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.

Voltage Variator LM3900 (CB5057E)
In the figure we have a circuit that allows us to obtain a variable voltage of approximately 0.5 to 25 V...
Diode Bridge (MSB007E)
This circuit show the performance of a GraetzBridge or Diode Bridge usedin full-wave rectifers....
SFR Series of Anti Sulfur Resistors
May 2017 - The new ROHM SFR series anti-sulfur resistors can now be obtained from Mouser...