This circuit is intended for use with common oscilloscopes having been found in documentation on instrumentation from the 1970s. The capacitors are of the ceramic type with low parasitic inductance.
This is a possible circuit for the receiver of the previous circuit. Other circuits can be found...
This small transmitter with 2 transistors can reach several hundred meters using a 30 to 70 cm...
Using the 4001 integrated circuit, this latching relay can employ any general-purpose transistor. The...