Burning Stencils

If you used a 12/24 type transformer all you have to do is use the 12 volt tap of the transformer instead of the 24v. The one marked, don't use tape on the diagram. Open up your unit and look for an unused tap on the transformer and with it plugged in CAREFULLY check with a voltage meter. But, i bet you are using salt water as an electrolyte. I did at first and burned stencils a 24v and went to 12 volts. Then I got some real electrolyte and after using it went back to 24 volts and am NOT burning up my stencils.
 
All of the 5 wires from the transformer were used in CC directions. I have some real electrolyte, but I'm using qtips for for my marking pad.

I'm trying to make sense of this post

I think there's more than one way to do it.

In the schematic, there's a wire from transformer wire 2 that goes to pin 1 on the rectifier and pin 3 on the dpdt switch. On the Chris Crawford website, transformer wire 1 is used instead.

What I did was made transformer wire 1 go to one side of the switch, transformer wire 2 go to the other, and the middle wire of the switch goes to the combination of pin 1 on the rectifier and pin 3 on the dpdt switch.


The goal is to switch the wire contacting pin 1 on the rectifier and pin 3 on the dpdt switch between wires 1 and 2 on the transformer.

It helps to use a continuity tester of some sort and play with the switch - for example, the "up" position on the switch connects the two BOTTOM pins, and the "down" position connects the two TOP pins.
 
I'm using a doorbell transformer. It can be wired for 8, 16, and 24 volts. I got mine off amazon. It's made by zenith.
 
If you used the transformer listed from a yellow tap to the black tap should be the lower voltage occoording the ths specs and comments. I do use a small nylon handle I made with a piece of 3'4"x 1/2" stainless plate recess bolted on with felt pad held in place by a rubber band.

The spst (single position single throw) is the on off sw . The dpdt (double position double throw) is the sw that changes output from ac to dc.
 
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