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 Forum index » DIY Hardware and Software
Hearn Morley VCO-1 How to get 1v/Octave scaling with +/-12v?
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jackdamery



Joined: Apr 26, 2010
Posts: 72
Location: UK

PostPosted: Wed May 01, 2013 12:52 pm    Post subject: Hearn Morley VCO-1 How to get 1v/Octave scaling with +/-12v? Reply with quote  Mark this post and the followings unread

've built up the schematic according to the typical connection diagram(Running on +/-12V). I haven't connected pins 1, 2 or 12 as I just want to control frequency at the moment.

https://sites.google.com/site/hearnmorley/products/hmvco1b/HMVCO1cTypi calConnectionDiagram.pdf?attredirects=0&d=1


There doesn't seem to be any way to tune it to 1v/octave tuning. The scale pot only seems to make it go sharp or flat by a few cents.What can I change to get the v/octave scaling?At the moment the difference between 2v in and 3 volts is about a third of an octave in frequency.
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bod



Joined: Apr 28, 2009
Posts: 148
Location: Glasgow

PostPosted: Thu May 02, 2013 5:02 am    Post subject: Reply with quote  Mark this post and the followings unread

on the off chance that the unconnected pins are required to be connected in order to satisfy the circuitry inside, i'd try connecting them as per the diagrams and see if that helps before anything else.
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jackdamery



Joined: Apr 26, 2010
Posts: 72
Location: UK

PostPosted: Thu May 02, 2013 6:02 am    Post subject: Reply with quote  Mark this post and the followings unread

What could I connect them to though? Apart from the triangle shaper they are all inputs.
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bod



Joined: Apr 28, 2009
Posts: 148
Location: Glasgow

PostPosted: Thu May 02, 2013 6:50 am    Post subject: Reply with quote  Mark this post and the followings unread

This is true, and whilst it's doubtful the resistor and cap on the linear cv will make any difference, it maybe worth trying. Are you absolutely sure everything else is connected properly?
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