We found this circuit in a French documentation from the 80's. The components used are still common and the circuit can generate signals from 10 Hz to 100 kHz.
The two circuits we suggest are from the book Optoeletronics - Theory and Practice by Texas...
This circuit was suggested by a 1967 Electronic Design. Modern equivalent transistors can be used....
Higher power for an operational amplifier can be obtained with a step with complementary output. The...