Hello Bruce, I agree. The DAC reference is an LM7805CT regulator with 0.8mV/C (typ.) temperature coefficient. Considering that typical Oscillators (MTI units for example) have about +-20Hz deviation per 5V - this alone - excluding the Opamps tempco, would lead to a temperature drift of 0.32Hz over a 50 Deg C temp range. That's about 3.2E-08, quite a bit worse than a good surplus oscillator. And the 7805 does not have a maximum tempco rating, so it could be 10x worse than that... bye, Said
_______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
