7-segment display driver (CB20551E)

We found this circuit in English documentation from 1996 for PCs. The circuit is for common cathode display.

Active Antenna (CB4750E)
This good gain antenna up to 30 MHz was found in an American 1990s documentation. The circuit can be...
Temperature Sensor (CB6022E)
This circuit was obtained from an 80s factory manual. The integrated circuits used are uncommon...
12V x 220V Inverter with 555 II (CB1297E)
The critical component of this circuit is the transformar. We found it in an 1980s documentation....