15-03-2014, 09:25 AM
Ditto as refugee says, I'm assuming that your 220 ohm resistor is connected in place of the original missing resistor and that the 12 volts from your external PSU is connected to the rectifier side of that resistor.
If connected as above then the voltage on the rectifier side of the resistor should read somewhere near 12 volts eg: 11 to 12 volts, it's this voltage that is feeding the the PA board directly, if that voltage settles around that figure it would for the moment indicate that the PA stage is ok so far.
If the above is ok then it's the voltage on output side of the resistor that is needed in order to get an idea of the current draw of the circuit(s) it's supplying.
Lawrence.
If connected as above then the voltage on the rectifier side of the resistor should read somewhere near 12 volts eg: 11 to 12 volts, it's this voltage that is feeding the the PA board directly, if that voltage settles around that figure it would for the moment indicate that the PA stage is ok so far.
If the above is ok then it's the voltage on output side of the resistor that is needed in order to get an idea of the current draw of the circuit(s) it's supplying.
Lawrence.
