I am trying to simulate the Doug Self Class B Blameless Power Amp Design.However with an input signal of 1V at 1KZ I am getting the same at the output. Can anyone tell me what i might be doing wrong.Thanks.
As I recall C12 was marked as 100pF in the documentation supplied with the PCB's and certainly my examples I built (on the official boards) were unstable and oscillated continually with that value fitted. I think 15pF or 18pF was the value used in the original magazine articles.
Thanks Kay Pirinha.Don't know how it missed that one.
Yes Mooly.It didn't make any difference to me when simulating but presumably in reality things would not look so good!
In that thread PB2 (Pete Basel) was trying to replicate Cyril Bateman's bench test with a speaker cable using Doug Self's amplifier that self destructed due to a strange RF oscillation.from the speaker cable and amp interaction.
PB2's simulation did not oscillate with a simple (lumped) cable model. So it needs more work to replicate the cause of oscillation so the problem can be understood. Cyril did not find the reason before passing (RIP).
Thanks Kay Pirinha.Don't know how it missed that one.
Yes Mooly.It didn't make any difference to me when simulating but presumably in reality things would not look so good!
Hi erikovsky,
No problem.Here is the Multism file.I actually built an amp from the Doug Self Blamless Class B amp design over 10 years ago which I am still listening to.