This 80's circuit has been winning. It is a 1 000 gain sample and hold circuit and an offset current setting. The configuration can be adapted to operate with modern equivalent components.
This simple oscillator with two general-purpose transistors has its frequency given by capacitor...
We found this circuit in the Linear Applications Handbook by National Semiconductor. The base is...
This is a very simple configuration with a power transistor to control a DC motor from 3 to 12 V...