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. Regards Paul WB8TSL
On Mon, Nov 23, 2015 at 5:02 AM, Charles Steinmetz <[email protected]> wrote: > 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 > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
