This circuit for very low frequencies was found in an American documentation from the 90's. Transistors are for general use and the frequency depends on C1 and C2.
This circuit is from the 80's, making use of components of the time. What the circuit does is...
Suggested by Motorola documentation from the 1980s, this circuit uses power transistors from the...
This is stage is transformer coupled and was found in na old publication of the year 1958. The...