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Old 25th September 2003, 01:30 PM   #1
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Lightbulb Another simple DC protection

Hi all,

just read an article in a magazine about a simple DC protection...
it looks like in the picture.
any comments welcome...

Best regards,

HB.
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Old 25th September 2003, 01:39 PM   #2
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Just too simple

What is there to stop it "Protecting" on legitimate AC Audio Signals
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Old 25th September 2003, 01:43 PM   #3
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hb...... optocouplers are used for isolation from the load and its a common practice in alot of designs
I use triac output devices for switching line voltage all the time to separate small signal devices from the load


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Old 25th September 2003, 01:43 PM   #4
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oooops a 'not shown' cap across the inputs of the rectifier...
it must be a LPF doh!!!
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Old 25th September 2003, 01:45 PM   #5
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what about using an opamp integrator?

or maybe a 555?
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Old 25th September 2003, 02:41 PM   #6
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I think it is not better than the ordinary circuit.

because it's point of protect voltage is higher.
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Old 25th September 2003, 03:18 PM   #7
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Quote:
Originally posted by X.G.
I think it is not better than the ordinary circuit.

I don't think the original circuitry will work as it will act on high a/c signals as well.
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Old 25th September 2003, 03:48 PM   #8
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Quote:
Originally posted by millwood
I don't think the original circuitry will work as it will act on high a/c signals as well.
I agree with you for a/c signals.

but in my experience,the PHOTO device work in several milliamperes.so i think above.
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Old 28th September 2003, 09:32 AM   #9
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And I though the AC music signal will be rectified to DC and the opto-isolator will trip...causing the relay to cut off...so izzit a protector??
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Old 28th September 2003, 12:52 PM   #10
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As drawn this circuit will trigger for any dc or ac level that
exceeds +/- 2.1 volts with a time constant based on the
1k and 100uf cap.
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