Found in Popular Electronics from the 90s, this circuit generates signals in a frequency range set to R7 and basically determined by C1. Operational and equivalent transistors can be used.
Using a CA3130 and a power transistor, this circuit can deliver a current of up to 500 mA with the...
This circuit is a variation of the common grid dip meter, having been found in a 1975 publication on FETs....
This circuit is from an American documentation from the 90s. The transistors are of power and must be...