Short Wave Converter (T987E)

The conversion range of this circuit depends on the coil. The circuit uses two tubes, and the power supply is not provided.

Automatic range selector (CB21525E)
This circuit was found in a 1966 EEE. It is intended for automatic switching of the measurement range of...
Alarm for parallel sensors (CB6416E)
This circuit was obtained from a Popular Electronics of the 90s. The SCR is of any type and the...
Infrared Remote Control Receiver (CB18697E)
This is the basic receiver for the CIR12025 that consists of the transmitter. The circuit is...