Transformerless push-pull amplifier for radio receivers

This universal speaker amplifier delivers a NF power of more than one watt to an 8 ohm speaker. The frequency response is designed for voice reproduction, so that the circuit is well suited for use in radios or radio receivers. With the mute connection, the audio output can be suppressed and thus a squelch can be realized.

The structure of such an amplifier with manual wiring is shown on the left. It is part of a do-it-yourself radio. On the right the structure of an amplifier of this type in the form of a compact assembly.