[sdiy] Powering ICs from a Voltage Divider

[Justin Owen]

Hello,

I have a circuit powered by an LM713 VReg, outputting 12V DC. I have an optocoupler (6N138) that wants 5V VCC and a DAC (TLV5168) that I'm (probably) going to power from 3V VCC.

Is there any reason why I shouldn't run two separate two resistor/voltage dividers from the 713, buffer each of them with an op-amp and power the chips off of that?

Thanks

J