12 or 15 V pwr

[tim0 [Timo Christ]]

Hello DIY,

i will build a 12 V power supply for my upcoming modular, and i would
like to be able to add 15v modules to it. 
i know some modules can run on anything (for example my env.
generators), but could i for example run a Formant module, or an ASM-1
with 12 V ?

the best would be a 12V and 15 V power supply, of course, but i haven╢t
seen that with only one transformer yet.

please inform  :-) 
T.C.
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