In order to prevent noise in the first working moments of the amplifiers and to prevent damage to the speaker, the control element is the standard in the sound systems π In fact, it can be called the timing circuit, but so far I have only used the amplifiers in a circuit that I have used in my circuits, as well as a few more delayed timer circuits
Our first circuit is a bit more complicated than other samples I installed on the LM741 Opamp, but I have tested in the PCB files
Circuit LM741 can set the pickup time relay board 10k TrimpotlarΔ± on the chart, you can use two balls got istersebiz a 12-volt relay Use Rule proper amperage by the power of your amp PCB File Speaker Delay Circuits
How it works
A speaker will be turned off by a relay in this circuit. The relay will then pull in the speaker to the output of the power amplifier after roughly 3 seconds. You will, as is customary, listen to music.
Here’s how to do it step by step.
It has a low voltage across it. Through R2, there is no bias current to Q1’s Base. As a result, Q1 and RY1 are ineffective.
C1 steadily charges current until it is fully charged. Then Q1 receives a bias current, and everything works. Pull two contacts together to drive a relay. Connect the power amplifier to the speaker.
C2 can be used to set the delay time. If a long time is required, extra capacitance is added. However, if the length is reduced, the capacitance of C2 is reduced.
