[sdiy] +7 and + 2 volt supply

[Adam Inglis]

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?