Op amp tester

I was watching How To TEST OP AMPS Using A Multimeter vs Op-Amp Tester Project Single Dual and I learned about this Operational Amplifier OP AMP Tester For Single Dual OPAMP TL071 TL072 TL081 TL082 Single/Dual Op Amp Test Board.

I have to cool it on the spending for a little while, but I’ve made a note of this on my shopping list.

Continuity tester

I had a suspected short circuit in a cable I made (I think I used too much heat on the heat shrink and caused insulation to melt) and what I needed was a continuity tester. My multimeter is bollocks for continuity so I knocked together my own:

I used a green 5mm LED, a 68 ohm resistor, two AA batteries, some banana sockets, and a bit of wire. I used my rotary tool with drill bit, burr, and countersink to score the holes in the case.

I used this LED Resistor Calculator to figure out the resistor rating (~50 ohms). I used my M328 Multi-Function Tester to figure out the forward voltage across my LED (it was 2.1 V, the default).

p.s. the cable under test was shorted! Turns out its a bad idea to put heat shrink tubing over electrical tape! And now we know.