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Old 25th November 2004, 02:26 AM   #1
s2kov is offline s2kov  Canada
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How much capacitance is allowed to use for amp's switch to eliminate speaker thump? Would 1uF is ok?
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Old 25th November 2004, 02:54 AM   #2
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I usually use about .047uf across the power switch,and it works alright for me. 1uf seems a bit big to me..
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Old 25th November 2004, 01:02 PM   #3
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Seconded.

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Old 25th November 2004, 04:11 PM   #4
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Or even a 10nF 1-2kV works well also. Mainly to prevent the switch contacts from arcing or welding together. I've often seen a 130R resistor and a 10nf-22nf cap in series in a little package mounted across the mains sw. I think the ones I've seen were manufactured by NCC, who-ever they are. Nippon Chemical or Condenser Corporation/Company? Having a cap across the mains sw also allows a small amount of current to pass when the switch is in the off position, so you don't want a too big of a cap!
I've seen in some of the older tube amps from long ago that had a 47nF cap across the pwr tranny primary. And sometimes a resistor, 2.2meg carbon composition and/or a cap 47nF from one side of power cord to chassis ground. This was back in the days (here in US) when they used mostly two conductor, nonpolarized power cords, though one side of the zip cord insulation was sometimes ribbed. In modern equipment that have a polarized power cord that 2.2meg resistor is usauly found on the wide blade-white stripe-ribbed (neutral) side, along with a noise filter (VCR's and TV's etc.).

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Old 25th November 2004, 04:21 PM   #5
djQUAN is offline djQUAN  Philippines
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for a cheap solution, I used those HV ceramic caps from PC PSU's (blue ones, about 2.2nF) and connected across the mains switch. works well for a guitar amp.
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Old 26th November 2004, 02:33 AM   #6
garbage is offline garbage  Singapore
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Quote:
Originally posted by cogsncogs
Mainly to prevent the switch contacts from arcing or welding together.
hi cogsncogs, wanted to know if this(cap across switch) is recommended if i have a switch on HT side for delayed B+ switching?

schematic below, switch at 480-0-480 side:
Click the image to open in full size.

thanks.
garbage
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Old 26th November 2004, 04:29 AM   #7
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Ya.

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Old 26th November 2004, 05:43 AM   #8
garbage is offline garbage  Singapore
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okie. so i can put the cap across G1/G2?
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Old 26th November 2004, 07:37 AM   #9
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Hi,

Quote:
okie. so i can put the cap across G1/G2?
Ya.Ya.

Cheers,
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Old 26th November 2004, 07:38 AM   #10
garbage is offline garbage  Singapore
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okie okie.
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