[sdiy] +7 and + 2 volt supply

[rsdio at audiobanshee.com]

Hmm, does the pedal also use the +7 V and/or +5 V regulated voltages?

A +2 V supply might create some euphonic distortion from certain op-amps, but I wouldn’t expect the entire circuit to operate very well on +2 V only. Were these Roland distortion pedals?

Brian


On Jun 9, 2019, at 7:10 PM, Adam Inglis <21pointy at tpg.com.au> wrote:
> In another thread I mention a bunch of Roland/Boss delay boxes I’m looking at.
> Most of these take the usual Boss 9 volt supply and regulate it with a 78L05 giving a +5 to zero volt supply.
> However, in one of these machines, which uses much the same circuitry as the others (the RSD-10) and the same 9 volt DC adapter, Roland have used a 78L07 next to a 79L05 to give a +7 v to +2 v supply.
> 
> Anyone care to hazard a guess as to why?