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 can be used in alarms by activating a relay or a current load that depends on the...
The circuit given below was found in the National Semiconductor Linear Applications Handbook. The...
The current of this circuit is determined by a PNP transistor. The circuit is suggested by Texas...