In the figure we have a basic shield circuit with TTL to TTL optical isolator. For the emitting LED the voltage can be different from 5 V.
Found in American documentation, this circuit for modulated infrared signals can be tuned to a...
This circuit makes use of components from the time it was published. The TCA151 is not a common...
Found in American documentation from the 1960s, this circuit employs power transistors of the...