Leaderboard

ok sorry VR3 is a variable resistor which sets the point at which the 5v is shut down when the power is turned of, this is done to prevent the 5v from dropping below 5v and causing corruption to the program on the main MPU and subsequent RAM corruption. when VR3 fails there is no 5v output, but there is also 2 x 3Amp fuses from the transformer winding which can fail because of 'heavy handling' of the psu and something gets shorted out! Indeed the very first one I did had been looked at by someone else and the 12v regulator had its output at around 20v because it had gone short! not something you want up the 12v line! the 12v regulator transistor was dead short not regulating at all. because these are of metal construction power supplies it is dead easy to short something or do more damage, they are not that forgiving if your not sure what your doing.

Many thanks for this clo.

Superb looking classic thank you for the release. Im going to give the £5 one a bash.