Found in Texas Instruments documentation from the 90's, this circuit can be used as a shield due its symmetrical power is 5 V. The circuit has offset adjustment and a pass band of 200 kHz.
Figure Bellow shows how to interface CMOS circuitos with TTL using the 4049 or 4050 IC. The power...
This circuit is from a manual from the 80's and the operational one used, uncommon nowadays, can...
Based on National Semiconductor's LM4130 reference circuit, this circuit was found in Internet...