Transformerless Feedforward Vari-Mu

[Heikki]

Those 2.5 - 6 -1.2s might be dual time constants like release time position 5 & 6 in Fairchild 660 viewtopic.php?p=37#p37

[Script]

That makes sense.

[Script]

The Recom R12-150B is mighty in price. Is there a cheaper alternative you can recommend?

Or a power toroidal backwards also could work, no?

[Heikki]

There are no cheaper alternatives for Recom R12-150B as far as I know. Since the whole thing is powered by 15V DC wall wart you can't use a transformer. You could use a linear power supply and a custom power transformer but it might not be cheaper.

[Script]

What meter is good on this? 200mA? 1mA?

[Heikki]

200 uA meter should be used. LED D7 is also gain reduction indicator. If I were to build another one I would just wire LED D7 to front panel and leave out the meter.

[Script]

I like that idea. Did something like that on analag's DAOC with LED in antiparallel to optocell . But ended up also adding meter slowed down with a cap to show an approximation of average.