This amplifier with gains between 5 and 100 was found in the May 1988 issue of Radio Electronics magazine. The circuit requires a symmetrical power supply.
This General Electric circuit was published in 1970. The LED is infrared and the voltage according...
This circuit simulates a diode whose characteristics can be adjusted with a trimpot. The circuit is...
We found this circuit in an American documentation from the 60's. The transistors are made of...