Negative voltage from positive 555 Verified

144

03:17:19

I have a digital Piano in for repair and the -5v rail is not working right, it is a complex circuit because the Piano is powered from a +15v adaptor (see my other circuit). I plan to eliminate the original circuit and use this one - The load is two smd op amps (2x5.7mA) so this circuit should provide up to 50mA, sufficient current for these Op Amps.
Tested the circuit today and can verify that it really works. If you want 3.3v just change top divider resistor and lower the supply to 9v.

published 9 years ago

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