Fast inverter (CB20757E)

Found in documentation from the 1970s, this circuit can be implemented with other operational amplifiers. The power supply must be symmetrical.

5 to 3 V switching regulator (CB8169E)
Found in a publication by National Semiconductor, this circuit provides an output voltage of 3.3...
Optical Coupler Shield - I (CB1325E)
This shield can be used both to interface TTL circuits and microcontrollers. The resistor in...
RIAA 3-Transistor Equalizer (CB1371E)
This circuit was found in a Japanese documentation of the 70's. It uses transistors of the era and is...