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In Reply to: RE: Very accurate MC phono preamp on proto-board posted by A.Wayne on May 21, 2015 at 08:57:11:
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.
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Follow Ups
- RE: Very accurate MC phono preamp on proto-board - mwhouston 15:47:18 05/21/15 (4)
- RE: Very accurate MC phono preamp on proto-board - A.Wayne 16:00:36 05/21/15 (3)
- RE: Very accurate MC phono preamp on proto-board - mwhouston 16:22:13 05/21/15 (2)
- RE: Very accurate MC phono preamp on proto-board - A.Wayne 16:34:14 05/21/15 (1)
- RE: Very accurate MC phono preamp on proto-board - mwhouston 16:39:56 05/21/15 (0)