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

paul swed paulswedb at gmail.com
Mon Nov 23 09:27:21 EST 2015

Charles it is a lot of circuitry. But if you want just frequency out then
lots of stuff drops out. Since I have experimented with much of this
already I will do the reduced versions. There is no need for the PIC, the
+- 45 degree chager in the front end, numbers of dividers, output
selectors, analog detection, of the old time code etc.
The one thing I noticed about the LM837n was that its gain bandwidth
products was at least 2-3 X a typical tl084 as an example so a bit better
for 60 KHz.
Really like your suggestion of the NE5532. Have quite few of those will
take a look to see what the implications may be.
Also post down conversion to 10 Khz I was scratching my head as to why not
the TL08X series.
Still a good job and glad it was shared.

On Mon, Nov 23, 2015 at 5:02 AM, Charles Steinmetz <csteinmetz at yandex.com>

> 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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