Will putting 28v through my breadboard cause issues w/ my other circuit

blocco a spirale

Joined Jun 18, 2008
That should be ok but pay attention to the layout of the power-supply lines so that devices that require relatively high currents (or reactive devices such as relays) don't disturb the power supplies of any sensitive electronics.

28V is not particularly high, many op-amp circuits may require 30V (+15V, -15V).
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