Found in a 1968 American documentation, this circuit uses an operational amplifier that is uncommon today. The feed must be symmetrical. The gain is 40 dB.
This circuit was suggested in an article in Radio Electronics magazine in January 1992. Other...
This circuit is a little more elaborate with the previous one (CB19402E). The operational...
This circuit is suggested by the Optoelectronics Sourcebook by Texas Instruments when AC signals...