PS Audio Moving Coil Amplifier (MCA) Schematic

AnalolgAlley · 17th April 2007, 09:08 PM

Trying to locate a schematic on the PS Audio Moving Coil Amplifier (their terminology) no model number but successor was the MCA-2. Current company does not have anything on older equipment.

The Peasant · 18th April 2007, 12:18 AM

Many years ago I traced out the schematic for one of these, it's actually quite a simple circuit. I can probably dig it out and scan it for you if you like, although it wouldn't take a lot of effort to do it again.

Are you having problems with one or are you just curious?

Take care,
Doug

AnalolgAlley · 18th April 2007, 03:23 AM

"Are you having problems with one or are you just curious?"

A little of both. Just bought one and want to make sure everything is halfway right.
One thing I REALLY need is information on the AC adapter (volts, polarity, etc.)

I'd appreciate any information you have.

The Peasant · 18th April 2007, 04:43 AM

OK, I have found the instruction sheet that came with the unit, as well as a specification sheet, and my old hand-drawn schematic. There are no component values on my schematic, and it's pretty messy.

I'm not sure of the specifications for the adapter, but on the weekend I could dig out my actual amplifier and measure it for you, and get actual component values as well if you need them. The adapter just supplies AC to the main unit where the rectifiers are located, so it's really just a power transformer. PS Audio originally sold this product with a small low current transformer (~0.5 amps) and later added a high current optional transformer(~3 amps). Personally, if I was still using mine I would add a regulator to the power supply as it has none. I had upgraded most of the capacitors in mine many years ago, this made a very significant improvement to the sound as did upgrading the transformer.

If you send my your email address via private mail I can send you the scans.

Take care,
Doug

EC8010 · 19th April 2007, 03:49 PM

I've moved this thread to a forum where it is more likely to be seen and get a response.

The Peasant · 20th April 2007, 09:13 PM

I measured the voltages today:

The transformer is supplying 27.5 volts AC, which results in 36 VDC after the rectifiers. I would guess that a 24 or 25 volt @ 2 - 3 amp rated transformer would be about right.

Take care,
Doug

AnalolgAlley · 21st April 2007, 12:35 AM

Thank you sir. Now I can start doing something. Hopefully not leading to puffs of smoke. <grin>

17th April 2007, 09:08 PM	#1
AnalolgAlley diyAudio Member Join Date: Apr 2007	PS Audio Moving Coil Amplifier (MCA) Schematic Trying to locate a schematic on the PS Audio Moving Coil Amplifier (their terminology) no model number but successor was the MCA-2. Current company does not have anything on older equipment.

18th April 2007, 12:18 AM	#2
The Peasant diyAudio Member Join Date: Mar 2004 Location: Sunny Alberta	Many years ago I traced out the schematic for one of these, it's actually quite a simple circuit. I can probably dig it out and scan it for you if you like, although it wouldn't take a lot of effort to do it again. Are you having problems with one or are you just curious? Take care, Doug __________________ The Electronic Peasant www.electronicpeasant.com

18th April 2007, 04:43 AM	#4
The Peasant diyAudio Member Join Date: Mar 2004 Location: Sunny Alberta	OK, I have found the instruction sheet that came with the unit, as well as a specification sheet, and my old hand-drawn schematic. There are no component values on my schematic, and it's pretty messy. I'm not sure of the specifications for the adapter, but on the weekend I could dig out my actual amplifier and measure it for you, and get actual component values as well if you need them. The adapter just supplies AC to the main unit where the rectifiers are located, so it's really just a power transformer. PS Audio originally sold this product with a small low current transformer (~0.5 amps) and later added a high current optional transformer(~3 amps). Personally, if I was still using mine I would add a regulator to the power supply as it has none. I had upgraded most of the capacitors in mine many years ago, this made a very significant improvement to the sound as did upgrading the transformer. If you send my your email address via private mail I can send you the scans. Take care, Doug __________________ The Electronic Peasant www.electronicpeasant.com

19th April 2007, 03:49 PM	#5
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	I've moved this thread to a forum where it is more likely to be seen and get a response. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

20th April 2007, 09:13 PM	#6
The Peasant diyAudio Member Join Date: Mar 2004 Location: Sunny Alberta	I measured the voltages today: The transformer is supplying 27.5 volts AC, which results in 36 VDC after the rectifiers. I would guess that a 24 or 25 volt @ 2 - 3 amp rated transformer would be about right. Take care, Doug __________________ The Electronic Peasant www.electronicpeasant.com


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18th April 2007, 03:23 AM	#3
AnalolgAlley diyAudio Member Join Date: Apr 2007	"Are you having problems with one or are you just curious?" A little of both. Just bought one and want to make sure everything is halfway right. One thing I REALLY need is information on the AC adapter (volts, polarity, etc.) I'd appreciate any information you have.

21st April 2007, 12:35 AM	#7
AnalolgAlley diyAudio Member Join Date: Apr 2007	Thank you sir. Now I can start doing something. Hopefully not leading to puffs of smoke. <grin>

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