This modulator circuit was found in an American documentation from the 90's. The circuit uses a low power LASER diode. Power is supplied with 12 V.
This circuit was found in documentation two years 80. Transistors can be modern equivalents. Or...
This circuit, very critical due to the frequency at which it operates, was found in an American...
This stereo circuit with the 2002 integrated circuit. The power is 6 W per channel with 16 V of...