English Amiga Board - View Single Post - Amiga 600 Rev 1.1 Op-Amp problem

turrican9 · 22 July 2020, 00:02

As soon as I put the good LF347 back in the Rev 1.1 board I'm missing the positive voltages on all pins. All shows as negative. And the +12v pin shows just a few negative volts. If I remove the OP amp then I have +12v on the pad.

I also put the op amp that came from the rev 1.1 board into the Rev 2D board. It seems it's not working correctly in this board either.

The op amp in the rev 1.1 board just says '347' and is a little bit smaller package VS the LF347 that came from the 2D board. Maybe they are not compatible with each other?

I should try to put the original one back in the 1.1 board to see if I get the positive voltages back and the +12V

22 July 2020, 00:02	#3
turrican9 Registered User Join Date: Apr 2015 Location: Norway Age: 47 Posts: 893	As soon as I put the good LF347 back in the Rev 1.1 board I'm missing the positive voltages on all pins. All shows as negative. And the +12v pin shows just a few negative volts. If I remove the OP amp then I have +12v on the pad. I also put the op amp that came from the rev 1.1 board into the Rev 2D board. It seems it's not working correctly in this board either. The op amp in the rev 1.1 board just says '347' and is a little bit smaller package VS the LF347 that came from the 2D board. Maybe they are not compatible with each other? I should try to put the original one back in the 1.1 board to see if I get the positive voltages back and the +12V Last edited by turrican9; 22 July 2020 at 00:11.