[time-nuts] KD2BD WWVB receiver/decoder in QEX

Charles Steinmetz csteinmetz at yandex.com
Mon Nov 23 05:02:27 EST 2015

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,


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