We found this TTL circuit in a Texas Instruments optoelectronics manual. The power is 5 V and the LEDs are common.
Found in old documentation, this circuit can be implemented even today with the use of a 2N2646 for...
This circuit is from a 1981 publication. The DC supply can be made with voltages from 6 to 12 V...
This circuit was found in a 2005 Linear Technology application manual. The circuit is based on the...