This very complex circuit in terms of the number of transistors was found in Radio Electronics from March 1966. The circuit is for low impedance headphones. The transistors are from the time.
This circuit, based on a 555, was found in a Popular Electronics from the 90s. The circuit has the...
This setting is valid for other transconductance operational amplifiers. The circuit is from...
This circuit is suitable for use in radio receivers to improve the quality of weak signal...