Suggested by General Electric in a 1965 publication this circuit uses a light bulb. Can be changed to use LED and capacitor can be 22 uF.
This simple test lets you measure zener voltage. The power must be higher than the diode tested...
The purpose of this modified astable is to make the initial pulses have the same duration as the...
Originally this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...