12-20-2013, 01:41 PM
The calculated frequency of this is about 39.7 Hz, but then your caps which are lytics are probably at least 20% tolerance hence your deviation.
Also, the transformer here presents sheer inductance when not loaded, so driving it with switching transistor can present (potentially) a danger of killing the transistor unless each half is shunted with a reverse-biased diode (pretty much as DC relays are). When loaded it is not a problem but then you never know when you accidentally power it unloaded. A snubber wouldn't hurt either.
If it were a sinewave gen that'd be fine but this is a multivibrator.
Also, the transformer here presents sheer inductance when not loaded, so driving it with switching transistor can present (potentially) a danger of killing the transistor unless each half is shunted with a reverse-biased diode (pretty much as DC relays are). When loaded it is not a problem but then you never know when you accidentally power it unloaded. A snubber wouldn't hurt either.
If it were a sinewave gen that'd be fine but this is a multivibrator.
