Input stage biasing - BJT

[CBS240]

Don't under-estimate what can be done with a couple of cheap-O proto-boards. This stereo has been working great since Feb. I'm am listing to it right now.🙂 There is well over 100 transistors, almost all are SOT-23, in the entire circuit.😀 SMD 603 resistors. About 25-30W/Ch.

 

[CBS240]

And...

 

[steve_mak]

It must be nice to have some fruit of labour!

It is encouraging to see.

Cheers,

 

[hienrich]

hi guys

i just need to know about the advantages of having
some Sziklai pair in the input differentials

and I found it very interesting most specifically on the sonic side.

😉

thanks

macweb

 

[CBS240]

Hi

I had a few PCB's made for a new power supply board. The board house had a speacial for PCB's produced with top and bottom copper only. Cost was $89 for 5, and that cost was credited to the next a full spec board cost, IOW free.😀 Those transfos in the picture came from some old junk that would otherwise have been garbage. But I couldn't stand to toss them, better to use them. I took all the iron out, re-wound the secondaries proper for my circuit, and reasembled the core. Lot of time spent, took several hours. One could spend LOTS of money on power transformers though.🙄 I try to spend as little as possible on proto-stuff, time spent developing it is bad enough.