[sdiy] Trouble shooting the PV-1 pitch to voltage converter

[Joe Frey]

Simon, Thanks! Well, at very least you helped me feel like I might get 
this going with help from bigger brains than mine.
   As cheater00 pointed out, I didn't state how it wasn't working. I 
only get a steady 5.3V at pad 4(Pitch CV). It does not change.

> apply +12 V to PAD7, I wonder if the voltage on U04 pin 1 goes to 
> around 0V (I think it should). If it does, leave PAD7 open again for 
> the next check,
I did this and pin 1 of U04 went to 0V!

> - if you apply a continuous input signal, do you see the DC voltage 
> (as measured with a multimeter) of U04 pin 1 go down from the 11.4V 
> that it is without input signal? Does it come closer to 0V at higher 
> frequencies of the input signal?
Yes. U04 pin 1 I get .004-7.0 volts with the smaller values at higher 
frequencies.

Thanks. Again. Can you tell me where to look next? Joe.












Simon Brouwer wrote:
> Hi All,
>
> Apparently the gate signal is stuck to "on". I don't understand how 
> this part of the circuit is supposed to work, how can the gate signal 
> ever go off if there is no input signal? Since in that case U07B is 
> not getting clocked and will not change its output state...
>
> And Joe,
>
> For some first checks,
>
> - apply +12 V to PAD7, I wonder if the voltage on U04 pin 1 goes to 
> around 0V (I think it should). If it does, leave PAD7 open again for 
> the next check,
>
> - if you apply a continuous input signal, do you see the DC voltage 
> (as measured with a multimeter) of U04 pin 1 go down from the 11.4V 
> that it is without input signal? Does it come closer to 0V at higher 
> frequencies of the input signal?
>
> Best regards
> Simon
>
>
>
>
> Joe Frey schreef op 27-7-2014 19:00:
>> The PV-1 is a pitch to voltage converter designed by Harry Bissel and I
>> know of one person that uses it.
>> Needless to say mine doesn't work and I'm stuck. I have added a link for
>> the original project pdf that has the schematic. There is a link to a
>> pdf of my project with voltages listed for ICs, transistors and diodes.
>> There are links to a photo of the top and bottom of the board I made and
>> populated, Any help would be much appreciated.
>>
>> http://www.radioles.com/works/pv1_611-1.pdf
>>
>> http://www.radioles.com/works/PV-1%20trouble%20shooting.pdf
>>
>> http://www.radioles.com/works/IMG_20140724_230152028.jpg
>>
>> http://www.radioles.com/works/IMG_20140724_230201823.jpg
>>
>
>


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Joe Frey
A.K.A. Bitter Relic of a Bygone Era
joe.frey at radioles.com
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