Hi Unclejed,
Thanks for the input, I'd forgotten I need the transformer, I started writing up part two of the notes from this thread last night but didn't get a chance to finish. My caps and opamps came this morning. The LM3886 is an impressive creature. The 2N3055 also arrived, I can remember seeing similar transisors in various household goods over the years, I'd always wondered what they were. Made me think of the 1960s sci fi show "The Invaders".
Hi Eric,
Thanks for the schematic. That's going to be very helpful
I had a 555 timer before my recent move but I can't find it now. I will drop into the electronics store at lunch time and get one. I need to order the transformer I doubt the store will have that, but I'll ask. My target is 130KHz. I think I will supply the LM3886 with the 24V +/- and 0.8 amp supply I have, rather than a single rail use. The timer website is excellent. You do always have the best links. I'm impressed!
Thanks,
Antknee.