This direct coupled amplifier using 3 transistors and low voltage power was found in the April 1961 Radio Electronics magazine.
This CMOS circuit with the 4011 can be used in an infrared remote control. The circuit can be...
This circuit was suggested by Popular Elecronics from the 90's. The circuit has high input...
This circuit has a high input impedance and uses two transistors quite common in the market. Its...