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 Forum index » DIY Hardware and Software » Thomas Henry designs
8038 VCO/LFO
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Starspawn



Joined: Jun 14, 2013
Posts: 69
Location: Oslo

PostPosted: Sat Jul 04, 2015 5:02 am    Post subject: 8038 VCO/LFO
Subject description: A small mashup.
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I was recently in need of a few VCO (got the CGS analog shift register) and as usual when I needed something good I can actually follow, my eye turned toward some Henry circuits.
Ill be getting more 555 pcbs later, but remembered I had some 8038 laying around ... and a little time later Id found the LFO from my 21. century book and the linear VCO posted here at some other time.

Wanting the v/oct control from the LFO, and both VCO and LFO range I just took the voltage input section from the LFO, kept the linear VCO main part (so no shaping or sync or any of the lovely LFO extras, I wanted a small board and panel) and added a switch for the range cap (4700pf or 1uf, but those can be tweaked, I got way more high pitch than needed on 4700pf).
If you calibrate first at a high pitch and then adjust the LF trimmer when going lower its stable at a good range.

It then looks like so and layout as follows.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Layout could be better, but I really wanted to mount the PCB to panel in a convenient way, so pots decided a lot.

So thanks for the schematics Thomas, as always Im impressed and thankfull that they are out there and that the designs are simple enough (in the words best sense) that I can follow them without disasters happening.
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