Bob Cordell Interview: Power Supplies - Page 87 - diyAudio
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Old 17th April 2012, 11:10 AM   #861
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Join Date: Sep 2006
Quote:
Originally Posted by LineSource View Post
What is the best power supply design for packaging 3-amplifiers in one chassis?

I build 3-channel amplifiers in one chassis driven by a 3-way digital crossover in order to direct-drive one 3-way speaker: woofer(20-80hz); midbass(80-1.4KHz); tweeter. The driver circuit topology is identical for all three amps. The number of output transistors varies by function: 8-pairs for woofers; 4-pairs for midbass and tweeter.

I currently have a separate electronically regulated +/- 52V power supply on each amplifier driver PCB, and one large 1,500VA +/- 45V shared CRC supply common-ground shared for all output stages. The output stage is on a separate PCB screwed to the heatsink. The driver PCBs are on 1.5" stand-offs attached to the output PCB in order to isolate high output current noise and heat. This packaging also makes it easy to exchange experimental driver circuits. Heavy wire creates a common star ground on the CRC ground bus bar.

Lately I have been wondering if a separate L-C for each amplifier coming off one common rectified C would produce cleaner, more isolated sound. (common_C) + (local_LC) filtering.

What is the best power supply design for packaging 3-amplifiers in one chassis?
Hi LineSource,

What you've described here sounds very well thought-out. It is in some ways similar to what I did with my Athena active 3-1/2 way speakers described on my web site at CordellAudio.com - Home.

With the Athenas, the amplifiers were built right into the speaker enclosure. The four 125-watt MOSFET power amplifiers in each speaker shared a common power supply and, like you, I used boosted supplies for the drivers. The boosted supplies were well-filtered but not regulated to a fixed voltage.

My crossovers were analog active.

I think one large power supply is fine for driving the output stages, but that good filtering and isolation for the supplies for the drivers is a very good idea. If one wanted to go a step further, a separate large supply for the output stage of the amp driving the woofer might be a good idea.

Cheers,
Bob
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