This circuit is from an Electronics World of 1968. The transistors are of the time and the power is supplied with a voltage of 40 V. The circuit is high fidelity.
This shield circuit was found in the Texas Instruments Linear Circuits Applications of 1986. The...
We found this circuit in a 90s 73 magazine for radio amateurs. The circuit has 3 W of power and can...
This small amplifier uses a loudspeaker as a microphone and can be used in a simple intercom. The...