Tagged Questions
0
votes
1answer
191 views
why will my transistor (TIP122) NOT switch?
My goal is to make a car turn signal flasher.
I used a 555 chip as the timer with the output driving a TIP122 transistor at BASE and a 100 ohm resistor between the BASE and the 555 output pin 3. The ...
0
votes
1answer
141 views
Drive relay when “key” is connected
I'm trying to design a circuit that will drive a relay (and thus turn on a bigger circuit) when the correct "key" circuit is connected.
The "key" is contained within the hashed box and functions as I ...
9
votes
4answers
461 views
Low power, low voltage, slow (0.1Hz) oscillator?
I had the opportunity to analyze a very interesting circuit today using a programmable unijunction transistor as a timer.
The power supply varies, and the circuit must operate on under 10uA of ...
