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read low voltage AC

 
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carlosma



Joined: 24 Mar 2004
Posts: 53
Location: Portugal

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read low voltage AC
PostPosted: Fri Feb 04, 2005 6:09 pm     Reply with quote
Hello:
I would like to measure the AC voltage 16mV AC to 2V AC with ADC of 16F876.
Any idea to convert this low voltage of 16mVAC to a DC and now read with ADC.
This is to read a TI transformer.

Thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Feb 05, 2005 4:29 am     Reply with quote
Look at Opamp circuits for a "precision rectifier".
bkamen



Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA

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PostPosted: Sun Feb 06, 2005 3:23 pm     Reply with quote
PCM programmer wrote:
Look at Opamp circuits for a "precision rectifier".


Ya, what PCM said.

The LM124/324 Datasheets from National Semi have a few examples of rectifiers with op-amps.
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