Electronics > Repair

rotary switch with pot

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croyleje:
hello everyone i am working on a Lambda Power Supply i picked up and need a new voltage section switch.  the switch has a rotary voltage selection switch on the outside knob and the inter knob is a pot for fine adjustment (see pic. attached) does anyone know were i can find one of these?  ive looked online with no luck any help would be great.  if not i am just planning on replacing it with a rotary switch then drilling a new hole for a pot.

Jason

German_EE:
I came across the same problem a year or so ago when I was repairing a ham radio transceiver, there is a solution but you will need to hunt for some parts:

1) Find a rotary switch that has the correct number of poles and connections, the switch should be of the 'open frame' type.

2) Disassemble the switch and remove the shaft. In my case the shaft was 6mm but yours will probably be a quarter inch.

3) Replace the shaft with a short length of aluminum or brass tube then reassemble the switch. A certain amount of mechanical ingenuity is required here and every situation is different, in my case the main problem was filing away the shaft to fit the C clip without weakening it too much.

4) Obtain a potentiometer of the right value but with a 4mm shaft. The shaft will probably fit down the tube used on the switch but if it doesn't then it is easy to drill out.

5) Assemble using custom bracket that holds the rotary switch and the potentiometer behind it.

All of this work took me three days but it was worth it because the switch/potentiometer was unavailable and I needed to get back on air.

coppice:
There used to be a lot of these types of device around. Catalogues from switch and pot makers used to have numerous combinations, but the market for them largely evaporated. A source of NOS, or another supply with a different fault might be your best bet. How badly damaged is the switch? Is it beyond salvation?

sunnyhighway:
You did not specify the pot, so this might or might not work for you.

BE-03-002 - Rotary Switch; 5 way, 2 pole (+ 47k Lin Pot)
http://www.audiomaintenance.com/acatalog/Concentric_Switches.html

German_EE:
http://www.audiomaintenance.com/acatalog/Elma_spec2_200.jpg

This is what I made using the aluminum tube but they charge 36 GBP for it, it depends on how much your time is worth.

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