Re: Rectifier-LP filter circuit



Spehro Pefhany wrote:
Hi, I'm analyzing a circuit (which I didn't design). It's part of a
meter that outputs a DC voltage related to a 1kHz fairly low-level
square-wave signal. Supply is +/-8 regulated. The JFET op-amps can handle +/-30V differential input voltage (provided the inputs don't go below the negative rail in particular).

http://server2.hostingplex.com/~zstoretr/meter.gif

This circuit is a little different from what I'm used to using for the
precision rectification/LPF stages. C7 is polarized, minus on top,
BTW.

Can anyone see a good reason for D3? (or R13 for that matter, other
than to increase the noise)?

Thanks!


Best regards, Spehro Pefhany

It's not a rectifier, it's an inverting positive peak detector with gain of 12.1.

.

Loading