I'm trying to make a circuit that operates like a car's signal light system using a 555 timer. I have the 555 working properly as I'd like. The signal coming out is ~4V, then goes through a SPST switch, which goes to the base leg of the transistor (NPN). Connected to the collector leg is a 9V DC source. The emitter goes to a 100Ω resistor, finally an LED, then to ground. All this works, the light flashes on and off as desired. However the voltage coming from the emitter doesn't seem to be right. I measured it with my voltmeter (bypassing the 555, constant 4.5V to the switch) and it's saying ~4V. Is 4 volts correct?
I'll try and make a schematic if I can KTechlab working again.
I'll try and make a schematic if I can KTechlab working again.