We found this TTL circuit in a Texas Instruments optoelectronics manual. The power is 5 V and the LEDs are common.
This is one of many zero crossing detector that can be found in this section. It was found in...
In the figure we show a Varicap-controlled VCO capable of generating signals in the range of a few...
JFET This configuration, quite common in this section, was found in a 90s American documentation. The...