I'm working on a little project(an infrared jammer) and I'm having a few issues.
Why (and how) exactly do circuits like the one below use electrolytic capacitors? Wouldn't ceramic capacitors be suitable for this?
Also in the NPN configuration, why are the LEDs placed with the collector and not the emitter?
If I were to make the frequency variable by using a potentiometer in place of the 39K resistor would the duty cycle change as well as the frequency?
I'd appreciate any help! Thanks.