I had to put together in a hurry a power amp for a live event.
So, using what I had available, I used some dusty 1Kw rated class B buffer that I had available from industrial application and rigged up WITH A 100 mA VAS + input on a veroboard.
Since speakers were not mine, I had to think to a DC protection. I had no adequate Relays available, BTW. The final stage was supplied 50-0-50 VDC (same 1kW stuff), so the only thing that I could do was to put two 10.000 uF/ 50V electrolytics back to back (the two minus wired together)in series with the buffer otput, plus a F (fast) fuse (only 4 A !) after. Something like you would do with aclass A single ended stuff.
They are the red ones on the picture, taken on the test bench (using 3 Ohm power resistors).
The thing looked to work quite well at the scope and sounded good enogh, so the event went on about 4 hours of play including rehersals and the stuff survived.
Was it pure luck or the concept stands somehow?
So, using what I had available, I used some dusty 1Kw rated class B buffer that I had available from industrial application and rigged up WITH A 100 mA VAS + input on a veroboard.
Since speakers were not mine, I had to think to a DC protection. I had no adequate Relays available, BTW. The final stage was supplied 50-0-50 VDC (same 1kW stuff), so the only thing that I could do was to put two 10.000 uF/ 50V electrolytics back to back (the two minus wired together)in series with the buffer otput, plus a F (fast) fuse (only 4 A !) after. Something like you would do with aclass A single ended stuff.
They are the red ones on the picture, taken on the test bench (using 3 Ohm power resistors).
The thing looked to work quite well at the scope and sounded good enogh, so the event went on about 4 hours of play including rehersals and the stuff survived.
Was it pure luck or the concept stands somehow?