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RE: Very accurate MC phono preamp on proto-board

The chip on board, the OPA 2134, can work down to +\- 2.5V. The LED draws 200uA. It has a 100K limiting resistor. I generally change batteries when supply is down to 21V. A 9V battery is considered flat at 7V.

I have built a number of headphone amps with same chip which runs successfully on one 9V battery.
| retro-thermionic |


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