| Panel |
|---|
| borderColor | #000000 |
|---|
| bgColor | #f0f0f0 |
|---|
| titleColor | #FFFFFF |
|---|
| titleBGColor | #A9BCF5 |
|---|
| title | Project |
|---|
|
Projecttitel: Fonik VCO 555 Thomas HenryStatus: Startdate: 2012Duedate: 09/2014 |
BUILDING NOTES
1)
in the original schematic of the VCO frmo thomas henry we three times a resistor R26, whereas R25 is missing completely.
so here are the values corresponding to the PCB labeling that are not covered correctly by the schematic/parts list:
R25 - 300k
R26 - 39k
R55 - 5.6k
2)
when powering from 12V lower R27 to 33k (otherwise you will not be able to get a decent level for your sine wave)
3)
when you have a hard time finding a precision trimmer wit 25k, just use 50k. does the job as well.
4)
C4 is the timing cap. use a nice C0G/NP0 or a mica for better stability.