This circuit can modulate a laser rate at frequencies of 50 kHz. We found the old documentation. The bipolar transistors can be the BD135 and 136 and the FET admits equivalent.
This circuit also detects IR, providing LED indication. The circuit is used to indicate humidity in...
This circuit uses a JFET, which may be of the type BF244 or BF245 and a PNP bipolar that may be...
This circuit can be used to directly control direct current loads or higher alternating current loads...