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 is the power supply circuit for the amplifier in the previous circuit. The source is...
This version operates in the opposite way to the previous one, triggering when light falls on the...
The sensors in this circuit are NTCs and PTCs that work in a differential way by directly...