Using red LEDs with ignition voltages of the order of 1.5 V we can make a multiple voltage reference. Current is low.
This tuned circuit was found in a 1966 Electronic Circuit Handbook. The transistor can be any...
This circuit was found in Ferranti's 1974 transistor manual. Transistors are general purpose types...
This circuit was found in a Popular Electronics from 1991. The transistor could be the BC548. The...