We found this circuit in a 1977 National Semiconductor Databook. The circuit can use other FETs like the BF245 and has an input impedance of 10 megohms. The circuit gain is unitary.
This circuit was found in a 1994 publication. It draws 1 of 41 LEDs when we press and then release...
This traditional version of timer was found in an old English publication. The relay must be of a...
We found this configuration in a 1972 RCA linear integrated circuits manual. The transistor admits...