This circuit was found in a 1980s documentation for amateur radio. The circuit makes use of components of the era, but modern equivalents can be used.
We found this circuit in an American publication from the 1990s. Any FET can be used. The circuit...
This circuit can be used as an optical switch or photosensor to excite TTL logic. The transistor can be...
This sensitive circuit was found in a Texas Instruments optoelectronics manual. The transistors can be...