This circuit is from Delco Radio found in a 1968’s documentation. The transistors are of the time and are not given information about the driver transformer. Note the high supply voltage.
This circuit was found the Optoelectronics Sourcebook by Texas Instruments. Any phototransistor...
This traditional photodiode amplifier configuration uses an operational one that is no longer...
Figure bellow shows how one of the two separated counters found inside the 4518 is used as a...