I was building an EICO signal tracer in 1967. It had a 450 VDC supply available on the front panel.
I finished it up, plugged it in, and plugged a test lead into the 450 VDC jack.
The part I learned is that EICO provided banana plugs with an exposed screw. I was hanging on to the exposed screw and the metal box when I plugged in the test lead.
After I got up off the floor and threw the Signal Tracer against the wall, I never used it. It was a dinosaur the day I built it. All it was good for was practice building circuits and practice getting knocked on my butt.
I finished it up, plugged it in, and plugged a test lead into the 450 VDC jack.
The part I learned is that EICO provided banana plugs with an exposed screw. I was hanging on to the exposed screw and the metal box when I plugged in the test lead.
After I got up off the floor and threw the Signal Tracer against the wall, I never used it. It was a dinosaur the day I built it. All it was good for was practice building circuits and practice getting knocked on my butt.