Operating at a frequency of around 180 kHz, this transmitter was found in a Science & Electronics of 1970. The coil has 34 turns of 22 wire. The transistor can be the 2N2222.
The circuit shown in the figure is characterized by stability and the use of a common component. This...
This small transistor amplifier was found in an ancient American documentation. Transistors can be replaced...
This circuit makes use of a thermometric sensor that heats or cools according to a current of air....