Hi,
That makes complete sense, sec output =24.5Vac, when open circuit.
I wonder, if during the late evening, the mains voltage has gone up to 125Vac?
That makes complete sense, sec output =24.5Vac, when open circuit.
I wonder, if during the late evening, the mains voltage has gone up to 125Vac?
One other thing you may be able to assist with is that as the amp and power supply are currently sitting on ply wood, the earth terminal is not connected at the IEC inlet. How would yoiu suggest I do this ?
Hi,Puffin said:
the rule we must follow is that all exposed conductive materials must be connected to Safety Earth.
I interpret that in two ways:-
1.) The terminals and sockets must be connected to Safety Earth.
2.) The connection between Audio Ground and Safety Earth can be via a disconnecting Network.
and by implication a third follows:-
3.) The safety connections must survive a direct short to earth/audio ground until the mains fuse has ruptured isolating the supply from the faulty equipment.
I carried out this test recently with safe but surprising results.
I think Andrew described the correct earthing arrangement in another thread recently. But to give specific advice we would need to know what case you are going to use.That is, will it be metallic, will the amp section be in a separate case, etc etc. 😉
In that case you have to look for any conductive parts that could cause a shock and make sure they are earthed. As Andrew says, connector should be earthed. And in the PSU section makes certain none of the parts carrying mains voltages can be touched.
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