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Old 6th April 2013, 01:21 PM   #1
hahfran is offline hahfran  Germany
diyAudio Member
Join Date: Dec 2007
Default battery powered power amps

Some yaers back an extremely expensive battery powered power amp gained tons of superb reviews. Of course !
Thinking about a way to combine battery powering with inexpensive switching PSU.
Accu packs for DIY home improvement tools such as drilling machines are relatively cheap they come with for ex. 10.2 Volts capacity 1.5 Ah.
So how to combine battery powered preamp with switching PSu powered power amp?
The obvious difficulty is the VAS. A first idea is attached here intended for
Thermal Track power BJTs. It should be noted the output configuration is just a current mirror.
Attached Images
File Type: jpg AccuAmp.jpg (107.2 KB, 84 views)

Last edited by hahfran; 6th April 2013 at 01:26 PM.
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Old 6th April 2013, 05:28 PM   #2
iaxxaxxai is offline iaxxaxxai  United States
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Join Date: Mar 2013
Location: Indianapolis
Interesting idea. Any chance the Dynaudio amplifier from the 90's is the inspiration?
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Old 6th April 2013, 05:51 PM   #3
hahfran is offline hahfran  Germany
diyAudio Member
Join Date: Dec 2007
No its an idea once published by Philips Netherlands lab. Around 1978 or so.
Thermal instability was a major issue.
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