This circuit that can amplify signals from 0 to 30 MHz was found in a 90s Popular Electronics. Transistors admit current equivalents. The input impedance is high.
This simple speed control for 3 to 15 V motors uses a common power transistor. The circuit was...
This circuit came out in a publication called Electronics Handbook of 1993. The circuit shows how...
This is a general purpose pramplifier launched in Brazil by Philips in the years 70. The BC549 is...