- Joined Nov 10, 2018
I found an AC Power source finally after going through a box of AC-DC wallwarts I'ce collected. I remembered I have a 24v AC Transformer used in a Coffee Roaster controller and loosened a couple twist caps to access the 12-0-12 volt taps (yellow-black-yellow). In the coffee roaster I use yellow-yellow which provides 24VAC output.
Testing Step-up function:
All testing was into the primary side (heavy 10ga wire) of the UPS Transformer to test the voltage out of the 4 secondary winding wires.
Using 12v input:
UPS Transformer secondary wires 1 & 3 output 100 volts
- -wires 1 & 2 output 1 volts
- - (deflection on tester stayed at same pt even while scale changed from 500v-50v-10v)
- -wires 1 & 4 output 1 volts
- - (same as 1&2)
- -wires 2 & 4 output 12 volts
- -wires 3 & 4 output 0 volts
- - (no movement)
Using 19v input (transformer output of 24v dropped to 19v under load of the UPS transformer connection)
-UPS Transformer secondary wires 1 & 3 output 150 volts
Now, how do we interpret the readings above to guestimate expected results when testing Step-Down function with power into the four side secondary wires?
Which wire input combination yields a low voltage, high amperage output on the primary side?