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 small transmitter operates in the medium wave range. T1 is an output transformer for...
This circuit for 1 kHz sinusoidal signals uses a common operational amplifier circuit and is...
We can use this amplifier with low impedance headphones with good performance. Possible...