So I used my new cables in anger. I took a reading of the current draw on 300in1 project 155 that I was working on the other day. Will be able to experiment with the effect of using different resistors (and none at all).
So I did a circuit. This is a diode/transistor logical OR gate. I’m learning. What I’d like to understand is why the resistors are necessary and why are the resistor values picked such as they are? I’ve asked a question about this over on the EEVblog: What is the purpose of the resistors in this schematic?.
I made some notes about my 300in1 diodes. I have switching diodes, rectifier diodes, zener diodes, and germanium diodes. One thing to note is that germanium diodes are supposed to have a forward voltage of 300mV. One diode I thought was a germanium diode (it was clear with two black bands but no other markings) had a forward voltage of 600mV, I’m not sure what’s up with that, so I put it in my “unknown parts” drawer.
I think this is just so super duper cool:
