[sdiy] Operating voltages questions about synthesizers

cheater cheater cheater00social at gmail.com
Mon Sep 5 11:02:48 CEST 2022

Looking at the schematic, this thing has a bunch of op amps, figure
out what they are, but in general op amps will definitely sound
clearer with higher voltage rails (within acceptable limit). Whether
clearer is better is up to you to decide.

BTW please delete the xs4all email address for synth-diy from your
address book - when you send an email like this to both the old email
address (long gone) and the new email address (which we are talking
through right now), it all gets forwarded by mailman, so anyone who
replies to all recipients (the default in mail clients) gets an
account not found notification.

On Mon, Sep 5, 2022 at 10:59 AM cheater cheater
<cheater00social at gmail.com> wrote:
> A lot of analog chips have a range of voltages they can work off of.
> They can work at 12V, 15V, 9V, 5V... depending on what you have
> available. Usually they work the best at the maximum rails voltage.
> The best meaning: less through-zero noise, less self-noise, more
> linearity, better current output (= better at reproducing bass
> frequencies), etc. You don't want to burn the circuits out, though.
> Chips in the circuit might be limited to say 14V, so if you plug in
> 16V, that'll be too much and something might get damaged. On the other
> hand, thermal considerations are also a thing. If a circuit was built
> for 9V, it might have components meant for the specific power
> dissipation that it'll do when supplied with 9V. At 12V it might
> dissipate more power, slowly burning out chips or resistors or
> capacitors. You want to look into that. The best you can do in this
> case, for an old mass produced circuit like that, is to find a group
> of users focused around this item, and ask them if anyone uses higher
> voltage power supply units, and how that fared over the years. Maybe
> you can find a tech who specializes in those, and can politely ask
> them without wasting too much of their time.
> On Mon, Sep 5, 2022 at 9:37 AM Logan Mitchell Sr via Synth-diy
> <synth-diy at synth-diy.org> wrote:
> >
> > I am finally working on completing modifying my Electro-Harmonix EH 0400 mini synthesizer that I purchased brand new around 1979/1980.
> >
> > Its original factory power supply was two 9-volt batteries connected in parallel with no external power supply adapter jack installed so I installed one some years ago to use a 9 volt DC power supply.
> >
> > Last night I connected a 12 volt DC power supply & noticed that the synthesizer sounded a little better than when operating from the 9 volt battery or from the 9 volt DC power supply.
> >
> > I'm thinking about adding a 7812 or 7815 voltage regulator circuit to connect to the power connection of this synthesizer since I have some 18 volts DC power supplies (wall warts) that I've used on some other electronic music devices.
> >
> > My question is this - does an electronic music circuit that works fine from a 9 volt DC supply work even better at 12 or 15 volts DC & why is that so ?
> >
> > Logan
> >
> >
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