Hello
I have built now five Leach Amps into sheet metal boxes. What bothers me is that...
I first used too small screw connector strips for 230V AC and nothing between them and the sheet metal. Nothing bad happened and I was told about this, so I switched to bigger screw connector strips and put 2mm of oversised top quality rubber sheets between the s.c.s. and sheet metal.
See
http://www.cs.helsinki.fi/u/kmtsundq/leach4.html
to get an idea. Sorry, all text is in Finnish. All links are to pictures.
I have a power switch in every amplifier. I have first tied and then soldered the leads that come to these switches, but someone told me that the only right way to do it is to use an Abiko connector (a thing that has the lead tightly squeezed in one end and the other end is pushed to the switch's terminal).
Is it safe to use mains voltage on a plastic prototype board?
How big clearance is needed between mains voltage and grounded or low-voltage parts on the same board? I have tried to have 5mm or more always.
Or if using the same board for mains voltage and low voltage is allowed at all?
My ground bolt is correctly made. The lead that goes from chassis to mains connector is lowest in the stack, and separately fastened, and with tooth washers on both sides.
Worst thing I did was in two amplifiers that I am not using now, and wonfer if I should somehow fix or disassemble them. I used a relay with it's associated components to switch mains to the big 545VA transformer and placed the relay on a piece of prototype board I glued to the inside of the sheet metal front panel.
See
http://www.cs.helsinki.fi/u/kmtsundq/l4kuvat/disaster2.jpg
for details
-Kimmo Sundqvist
I have built now five Leach Amps into sheet metal boxes. What bothers me is that...
I first used too small screw connector strips for 230V AC and nothing between them and the sheet metal. Nothing bad happened and I was told about this, so I switched to bigger screw connector strips and put 2mm of oversised top quality rubber sheets between the s.c.s. and sheet metal.
See
http://www.cs.helsinki.fi/u/kmtsundq/leach4.html
to get an idea. Sorry, all text is in Finnish. All links are to pictures.
I have a power switch in every amplifier. I have first tied and then soldered the leads that come to these switches, but someone told me that the only right way to do it is to use an Abiko connector (a thing that has the lead tightly squeezed in one end and the other end is pushed to the switch's terminal).
Is it safe to use mains voltage on a plastic prototype board?
How big clearance is needed between mains voltage and grounded or low-voltage parts on the same board? I have tried to have 5mm or more always.
Or if using the same board for mains voltage and low voltage is allowed at all?
My ground bolt is correctly made. The lead that goes from chassis to mains connector is lowest in the stack, and separately fastened, and with tooth washers on both sides.
Worst thing I did was in two amplifiers that I am not using now, and wonfer if I should somehow fix or disassemble them. I used a relay with it's associated components to switch mains to the big 545VA transformer and placed the relay on a piece of prototype board I glued to the inside of the sheet metal front panel.
See
http://www.cs.helsinki.fi/u/kmtsundq/l4kuvat/disaster2.jpg
for details
-Kimmo Sundqvist