Aleph P 1.7 output muting relay... - diyAudio
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Old 20th March 2002, 05:20 PM   #1
Freddie is offline Freddie  Sweden
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Default Aleph P 1.7 output muting relay...

I've read in the service manual that the output muting relay is controlled by the circuits of Q21 and Q22. But where is the output relay? I can't find it anywhere on the schematics, I can't find it on the component placement diagram either. I suppose it is directly after the 10uF caps, and simply shorts to ground so there are no turn on transients, am I right?

Thanks in advance

/Freddie
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Old 20th March 2002, 07:50 PM   #2
fcel is offline fcel  United States
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I don't mean to bug in here but has anybody installed/design a turn on muting circuit for BOSOZ? Nelson Pass has indicated in the BOSOZ article as a exercise for the reader.
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Old 20th March 2002, 11:52 PM   #3
Helix is offline Helix  United Kingdom
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i guess it justs attenuates the output to the full, by using it's volume control relays
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Old 9th April 2002, 12:55 AM   #4
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The mute relay runs off of the Mute + and Mute - coming from Q21 & Q22. Q21 switches on and off more or less instantly once the rail comes up or drops. Q22 provides the delay on turn-on via the cap at the gate. The relay itself is not shown (at least not on the power supply schematic with the rest of the circuit--I didn't bother looking for it elsewhere), but it's not too hard to hook up a relay to Q21 & 22, then apply ground to the outputs. The IRF610 and IRF9610 have sufficient current capability to drive any reasonable relay coil for this application.
The circuit tickles me, because it's such an elegant way to use up out-of-spec parts from the gain stages.

Grey
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Old 23rd October 2002, 02:43 PM   #5
Klaus is offline Klaus  Germany
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Default Voltage of mute relaiy?

Hi,

I do not understand all details of the voltage losses of this damned FETīs...

Could anyone please tell my the Voltage rating of the mute relay coil, thanks!

Klaus
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Old 23rd October 2002, 07:41 PM   #6
Jens is offline Jens  Germany
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I believe 48V types, but both output relays serial - like the input relays.

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