[sdiy] Moog minimoog osc board into module?

[harrybissell]

WeAreAs1 at aol.com wrote:   snipp'd inline

>  Maybe there are 7810 and 7910 10 volt regulators available that you can
> just strap accross your 15 volt rails to make these supplies.

Not usually, but the LM317 LM337 could be adjusted to +/-10V

> If not, there
> are tricks you can do with 9 volt regulators to make them act like 10 volt
> regulators (someone please step in and explain how this is done, please -- it's
> some kind of diode drop thing, I think).

Add a diode in series with the ground leg (Diode forward biased) and the voltage
goes up .7V    Still not 10V  (9.7 close enough ?)

> Those Q81 tempcos are pretty much the holy grail of tempco resistors, so you
> might consider trying to find another one to match the two good ones.  They're
> hard to find, but they are out there.  On the other hand, you could probably
> drop a modern tempco into the missing spot and calibrate the VCO's tracking to
> identically match that of the other two, so it's not a big issue.  You might
> consider putting the two Q81's on VCO 1 and 2, and the new tempco on VCO 3,
> since it's the one that's likely to be used (at least sometimes) as an LFO.

Hmmm nice idea.

> The most dramatic improvement you can make on those old Minimoog VCO boards
> is to replace all those crappy wirewound trimpots with modern multiturn
> trimmers (10 to 20 turns).  Trust me, it is well worth the expense and effort.  You
> will thank yourself every time you go to calibrate the scaling of the VCO's,
> which will be fairly often.  Multiturn trimmers make this a painless, if not
> downright pleasurable experience.  Those old WWII-era wirewound trimmers are
> almost impossible to physically adjust to where you want them.  Can I get a
> witness on this?

Amen. Witness testifies !!!

H^) harry