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Old 27th June 2014, 10:48 AM   #1
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Default Nad 214 muting circuit

Hallo all,
I have got a problem with a Nad214 amp. My problem seems to be C222 or C223 in the muting circuit. The current electro caps are 0.47uf 100v and my problem is that I struggle to find them in 100v package. Can I connect two 1uf 63v caps in series to replace the 100v caps ? Is it really necessary for 100v caps, as the rail voltage looks like 52vdc ?
Nad relay.PNG
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Old 21st July 2014, 06:10 PM   #2
Kay is offline Kay  Germany
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if you like to use a caps like MKS or MKT with 63Vdc,
I see no problem
but
"two 1uf 63v caps in series to replace the 100v caps" it's o.k. too
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Old 21st July 2014, 06:27 PM   #3
Mooly is offline Mooly  United Kingdom
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C222 can see the full supply (104v ?) if the lower transistor is on. So a 100 volt cap seems too low here. The other one, I'm not sure what voltage swing that might see as its determined by the internals of the IC to some extent.
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Old 21st July 2014, 06:32 PM   #4
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Mooly View Post
C222 can see the full supply (104v ?) if the lower transistor is on. So a 100 volt cap seems too low here. The other one, I'm not sure what voltage swing that might see as its determined by the internals of the IC to some extent.
Is that line zero volts that the emitter goes to. If so then disregard what I said over the voltage rating and yes, 63 volt is OK
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Old 26th July 2014, 11:46 PM   #5
Kay is offline Kay  Germany
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"Is that line zero volts that the emitter goes to"

yes
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Old 27th July 2014, 06:20 AM   #6
Mooly is offline Mooly  United Kingdom
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Thanks, so the 63 volt rating as you mentioned earlier is OK. It was me reading the circuit wrong at a quick glance.
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