Following my Previous posts I have had more mail re these PSU’s, GW4TOD has a problem with the Voltage leaping up intermittently which sounds very similar to my original problem. Hopefully we can help solve that one.
OK I have heard back from GW4TOD, his problem was indeed the Set Voltage Pot at fault. Now I know of another example I will warn that this is a common fault and a serious one at that. The over voltage could possibly do damage to equipment. I recommend either my 12Volt float battery system or Thyristor Crow Bar circuit across the output.
Really good news he has found the circuit diagrams for several versions of the supply, these will be very helpful. Thanks for passing them on.
They are available to download from me here:-