The purpose of this circuit is to improve a trigger circuit using a zener diode. The circuit was found in an American documentation from 1964. It can be improved using equivalent modern components.
This traditional crystal radio circuit was obtained from a 1990 documentation. The diode can be...
Other operational amplifiers of the same family can be used in this circuit suggested by Motorola in...
This configuration is from Texas Instruments technical documentation. In it we have the way to use...