Obtained in MIT documentation, this 4-stage circuit has high gain for small signals. The power supply sources 150 V.
This circuit is from a 1987 magazine, but it can still be easily assembled, as the components are...
This circuit was found in a Popular Electronics from 1991. The transistor could be the BC548. The...
This circuit, which can be used to indicate the movement of an object, was found in NASA...