Speaker Delay Circuit Diagram. Audio amplifier output relay delay. This is done in order to ensure that the dc blocking capacitor at the amplifier s output is charged before it is connected to the speaker.
The purpose of this circuit is to control the relay which turns on the speaker output relay in the audio amplifier. It has three wire power positive negative and ground. The circuit is a non inverting amplifier with the input biased at a reference voltage vref of of the supply voltage.
Ago you would see me try to show you a simple circuit.
By biasing the non inverting input at vref and capacitively coupling the audio the input voltage at the non inverting input will be equal to the audio waveform offset by vref. Shown below is the schematic of the diyaudio speaker delay and dc protector. To understand how it works let s divide the circuit to 4 sections. Why use the speaker protection circuit.
