3 ms·

Thanks. That makes sense. The rhythm machine takes AC at 120 and 220 through two separate figure eight female jacks. It's from India. Then there is a transfor

Thanks. That makes sense. The rhythm machine takes AC at 120 and 220 through two separate figure eight female jacks. It's from India. Then there is a transformer that outputs ~6.2v from my 120v AC (don't know what it would be from 220). It would make sense if the transformer was sourced off a shelf at the cost of a voltage regulator which there appears to be.

sitharus 4y ago
That's a pretty typical design for power supplies. Transformers output depends on the mains input. Where I am this is nominally 230V, but in reality ranges from 235-245V. So they often use a linear regulator to obtain the required voltage, but these need to drop from a higher voltage so they choose a range that would require the least dissipation.
Majromax 4y ago
6.2V AC? That's 9V peak-to-peak, so after rectification it would be 9VDC less diode drops.
ofalkaed 4y ago
That is an odd layout*, is the schematic online somewhere? Since this is older gear, it is probably a 6.3V transformer, 6.3 and 12.6 volt transformers were some of the most common and cheapest voltages before the rise of cheap switcher supplies. 6.3 and 12.6 were the optimum voltages for powering the filaments of vacuum tubes and became standard voltages in transistor gear since they were cheap and available, even today transformers in these voltages are easy to find cheaply on the surplus market. *Edit: Nevermind, I read that as you had 120 and 220VAC transformers followed by a 6.3VAC transformer, you have one transformer with 120/220 primaries and a 6.3VAC secondary. Not odd at all.