OP213 is just a reference for an op amp, I can find a better one with respect to consumption.
Ok, but what to use instead ? A single BAT-42 diode just like for the Vcc storage ? Or a bridge made out of low forward voltage diodes ? I went the "op amp" way as someone suggested that diodes would not behave properly with low voltages like that.
Yeah, it would ;-) After all, I know I could use a mechanical switch just to do all this.
Thanks for the help.
I read in sci.electronics.design that Jonathan Westhues wrote (in ) about 'Line powered audio switch, getting there it seems', on Thu, 28 Apr 2005:
It's not a good choice. A TL062 might well be better, but there are several even more economical.
-- Regards, John Woodgate, OOO - Own Opinions Only. There are two sides to every question, except \'What is a Moebius strip?\' http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
I read in sci.electronics.design that Pooh Bear wrote (in ) about 'Line powered audio switch, getting there it seems', on Fri, 29 Apr 2005:
You have not taken the * energy storage* into account. 1 mW for 1000 seconds is 1 joule. Discharge 1 joule in 1 second and you have 1 watt.
-- Regards, John Woodgate, OOO - Own Opinions Only. There are two sides to every question, except \'What is a Moebius strip?\' http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
And what about those
Latching relay?
SMoE. ;-)
-- Keith
Ok, something like the LMV301,
Actually, I had considered it. To make use of the energy storage effect you'd have to use one of those clever relays that only needs to be pulsed to change state.
Anyone recall if they have a specific name ?
You've still got a problem with the op-amp consuming > 1mW. Even the low power types I know of can't do that.
Graham
I read in sci.electronics.design that Pooh Bear wrote (in ) about 'Line powered audio switch, getting there it seems', on Fri, 29 Apr 2005:
That's what the OP has.
Trace the thread back.
The op-amps run from the energy stored in the filter cap of the half-wave rectifier. That's there all the time the audio is present, after the initial charging period.
-- Regards, John Woodgate, OOO - Own Opinions Only. There are two sides to every question, except \'What is a Moebius strip?\' http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
Latching, it's indicated beneath it ;-)
Actually, I was thinking, how could the C1 capacitor charge up if the OpAmp is already pumping current? Wouldn't it be better to add a 5.6V Zener diode in series opposition at the exit of C1? This way, if I'm correct, Vcc will only go from 0 to +5v (approx), when the capacitor is charged enough. Hum... That puts the risk of turning off the whole supply. I'm reaching the limits of my low-power knowledge here. Could anyone help out? Rest assured that I very much appreciate all the help I've gotten so far.
Cheers Olivier
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