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I put one of these together, and I also found some discrepencies, but
nothing that prevented me from getting it working correctly. I believe
you should have a high frequency clock being fed into U3 and on the
output, but the associated diodes/cap on the output should be
rectifying/smoothing this into DC. Check the signal input to U2 and
see what you have there. Maybe check the polarities on your diodes,
D2, D1?<br>
<br>
Dave<br>
<br>
Schierl, Dan wrote:
<blockquote
cite="mid83B691DE781219499913FBA1AD35B8A53DCED0@email.msoe.edu"
type="cite">
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<div><font color="#000000" face="Arial" size="2">hi list--</font></div>
<div><font face="Arial" size="2">has anybody had any experience with
TomG's keyboard converter, the kbd2e? I recently put one of these
together, and am getting some strange results. </font></div>
<div> </div>
<div><font face="Arial" size="2">documentation is here:</font></div>
<div><a href="http://www.ele4music.com/pdfs/kbd2e.pdf">http://www.ele4music.com/pdfs/kbd2e.pdf</a></div>
<div> </div>
<div>I noticed 4 or 5 discrepancies between the schematic and the
pcb, and i believe I have corrected these. also, i noticed 2
discrepancies between the parts list and the schematic, and I think I
got those right as well. the pitch CV out seems to be working fine, but
the Gate out is acting weird--with key up I see about 14 volts, and
with key down I'm getting a ~4volt p-p square wave centered around 12v,
and from what i can see it has a frequency of around 50 KHz. tracing
back a bit i'm reading a 30V p-p square wave on pin 5 of U3 (a 13600)
at the same frequency.</div>
<div> </div>
<div>any thoughts as to what i should check next?</div>
</blockquote>
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