diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Solid State (http://www.diyaudio.com/forums/solid-state/)
-   -   audio concepts PA-3B schematic? (http://www.diyaudio.com/forums/solid-state/17473-audio-concepts-pa-3b-schematic.html)

Zen Mod 8th July 2003 10:49 PM

audio concepts PA-3B schematic?
 
anyone?

Zen Mod 31st July 2003 03:36 PM

pleeeeeeeaseeeeeeee!
anyone?

djk 2nd August 2003 04:55 PM

It's a single ended diff input pair with the tail fed from an active current source.

The VAS, which is cascoded and has an active current source, is driven by a resistive load in the diff pair.

LEDs are used in the current sources.

Very simple.

Musical Concepts even shows the board layout at their site.

Zen Mod 2nd August 2003 11:29 PM

I know that-and that's reason why I asked for schmtcs;
I just wanna see values and to do some analysis,not to copy it.
anyway-tnx for reply ;)

Zen Mod 11th May 2004 11:03 PM

hehe........still looking for schmtc.........
?

ronzeman 30th July 2008 11:59 PM

Audio Concepts PA-3C
 
Has anyone installed this in thier Hafler? What are the results?

Dick West 3rd August 2008 08:36 PM

Are you people discussing the Musical Concepts replacement boards or something from Audio Concepts?

I have MC PA3-B boards installed in a Hafler chassis and love their sound. It is my reference amp. More smooth and detailed than the Hafler with clear solid bass (not boomy or muddy).

But, the LC-100 kit of PS caps should also be installed. They do make a difference.

ronzeman 3rd August 2008 09:15 PM

Yes Musical Concepts Mod PA-3C
 
I'm new to these forums...have followed your journey w/ Hafler mods through many threads. I have the MC manual for what they call their PA-3C mods. Any comments as to its value and sound improvements. My Hafler 200 was purchased and assembled by me in 1981.. (Paid $279.00 for the kit..I still have the receipt!)

PS:I sent you an email with same questions while you were answering my first post

djk 3rd August 2008 11:38 PM

"I just wanna see values and to do some analysis,not to copy it."

The tail current for the diff pair is 3.6mA, 1.8mA per device.

The cascoded CCS is 22mA for the cascoded Vas.

Green LEDs are used at 3.7mA for voltage references for the CCS.

Zen Mod 3rd August 2008 11:47 PM

Quote:

Originally posted by djk
"I just wanna see values and to do some analysis,not to copy it."

The tail current for the diff pair is 3.6mA, 1.8mA per device.

The cascoded CCS is 22mA for the cascoded Vas.

Green LEDs are used at 3.7mA for voltage references for the CCS.


tnx .

;)


All times are GMT. The time now is 08:04 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2