OP AMP rail splitter

372

04:11:30

Single OP AMP rail splitter +-14V. Powered by 18650 3.7V battery, boosted by MT3608 buck boost module to its max. about 28 volts and then splitted  by one op amp to create asymmetric mini power supply for desktop testing of audio op amp circuits. I used second half of the IC as well to improve current capabilities of the circuit. In that case you need to use small output resistors to compensate outputs issue caused by tolerances in inner circuitry of both op amps. Output ripple caused by MT3608 was slightly under 40mV with only 10uF filtrating capacitors (measured by oscilloscope). Use whatever capacity suits you. As OP AMP I used old LM 1458 but any other would do (LM 258, 358, TL072). The higher sink and source output of the op amp, the better. Do not use comparators! And of course the “new” ground is between filtrating capacitors.
Despite current limitations the power supply is more than sufficient for the purpose since OP AMPS use in average only a few mA.

published 5 years ago

PrathikP

5 years ago

You can improve the current capabilities of an op amp rail splitter in this manner http://everycircuit.com/circuit/5394964266352640

PrathikP

5 years ago

This one has current limiting http://everycircuit.com/circuit/4659192062017536

PrathikP

5 years ago

And this is a rail-to-rail version http://everycircuit.com/circuit/4921618462408704

petokato

5 years ago

The first circuit is private or deleted so I can't see it. The other two are more complex thus complicated. I try to build circuits based on simplicity and efficiency. As mentioned above this is desktop power supply for op amps testing in audio circuits. it's very small and portable and suffice for the purpose. But I am open to improvements while keeping circuit as simple as possible.

PrathikP

5 years ago

Oh sorry I'll link it back

PrathikP

5 years ago

http://everycircuit.com/circuit/4626247261618176 here you go. I accedentally deleted it. This is a simple version.

petokato

5 years ago

Actually the simple version was the most useful to me. I doubt I ever need that much power though. Thanks anyway

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