Simplistic NJFET RIAA

diyAudio Chief Moderator
Joined 2002
Paid Member
Tried some parts to see how the board solders. Looks like this 2mm board is very good quality for that. I used 0.5mm eutectic solder wire. No bad residue or fumes, no blob like joints. Flows and sticks to this one great. Because to import a heavy reel of Kester isn't that economical, I got 50g of Mechanic HX-T100 leaded 63-37. Proved fine. Some Takman REY and a Z-Foil went in well. The big one has to stay board proud because it will dissipate some heat. Got to get 1,2,3,4 ON DIP because my 1,2, ON stash jump the pitch when touching together. Bummer.

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diyAudio Chief Moderator
Joined 2002
Paid Member
He he found at a shop downtown. Blue like the PCB even. Nice thing, with just 4 different values from 120R to 1K and the 47K input load permanent I get many combinations by flicking the switches. From 62 Ohm up to 1K or 47K straight. Last one is for TAS readers.:D

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diyAudio Chief Moderator
Joined 2002
Paid Member
The thingy ticks afterall

It gave 63dB and 20.6VP-P before clip with 2x 369s of 11mA Idss at the input stage. Good for low MC this one config. I could not get the scope to lock on any 50Hz at all. Weird given the open air crude test. I have seen a few practical things I would want to revise. Minor PCB parts fitting stuff and a couple of designations I mean. Do you like the blue or in black it will be better?

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