The selected circuit is from the Texas Instruments optoelectronics manual. With it you can receive optical signals in CW. Transistors support equivalents.
Using a 4046 PLL this circuit generates rectangular signals in three wavebands that depend on the...
The circuit shown is from the 1994 Linear Applications Handbook by National Semiconductor. The...
With this circuit it is possible to control two LEDs of different colors, making their color...