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Projecttitel: Fonik VCO 555 Thomas HenryStatus:--
Startdate: 2012Duedate:201309/2014Manufacture link: http://www.muffwiggler.com/forum/viewtopic.php?t=73329&start=650 |
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:
R13 = 2k
R27 = 22k
R33 = 137k
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.
have to build again this VCO.
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