Found in Popular Electronics from the 1990s, this variable frequency circuit generates signals in the shortwave range. FETs admit equivalents.
We find this circuit in a 1976 NASA handbook. The circuit can be designed based on current logical...
In the circuit shown in the figure when we press S1, capacitor C1 charges slowly, and with that it...
This circuit is from a 1968 Motorola power circuit manual. The circuit uses transistors of the...