[sdiy] AS3394E: Practical power supply?

[Benjamin Tremblay]

Thanks All!

I can’t get advice like this anywhere else. Only other lazy impulse left in me is: I might actually have some 7906 regulators in a bin. Maybe good enough?

> On Nov 19, 2021, at 5:59 AM, The SynthiMuse via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> I think adjusting the voltage on a 7905 with diodes in a non-critical supply is fine except it reminds me....  
> 
> As a 23 year old junior tech (1981), I got a gentle 'bollocking' for replacing a VCS3 -ve power regulator with a 7905 and a zener to bring it up to the right voltage.
> He told me that so much of the synth depended on good PSU regulation that doing this wouldn't give a solid enough rail for stable operation as the voltage could drift up and down with temperature.
> I learned my psu lesson.
> 
> So, overall,  an LM337-type solution is the one I would go for.
> 
> Gerry
> 
> 
> On Fri, 19 Nov 2021, 09:34 Gordonjcp, <gordonjcp at gjcp.net <mailto:gordonjcp at gjcp.net>> wrote:
> On Thu, Nov 18, 2021 at 03:49:00PM +0000, Tom Bugs via Synth-diy wrote:
> > necessary not to compromise the VCO frequency resolution, which ranges from
> > -4 to +4 volts, in favor of a -5V
> > supply (this is because there needs to be 4 diode drops for the current
> > mirrors).Any one of the readily
> > available 3-terminal regulators may be used to supply the -6.5V negative
> 
> So why not a cheap readily-available 7905 with two diodes in its ground leg?
> 
> -- 
> Gordonjcp
> 
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