1940s commercial receiver (T1618E)

This receiver was found in a Radio Electronics from 1949. It is a superheterodyne of the time using 6 tubes.

LZ400UB00 Series of Violet LEDs
August 2017 - The new LZ400UB00 ultraviolet LEDs from Engin LEDs with wavelengths of 385 -410 nm...
Shift register (CB5302E)
This circuit with PUT was found in a 1980s documentation. The component used is uncommon and the...
800 Hz Sine Oscillator (CB25580E)
In this phase shift circuit, the transistor can be any general-purpose transistor. The circuit is from...