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 low-power circuit uses, in the original version of 1965, germanium transistors. The...
This circuit was found in a 1989 publication. The operational amplifier supports equivalents. The...
This circuit from a 1967 publication turns a short pulse into a square signal whose duration...