The diagram shows an AND gate implemented with an LM3900 transconductance operational. The circuit is from a manual of operational amplifiers from the 90's. The supply voltage must be made according to the logic in which the port will be applied.

The diagram shows an AND gate implemented with an LM3900 transconductance operational. The circuit is from a manual of operational amplifiers from the 90's. The supply voltage must be made according to the logic in which the port will be applied.