>> C-field polarity switch. An experiment. If nothing else >> I will be able to measure the residual magnetic field.
There is no requirement to do any thing other than switch the C-field polarity. No optical stuff needed. The PRS10 switches the C-field polarity at a 5HZ rate to reduce magnetic effects and does not do any optical tricks! Back in Nov 2017 I detailed my A15 mods: Set Zener current to minimum TC (I achieved < 1PPM/C at the +20V output) This involved disconnecting the C-field circuit and replacing it with a dual (in series ) LM299AH and 1PPM resistors. Jumperable settings and a low TC pot for adjustment. I would have liked to use 3 LM299AH to give me 21 Volts but would need to switch the input to the unregulated supply to give enough overhead. The higher the voltage into the C-field string the lower the TC contribution from the C-field coil itself. The posts have the details and schematic. Cheers, Corby _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
