This LED diode test is suggested by the Texas Instruments optoelectronics manual. The transformer current can be between 50 mA and 300 mA and the voltage between 6 and 9 V.
This simple signal injector oscillator was found in a 1981 documentation. The coil can be made...
September 2017 - Würth Elektronik High Power Ultraviolet LEDs can be obtained from Mouser...
This circuit works as a variable transformer that measures the power applied to a 110 V load (and...