Paul wrote:

It appears that the Chinese sight has the lmc6484 and LM387n at reasonable
prices for small quantities. Most likely will order from there.

No need to buy likely counterfeit parts on ebay. The LMC6484 is an active-status part, available in both DIP and SOIC from all major distributors including Mouser, Digi-Key, Arrow, and Avnet (the DIP may be EOL, but is still in stock at distributors). The LM387 is a nothing-special, first-generation "low noise" dual opamp. Its dubious claim to fame is that it does not use the industry-standard dual opamp pinout. But since there are no boards available, that wouldn't seem to make any difference. The ubiquitous NE5532, available everywhere, is better in every way, with the standard pinout. Or do like the author did and use whatever low-ish noise dual opamps you have in *your* junk box.

The PIC16F88 and DS232A are active-status parts, available from Microchip and Maxim distributors, respectively.

It seems like a LOT of circuitry to do what really is a pretty simple job, though.

Best regards,

Charles


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