LM317T Voltage Regulator with Pass Transistor

Replacing the PSU regulator in a Ham International JUMBO, like the COLT/MARKO EXCALIBUR's these radios PSU units were not really up to the job and as so many people like to turn up the power this only stresses the regulator transistor and causes it to fail. Replacing the original regulator with a TIP3055 is a big improvement on the original and gives plenty of current for those looking for a bit more output.



http://www.youtube.com/watch?v=NapOOzspNrY&hl=en