This circuit was found in a 1963 magazine, but can still be easily assembled with some current components. The diodes can be 1N4002 and 6 V x 50 mA lamps. The circuit tests rectifier and signal diodes of all types.

This circuit was found in a 1963 magazine, but can still be easily assembled with some current components. The diodes can be 1N4002 and 6 V x 50 mA lamps. The circuit tests rectifier and signal diodes of all types.