This small signal amplifier circuit was found in Motorola's 1969 documentation. The FET and the transistor can be of any type and is battery powered since the consumption is very low.
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...