We found this circuit in an American publication from the 90s. It generates pulses that can be modulated in amplitude. The supply can be done by voltages from 5 to 12 V and the frequency depends on C1 and C2.
This pulse amplifier with optical isolator is from a Motorola manual from 1973. The transistors can be...
This circuit is from an 80's documentation. The BC108 can be replaced by the BC548 and the 2N3055...
This circuit is designed to obtain a negative voltage from a positive supply for circuit...