Electronics > Projects, Designs, and Technical Stuff

TO220 rail splitter?

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0xdeadbeef:
I recently stumbled over a Chinese dual voltage module on eBay (see attached picture) that seems to consist only of a cheap boost converter (LM2577 clone), some capacitors and a five pin TO220.
As it claims to create a dual voltage output (with up to 3A), I guess this TO220 must be a rail splitter. Like a beefy version of the TLE2426 which would be very handy for rail splitters demanding more than 80mA.
So is there such a thing?

capt bullshot:
I'd guess it's a power OpAmp. One can buy them in said 5 pin TO220 and make a rail splitter out of them using two additional resistors.

0xdeadbeef:
As far as I can tell, there is only one resistor on the PCB and that is used for the LED.

Zero999:

--- Quote from: 0xdeadbeef on December 18, 2018, 08:55:51 am ---As far as I can tell, there is only one resistor on the PCB and that is used for the LED.

--- End quote ---
There's only one through hole resistor, but there appears to be many surface mount resistors on that PCB.

0xdeadbeef:
Ah, crap. While there are no SMD resistors on the top (of the main PCB), there are indeed four resistors (3x10k, 1x1k) on the bottom.
So yeah, it's probably really an OpAmp.

[EDIT]
Indeed the "typical application - split supply" circuit in the LM675 datasheet shows a circuit with four resistors (well actually five, but let's ignore the 1Ohm resistor).

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