This diagram was found in the November 1972 issue of Radio Electronics magazine in an article describing benchtop equipment. The transistors are of the time and the frequencies are given by the coils.
This circuit was found in an Elektor from the 90s. The circuit is critical, requiring a very...
This circuit using an operational amplifier was found in old American documentation. It can be...
The relationship of values between R1 and R2 determines the reference voltage for this circuit that...