Re: Need help I put volts on the speaker connection. Ouch. Smoke.
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Well, I'm not the most experienced radio builder/repairman, but looking at the schematic, I think you could just have fried C111 or the LM386 itself.
Can you check for a signal on pin 5 of the LM386? Try following your signal path by looking at the schematic until you recover it, an RF probe could help
Dan
HK4DEI
On Tue, May 16, 2017 at 1:31 AM, Jim McKay <mckayjim65@...> wrote: Oops. I feel like a berk. Honey I smoked the BITX.
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I just got my BITX40 set up and A Ok on receive. I disconnected everything as I was putting it all in a box but when I put it back together I connected the Power Amplifier voltage to the Speaker PCBplug. There was smoke and an acrid smell from the area of the speaker pcb plug. I think I have fried my board. No obvious signs of damage like bulging capacitors or broken tracks but doesn’t work now. Raduino still A OK but no sound on receive and no power out on transmit.
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Gutted. Where to start fixing my mistake ??? I am not experienced in repairing electronics so please can somebody help me. Feeling stupid.
Thank you.
Jim
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