Standby

NHul · 11th March 2002, 09:07 AM

Hi

If I'm not wrong, Mr Pass "X" series amplifiers are all with standby approach. I'm not familiar with that kind of device. I tried to search for standby on the forum, but I could not find any threads relative to this.
Iwould like to know if anyone has same existing standby circuit.
Would it be possible to built someone, and put it in the Aleph series?

Thanks for any input,

NHul

leroy · 11th March 2002, 11:16 AM

I think the X-series use the same topology as Mark Levinson amplifiers. That means when you switch from 'on' to 'standby' the power stage is switched off while the pre-amplifier stage remains biased.

Nelson Pass · 11th March 2002, 05:44 PM

Please do not refer to the topology of X amps as
having any similarity to the Harmon products. I
have schematics of those, and no two types of
amplifiers could be more dissimilar.

The standby in the X amps leaves the supply charged,
but shuts down the bias and front end.

leroy · 12th March 2002, 11:31 AM

Is the reason of leaving the supply charged to prevent the capacitors getting deformed?

Nelson Pass · 12th March 2002, 06:55 PM

No, simply to avoid the monster inrush.

BrianGT · 14th March 2002, 04:49 AM

For standby mode, could you simply put a dual pole switch on the + and - voltage lines coming out of your capacitors?

Would that cause problems? Would a 20A switch be enough for this?

--
Brian

NHul · 14th March 2002, 09:27 AM

For shuts down this stage, where exactly in way of bias and frontend put the relays ?

NHul

leroy · 14th March 2002, 03:51 PM

Place a relay between the supply capacitors and the rest of the amplifier. Just make sure the supply for the relay coil is taken from the capacitors of before, otherwise you can switch your amp standby but can never turn it on anymore

Pboden · 6th October 2005, 07:38 PM

Quote:

Originally posted by BrianGT
For standby mode, could you simply put a dual pole switch on the + and - voltage lines coming out of your capacitors?

Would that cause problems? Would a 20A switch be enough for this?

--
Brian

I can't find an answer to Brians question regarding stanby mode on the Aleph. There shouldn't be a problem to place a switch between the capacitors and the main board?
That would stop the massive inrush to the transistors?

As a result, there would be no need for a soft start module, i.m.o.

Blues · 7th October 2005, 05:43 AM

Quote:

Originally posted by Pboden

I can't find an answer to Brians question regarding stanby mode on the Aleph. There shouldn't be a problem to place a switch between the capacitors and the main board?
That would stop the massive inrush to the transistors?

As a result, there would be no need for a soft start module, i.m.o.

Works like a charm on my Zv4 with 90mF/ch of caps. Requires a main power switch and On-On Standby/Play switch. The latter keeps the caps charged with a standby LED lit orange and in play mode turns blue and plays music. I also don't have to keep replacing 3A fuses every power-on. Initial power on (make sure PSU is ok) requires a bigger fuse. Let it soak for a few minutes then power off and change-out to specified fuse value

11th March 2002, 09:07 AM	#1
NHul diyAudio Member Join Date: Feb 2002 Location: Croatia, Rijeka	Standby Hi If I'm not wrong, Mr Pass "X" series amplifiers are all with standby approach. I'm not familiar with that kind of device. I tried to search for standby on the forum, but I could not find any threads relative to this. Iwould like to know if anyone has same existing standby circuit. Would it be possible to built someone, and put it in the Aleph series? Thanks for any input, NHul

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11th March 2002, 11:16 AM	#2
leroy diyAudio Member Join Date: Oct 2001	I think the X-series use the same topology as Mark Levinson amplifiers. That means when you switch from 'on' to 'standby' the power stage is switched off while the pre-amplifier stage remains biased.

11th March 2002, 05:44 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	Please do not refer to the topology of X amps as having any similarity to the Harmon products. I have schematics of those, and no two types of amplifiers could be more dissimilar. The standby in the X amps leaves the supply charged, but shuts down the bias and front end.

12th March 2002, 11:31 AM	#4
leroy diyAudio Member Join Date: Oct 2001	Is the reason of leaving the supply charged to prevent the capacitors getting deformed?

12th March 2002, 06:55 PM	#5
Nelson Pass The one and only Join Date: Mar 2001	No, simply to avoid the monster inrush.

14th March 2002, 04:49 AM	#6
BrianGT diyAudio Moderator Emeritus Join Date: Jan 2002 Location: near Atlanta, GA	For standby mode, could you simply put a dual pole switch on the + and - voltage lines coming out of your capacitors? Would that cause problems? Would a 20A switch be enough for this? -- Brian

14th March 2002, 09:27 AM	#7
NHul diyAudio Member Join Date: Feb 2002 Location: Croatia, Rijeka	For shuts down this stage, where exactly in way of bias and frontend put the relays ? NHul

14th March 2002, 03:51 PM	#8
leroy diyAudio Member Join Date: Oct 2001	Place a relay between the supply capacitors and the rest of the amplifier. Just make sure the supply for the relay coil is taken from the capacitors of before, otherwise you can switch your amp standby but can never turn it on anymore