This receiver uses old transistors that are equivalent to BC548 and BC558. The photo diode is of any type. The receiver can be used on a highly sensitive audio link.
The sensor of this circuit is a 2N3055 transistor from which the housing cover has been removed to...
The figure shows how to generate a 60 Hz clock signal for TTL circuits. The circuit is from Radio...
The circuit shown in the figure can generate signals of good intensity up to a frequency of 30...