that1510 based mic preamp problems

OK, that sounds reasonable. Would be interesting to have an order of magnitude of the resulting current noise.

BTW, Farnell stocks 1N4007GP as well.

Samuel

Ahhh, I'd only been looking for the 1N4004GP's. Thanks for the heads up!

Looks like a good time to order some 4R9 metal films and better quality caps as well.

cheers
Paul

Just FYI, Digi-Key carry the 1N400xG series by Diodes Inc., which - according to the data sheet - is glass passivated too.

JD "not tested 'em, so YMMV" B.

This probably deserves a topic of it's own, but I'm looking at building 2x this preamp into a simple 2:2 ENG style field mixer, with master channel faders, channel assignment (L/Both/R - no pan pots), headphone monitoring and led metering.

I was toying with the idea of putting the mixer stages between the '1510 and the buffer opamp, but realised the buffer feeds back into the '1510, so I guess I really need to the treat the mic preamp as a complete building block?

I'm assuming I can remove the 49R9 loading resistor on the output if the next stage is a summing amp?


cheers
Paul

[quote author="pj"]I'm assuming I can remove the 49R9 loading resistor on the output if the next stage is a summing amp?[/quote]

Sure.