[DNG] [OT] Modification of audio power amplifier.

The attached amplifier circuit is the result of many hours of study and development. It is an audio amplifier that can deliver a continuous power of 250W at 8 Ohms or 450W at 4 Ohms. The resultant distortion figure is around 0.1% for the higher power and about 0 .09% for the lower power. I

Re: [DNG] [OT] Modification of audio power amplifier.

On Tue, 29 May 2018 14:16:02 +0200 Edward Bartolo wrote: > On 28/05/2018, dan pridgeon wrote: > > I hope you will publish your circuit and its description soon. I'd > > like to study it. (a .png would work if you have a sketch of it.) > > Thanks. Dan. > > > > I am afraid there is nothing

[DNG] [OT] Modification of audio power amplifier.

The circuit I sent you is not finished yet. Yesterday, I connected it to the output stage to test how it behaves. At first, it oscillated at a frequency of 660kHz. I realised this because the heatsink started getting steadily hotter. To decouple high ultrasonic frequencies I used a decoupling

[DNG] [OT] Modification of audio power amplifier.

On 28/05/2018, dan pridgeon wrote: > I hope you will publish your circuit and its description soon. I'd like to > study it. (a .png would work if you have a sketch of it.) > Thanks. Dan. > I am afraid there is nothing new to study. The input is fed to a differential pair powered by a constant

[DNG] [OT] Modification of audio power amplifier.

On 27/05/2018, Bruce Perens wrote: > I salute your amplifier for its freedom from the evil emitter-follower > created by Professor Leonard Puttering. :-) > Had that been the truth, the Professor would have been a very successful electronics engineer. Nevertheless, he has a very

[DNG] [OT] Modification of audio power amplifier.

Thanks for all replies. My first prototype test circuit seems to work as expected although I haven't yet connected the output stage. Connecting a resistor, 10K Ohm, from the inverting input to output, that is, the point between the biasing diodes, resulted in an ouput voltage of 0 Volts. This

Re: [DNG] [OT] Modification of audio power amplifier.

Edward: > Warning: Out of Topic. No relation to Devuan but to technology and > electronics. > > Since, I know some have knowledge of electronics and I am replacing an > amplifier's pre-driver stages I am posting here. ... If you post your question on geda-u...@delorie.com

[DNG] [OT] Modification of audio power amplifier.

Warning: Out of Topic. No relation to Devuan but to technology and electronics. Since, I know some have knowledge of electronics and I am replacing an amplifier's pre-driver stages I am posting here. At present, I am opting to use a simple circuit for testing purposes. This circuit uses a