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The Blomley Class B amplifier
The Blomley Class B amplifier
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Old 25th May 2018, 05:36 PM   #31
Antoinel is offline Antoinel  United States
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The Blomley Class B amplifier
Hello Ian and thank you for your above post which overflows with a generous dose of valuable knowledge, expertise and guidance.

The CSD power output stage in your [.asc file] is the one to use. In addition to the independent and proven results of your research, its resultant pulse currents are identical in magnitude for the upper and lower Pout half-stages. With the added bonus of a stay-on current [your term] once the pulse disappears. Meaning the output transistors do not turn off in operation This is a real accomplishment and a leap forward for improving this and other amps.

I'll buy the Linear Audio Vol. 13 which has your article on CSD. And also read-in the links at the bottom of your posts. There's a lot of education therein and in Linear Audio.

I have a suggestion which I hope that you consider; because of our intense interest, enthusiasm and evident skill in this subject matter and more. You've already done a lot of research towards the following suggested power amplifier, and I feel that you are having a lot of fun in this thread.

1. Take your Cube-Law Class A amplifier.
2. Remove the cube-law and linear drivers.
3. Plug-in a CSPR at the vacant location of the above drivers.
4. The valuable enhancements which precede and follow the CSPR driver stay.
5. The PCB for the Cube-Law Class A amp exists. An epi-board for CSPR can hopefully sit on top for the time being. That'll be a beautiful sight to see.

I will continue to look forward to your theoretical and practical output. This nonstandard topology [thanks to Blomley] is truly in evident great hands [yours]. I am glad for this open source diyAudio which continues to offer new possibilities for other amplifiers to happen.

Best wishes

Anton
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Old 3rd June 2018, 08:38 AM   #32
haiqu is offline haiqu  Australia
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Quote:
Originally Posted by Mooly View Post
There was a recent article on the Blomley over on 'allaboutcircuits'. Its a great read.

My 40-Year Love Affair with a Remarkable Amplifier—A Class B Amplifier for Audiophiles

I also did a sim for curiosity. You will need to put your own models into it and alter voltage source V1 to get the desired quiescent current:
Where do I find "discrete models.txt" required by this sim?
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Old 3rd June 2018, 09:29 AM   #33
IanHegglun is offline IanHegglun  Australia
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Quote:
Originally Posted by haiqu View Post
Where do I find "discrete models.txt" required by this sim?
I got around this in Post 10 sim by adding:
.include Cordell-models.txt
.model 2N2955 ako:MJL21193C

and remove the ".inc discrete models.txt"
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Old 3rd June 2018, 09:59 AM   #34
haiqu is offline haiqu  Australia
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Thanks Ian.
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Old 3rd June 2018, 01:37 PM   #35
Mooly is offline Mooly  United Kingdom
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The Blomley Class B amplifier
Have you got the sim working now ?
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Old 4th June 2018, 04:19 PM   #36
N101N is offline N101N
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Unfortunately, the suggested solution is based on some erroneous assumptions. Whenever the dynamic (signal) energy level is in excess of the static (DC bias) energy level, there are two possible scenarios: either switching to higher static (DC bias) energy level or remaining in saturation (nonconducting state).
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