15-03-2014, 09:02 PM
(15-03-2014, 08:38 PM)richard296 Wrote: plugged into mains after soldering the 15watt 150 ohm ceramic/cement resistor in place.It's the same physical size as the resistor on the 7 volt side (see pics). The ac voltage on bridge was 48 volts and 9v on the other circuit. dc voltage on resistor tail next to bridge and earth 65.5 volts. other side of resistor was 50volts. On the other low voltage circuit it was 14.3 volts on both sides of resistor to earth. hope this helps richie.
That means that the current flowing through 150 ohm 15 watt resistor is a approx .1 Amp (100 ma) that current is well within the resistors rating at the voltage that it's dropping in your measurements.
The AC in versus DC out from both bridge rectifiers is in the ballpark of what would be expected.
The resistor in the other (lower voltage) rail is wire wound so we would expect to see a voltage drop across that too, unless it feeds a circuit that is switched in by a user control.
Lawrence.
