This differential amplifier, found in a 1964 Electronic Design, has a gain of 30. The setting can be applied to modern equivalent transistors.
This circuit was found in a Radio Electronics of July 1984. It consists of the traditional 1 A...
This circuit is from a 90's Radio Electronics. The circuit operates accurately up to about 15 kHz...
I found this circuit in an old British magazine from 1976. It is possible to test operational...