This oscillator uses a crystal to set the frequency. The operating limit of the unijunction is in the order of 100 kHz. Power supply can be between 10 and 20V.
This circuit triggers an alarm when the mains power is cut off. The circuit was found in the July...
This acutely tuned circuit was found in American documentation from the 1960s. The transistors are germanium...
This small AM transmitter was found in American documentation from the 1980s. Transistor support...