JAW regulator discussion

[Fred]

Can you do me a favour and insert a three low value resistors, one on the input, one on the output and one on the ground leg. Measure the voltage across each and post a video doing it. Doing it this way might be more consistent than trying to insert a meter into the circuit.

If it has 500mA on the input and 200mA on the output then it must have 300mA to ground. If that is the case the regulator is damaged or wrong. Which manufacturer is the reg from?

[shameem]

It was supplied by futurlec i think. I did suspect a bad 7805 and replaced it with a 2940 and it's getting hot too - although i havent done the current measurement yet. I have a pack of 1ohm 1 watt resistor lying around somewhere - i will put them in the circuit and measure the voltage.

[Fred]

If the current measures correctly and the thing is too hot then the heatsink is just undersized. If the current is too high on in and out and low on ground then the circuit it is feeding is wrong/damaged/out of spec. If the current is going to ground as you initially said something is wrong with the reg.