22-01-2018, 12:01 AM
(21-01-2018, 08:24 PM)Crackle Wrote: I am wondering if it was intended to measure resistances with DC and only switch in the buzzer for capacitors. I would think the battery drain would be significantly less if the buzzer was not operating on the resistor range.
thanks
Mike
How would you hear the null in the phones with DC? Yes they are distracting, that's why the electronic oscillator was being touted in that article. Anywho, pal Don has a capacitance/resistance bridge by STC that looks nothing like yours
but has very similar guts, the only thing different is the lack of that 200pf capacitor, and the second wafer on the range switch, he says its a compensation capacitor, I dunno but I stared at the diagram we worked up from his, and your layout picture, and there's no difference between them.Don claims his to be 1937 vintage and is wired with cotton covered rubber insulated wire throughout, but now sports a 555 chip oscillator.
So, here you go!
