Looks like it was laid out with Letraset and crepe tape direct on the board, then etched. No need to mess around with that expensive presensitised board, simply use the clean bare copper, tape and Dalo pen to fix the gaps, then etch. RIAA setting puts in a pre emphasis for cartridges, so you can sweep frequency with constant level setting, and see if the preamp for a phono stage is correct EQ wise, as it should give a flat response, while the actual signal applied to it varies in amplitude according to the standard. Used to set up phono amplifiers correctly, so you have a level response from the non linear response of the cartridge (most likely moving magnet, or moving coil, though those are pretty rare these days) and the recording chain. There is a reason that a lot of vinyl top end pressings gave info about the actual cutter used, and the EQ applied to it, so the serious audiophile could use the correct cartridge, mostly Shure and Denon, and needle combination to match what the recording engineer actually heard. And yes, that cutter used, all through the audio chain that drove the cutting stylus, LM741 opamps. Mostly because they were upgraded from valves to germanium transistors, then later to silicon transistors, then finally opamps to get lower noise and distortion.

I've got my XR2206s over 3MHz. The output is not quite crystal stable, but its not too bad considering the IC.

The Unit shown is mine. I always cut the linecord on all not testet units.

@TeardownOZ2CPU

Жыл бұрын

SUPER thanks for the info, do you know more about this Jesper G ?

@nielserikmeier9721

Жыл бұрын

@@TeardownOZ2CPU sorry no

Could you share the schematic? Please 🙏

@TeardownOZ2CPU

8 ай бұрын

put this into google : xr2206 schematic