prakdrive

It's years old. I know it, I just cannot remember what it's called or who performs it and it's driving me batty.

Why can't you use this frequency within 100km of Charing Cross? Presumably somebody else uses it.........but who? Nobody I've asked seems to know. Anybody any clues?

I've got the above multimeter in my Christmas stocking and it claims to be able to do inductance. Unfortunately it gives me readings where ever I stick the dial and not the same ones either. The manual is no help, and I'm wondering if anybody out there has cracked how to work it.

This is something I've never thought of before, but does a battery have a maximum instantaneous current that it can provide? i.e. a maximum number of amps per second (or whatever time period) regardless of its mAh rating? If so, how can I calculate this?

So, I want to make an amplifier for watching TV so a hard-of-hearing person can watch without blasting the rest of the family out. I've got two electret condensor microphones and I know that one end needs to have a supply voltage, and the second pin has an audio output/ground connection. What I don't know is where this goes in a simple amplifier. The amplifier can be OTL, transformer or direct coupled, but can anybody point me in the direction of some good schematics please?