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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

muting circuit to eliminate turn-on thump
muting circuit to eliminate turn-on thump
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Old 9th January 2019, 11:12 PM   #11
Halauhula is offline Halauhula  United States
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Whatever it takes! Go for it!
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Old 10th January 2019, 10:24 AM   #12
druidaudio is offline druidaudio  Wales
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muting circuit to eliminate turn-on thump
I have previously used a 555 timer for this purpose
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Old 11th January 2019, 09:17 PM   #13
jev is offline jev  Netherlands
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Join Date: Jan 2005
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Hope there is no copyright but i always use this circuit. Takes some tweaking of the resistor values for lower voltage. I now use this also with a 5V relay for like 20 seconds delay

Alos i have some Ebay sourced 555 based prints but have only tested these. Work fine on 12V but are single channel
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File Type: pdf circuit.pdf (282.5 KB, 31 views)
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Old 11th January 2019, 10:26 PM   #14
keilau is offline keilau  United States
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Join Date: Mar 2013
Location: Windy City, US
Quote:
Originally Posted by druidaudio View Post
I have previously used a 555 timer for this purpose
Quote:
Originally Posted by jev View Post
Hope there is no copyright but i always use this circuit. Takes some tweaking of the resistor values for lower voltage. I now use this also with a 5V relay for like 20 seconds delay

Alos i have some Ebay sourced 555 based prints but have only tested these. Work fine on 12V but are single channel
I have fond memory of building 555 based delay turn-on published on The Audio Amateur (now AudioXpress) for my baby Ampzilla clone. It worked well in the 1970's. But now buying a UPC1237 based protection board on e-bay is cheaper and easier to manage. Functionally, they are all the same.
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Old 12th January 2019, 08:39 AM   #15
jev is offline jev  Netherlands
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Join Date: Jan 2005
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Originally Posted by Bare View Post
Could? also find a Pre that Does Not have a turn on thump problem?
IMO output trafo coupled pre amp does not have this problem
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