This Linear Technology circuit can measure currents from 100 pA to 100 uA. The circuit is from the 80's, using a component of the era. Transistors are general purpose types.
The frequency of this unijunction oscillator is determined by the crystal whose maximum frequency is...
This circuit for an isolated instrument or multimeter can increase the sensitivity of your...
Found in a 1966 General Electric manual, this circuit provides a delay in starting. The motor is...