Code practice neon oscillator (T430E)

Found in a 1938 Radio handbook, this circuit must be connected to the input of a good amplifier. Other similar versions can be found on this website.

LC Oscillator (CB4552E)
This oscillator can produce 2 to 10 MHz signals depending on the coils used. The transistors can...
Home Security System (CB4804E)
In the figure we have a security system consisting of a sophisticated alarm found in a 90s edition...
15 V x 1 A Power Supply Using the LM723 (CB862E)
The output voltage is adjusted by the trimpot. The power transistor mist be mounted on a heatsink. The 3.9...