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Old 17th January 2009, 08:04 PM   #1
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Default DC protector ??

I am looking for a schématic dc protector

thank you
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Old 17th January 2009, 10:41 PM   #2
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I don't suppose you would settle for a nice coupling capacitor...

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Old 18th January 2009, 08:39 AM   #3
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Default I have one (it designed and configured for Aleph 4.0).

See attached schematics.

- R19 represent 24V (DC) relay resistance. C1 is bipolar capacitor or you can use two electrolytic 100u capacitors connected in series (plus poles are connected together and one minus pole is connected to GND, secon is connected to R1).
SW-SPST1 is switch (you can omit it)

Here is my thread:
PassLabs Aleph 4.0

Here you can found complex schematics and pictures:
http://www.facebook.com/album.php?ai...&id=1386409150
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File Type: jpg dc-detect_simulation.jpg (89.9 KB, 350 views)
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Old 18th January 2009, 08:50 AM   #4
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This picture is coming from simulation in Tina. There is limited components library. You ca use another types of zenner diodes.

Also this is DC protection only and doesn't offer delayed speakers ON. If you want this function check my schematics on facebook.

Tomas
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Old 18th January 2009, 09:10 AM   #5
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You dont have protection in Aleph ?
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Old 18th January 2009, 09:11 AM   #6
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I guess that this question is pointed to Nelson... :-).
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Old 18th January 2009, 09:13 AM   #7
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Thank you.
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Old 18th January 2009, 09:30 AM   #8
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What is the function opt1 ?
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Old 18th January 2009, 10:30 AM   #9
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Cool My DC protection circuit topology - explanation

Quote:
Originally posted by ping_31140
What is the function opt1 ?

OPT1 electrically isolate audio circuit from soft start circuit and AC detect output from power supply. I used it to prevent ground loops and make thinks easier. DC protection circuit is controlled over this OPT1 by two signals:

AC Detect ¨C this signal is rectified output from both transformer secondary windings. This signal make immediately speakers OFF when amplifier is switched OFF, main fuse is blow, power supply failure on primary site...

Output Delay control ¨C this signal is generated by timing circuit on soft start board. Timing circuit generates amplifier boot (switch ON) sequence: power switch ON ¡ú soft start 10 s ¡ú delayed speakers ON 20 s (timing circuit uses 50Hz frequency from mains; if frequency is 60Hz timing will be shorter with same ratio)

Switch OFF sequence is partially generated by power supply and DC protection circuit topology....:AC detect falls down=switch OFF speakers, then C18 discharge=switch OFF power supply...

Hopefully I explained it clearly :-)
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Old 18th January 2009, 10:34 AM   #10
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this web replaced some characters in my text by mishmash
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