Found in a 90s Hands On Electronics, this small preamp finds applications like microphones and other sources. Its gain is 3 dB with a response of 120 to 20 000 Hz.
Two operational amplifiers are used in this source obtained in an American documentation...
This circuit is suggested by the Linear Applications Handbook of National Semiconductor, being used...
This simple circuit for headphones or small speakers was found in documentation from the 90s. The...