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Old 9th November 2002, 03:04 AM   #1
jleaman is offline jleaman  Belgium
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Default Whats a good..

hell all i have completed my 2 little mosfet amps and they sound good. i perchased a new plitron transformer and caps. just need case now 9 external one is being built as we sleep and live : O ) now to my questio since i have a turn on thump i was wonderin what is a nice simple circut that will work on my 45 volt rails put both together and it is 90v im going to be using my murcury wetted realays that i got. im looking for some thing like 10 seconds or so. and immediat relay cancel after power is off.

any one help me : O ) some one
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Old 9th November 2002, 09:05 AM   #2
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Jason, have you done a search? This has been covered many times before.

But so as not to seem unhelpful, here is a link

http://sound.westhost.com/project33.htm
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Old 9th November 2002, 02:03 PM   #3
fcel is offline fcel  United States
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How about this? http://mitglied.lycos.de/Promitheus/...or_toroids.htm
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Old 9th November 2002, 04:44 PM   #4
jleaman is offline jleaman  Belgium
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humm still not what im looking for all i want is a relay on a 10sec timer no protection is needed for my amps. NONE!


im thinking about useing a 555 timer ic and make a small circuit for time on and no time off. when the power is turned of from psu relays kick out right away when amp is on 10seconds before speakers are applyed to audio out.

j' O : )
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Old 9th November 2002, 04:50 PM   #5
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If it's a simple solution you want, have you tried a thermistor to slow down the surge into your toroids?
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Old 9th November 2002, 05:21 PM   #6
jleaman is offline jleaman  Belgium
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this isnt in my aleph amps just in my class a-b amps that i built and no matter how slow you bring up the power there is still a small pop i would like to get rid of it though with the relay

i bought 2 murcury wetted relays for this reason eheh
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Old 9th November 2002, 05:56 PM   #7
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JasonL,
I've got a schematic for a simple anti-thump relay circuit on my webpage (look right at the bottom of the page):
http://www.apcl43.dsl.pipex.com/proj_subamp.htm

You can increase the value of R7 (or C2) if you want the delay to be longer.

Nice one,
David.
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