Buchla 258 adaptation functional

[mark verbos]

the pc board files are now online.
http://www.simple-answer.com/DIY.html



mark verbos wrote:

> I have completed a working version of the oscillator we have been discussing.
> I took the Buchla 258 and changed the descrete OTA, that used a rare matched
> pair, to a 3080. the fet source follower and transistor inverter to an opamp
> buffer. Of course I had to use the PNP exponential converter because of the
> 3080. I used only 3904 and 3906 transistors and 3819 FETS. 4148 diodes.
> SO..... no hard to find parts.
>
> There were some problems with my board layout so i will edit that today and
> make it available to anyone who wants to build it.
>
> NOTE: the saw wave is not really very nice looking but the sine is real clean.
> from voltage you can sweep from sine to "saw" or you can configure it with a
> few resistor changes to sweep from sine to square. This sweep is kinda like a
> lowpass filter sweep but unlike any filter I have heard. This will be a single
> space FracRack panel with board mounted pots.
>
> thanks for the help, even though the problem was the scope. ;)
>
> mark
>