M3, black flat Screws for frontpanel, screws for speaker at the rear and spacermounting, washers, nuts, cable shrink, silicon for matched pairs or glue the trannys together

1 x 10mm spacer + washer for filtercard mounting (ignore the second hole for a spacer in VCF section)

 3x long spacers to mount the powersupply  (25mm-50mm preferred to minimize the risk of EMV issues )


as stated above, the project is NOT for beginners

nearly all professional builders have standard resistor and capacitor values at home (if the BOM miss a few standard parts like a 100K resistor)



 

use 3x 20k or 25k multiturn trimmer http://www.tme.eu/de/details/3339p-1-203lf/tht-potentiometer-mehrere-umdreh-516/bourns/ for V/OCT trimmer in the VCOs, this type works as a drop in replacement and gives you more room for a better calibration.

(there´s no need to mount it from the component pcb side as standard multiturn trimmer due to issues with the sizing behind the panel and pcb)

 

In TTSH V2 and V3, you can easily modify the LED system so as to trim the LEDs all the way of off. Replace the 3k3 resistor located next to the TL071 pads to a jumper.  Tested by fuzzbass - thank you.



  1. Major Bug: Description:  at the Frontpanel pcb side you find some "VIAs", at the VCO 3 section the jack S/H , VCO2 section the jack ADSR, VCA section the jack Ringmod, has a via with 15V, the metalframe of the jack are connected to ground and you run in a short between ground from the jack and 15V/-15V from the vias.

    check the pcb for VIAs before mounting the jacks. (the following jacks are known for this Bug) but you have to check all 86 jack positions.

    1. Audio input Ring Mod (norm: VCO2sine)
    2. FM input VCO2 (norm: ADSR)
    3. FM input VCO2 (norm: VCO1square)
    4. KBD CV input VCO3
    5. FM input VCO3 (norm: S&H)
    6. KBD CV input VCF
    7. FM input VCF (norm: ADSR)
    8. CLOCK jack in EG section
    9. GATE jack in EG section
    10. Audio input in VCA (norm: RingMod)
    11. Audio input in Final Mixer (norm: VCF) - signal trace runs under two corners

    Solution:  file down the jack at the position of the via (1mm is fine) or cut it down
     

  2. Improvement: Powersupply Board - turn the 2pol MTA156 header if needed - otherwise the power input cable is above the powersupply.   (tick) confirmed, its not in every use case needed

  3. Minor Bug:Main board – Missing trace from V- to header. (copyright of picture for thehumancomparator.net ) (tick) confirmed


  4. Minor Bug: 4072 VCF missing trace pin 4 on LM1458 to -14V (use shrink tube for isolation) (tick) confirmed


  5. Minor Bug: 4012 VCF Board — BC558 must be installed backwards, schematics show Ermitter to 23k2 resistor in rev.7.2 (v3) (tick) confirmed


  6. Minor Bug: for all 2N3958 and 2N3954 change 2 pins like this,  cross the both pins - use shrink tubing for one pin for isolation. (tick) confirmed


  7. Improvement for build: or the Filtercards use flat electrolyte capacitors, check the height of all parts - if needed use other headers, check this for both Filtercards before you solder the headers, if needed place the 47pf(50pf) MLCC capacitor (on the mainboard) on solderside of the pcb)
    on my first build i used a 10mm spacer but i prefer the usage of 12mm spacers,  (by usage of 2 spacers - its needed to cut on the VCF out jack at the bottom some metal and you need a flat screw,  in result one spacer is enough  (wink) )


  8. Minor Bug: by usage of the banzai reverb tank, run in the reverb tank a wire from ground to ground on the RCA connectors to ground output and input

  9. Minor Bug: turn 180degrees on the mainboard the 5pol MTA156 power header, otherwise the power cable is to the wrong side and maybe you run in trouble with your case/cabinet size.

    the picture shows the correct mounting:

  10. Minor Bug/improvement: use a BC337-16 instead 2N5172 in the noise section more Details here (you don't need further mods)


11. Medium bug - the Clock LED driver (BC337) becomes hot - affect the functionality in some cases.

change the LED driver resistor LED-R17 from 220R to 820R ( its located at the Solderside bottom right, near the Clock fader)

        

12. Minor Bug -  the RCA connectors silkscreen on Mainboard is labeled wrong,  turn Input and Output RCA connectors  (red and white or (black) in same color as your reverb RCA connector color.


thanks to Anthony A Flagg for sharing the BOM and quick build guide


V3 quick build bom.xlsx  (right click to save - otherwise it opens in a unusable window due to too much rows/fomat)

or click in the next screen on top right corner on the download/arrow icon


 

3 Comments

  1. David

    Dear DSL-man,
    Thanks so much for sharing the build guide, I couldn't find the known issues for v3 anywhere anymore. The only thing is: The 2n3958 and 2n3954's picture is a bit unclear and one link is dead. Is it pin 5/6 that needs to be switched in all of them like in one of the 2n3954's in V4? 

    thanks for the help
    David

    1. LED-man

      please look in the above Tabs of this page.

  2. David

    Thanks for the reply. The picture works again