Simple speaker delay circuit

I recommend you to make a Simple speaker delay circuit.

Imagine you finished a normally OCL power amplifier. Every time you turn on within the first 3 seconds. You may hear sound “tlub…” on a loudspeaker.

You feel annoyed that sound, right? Important, this sound is a high spike voltage. It can damage the loudspeaker.

How it helps us?

This circuit is a delay time to turn on-off your speaker.

The easiest basis of principle. While we turn on a power amplifier. The speaker delay circuit will disconnect the speaker.

It waits for the spike voltage lost before. Then it connects a speaker in normal again.

Ago you would see me try to show you a simple circuit. This too.

See in the circuit below.

How it works

We use 12V power supply from the power amplifier system like this.

A relay in this circuit will cut off a speaker before. Then, Time passed for about 3 seconds, the relay will pull in the speaker to the output of the power amplifier. You will listen to music normally.

speaker delay circuit

Here is the step-by-step process.

The voltage across it is low. No bias current to Base of Q1 through R2. So, Q1 and RY1 do not work.

PCBWAY-ElecCircuit3

C1 slowly charge current until full. Then, Q1 gets bias current, it works. To drive a relay pull two contacts together. Connect the speaker to the power amplifier.

The delay time—we can set by C2. If need a long time adds more capacitance. But if shorter reduce the capacitance of C2.

Try it.

What is more?

I am so happy to see you develop yourself. See!

 

Monitor turn-on delay circuit—Keep safe when power outage. The similar principle uses transistor too. But it uses a direct AC mains with a transformer so small and cheap.

30 minutes timer—Learn basic timer using transistor easy but long time delay.

Time Delay Circuit using MOSFET–Try using MOSFET easy and long-time than transistors.

5-minute time delay—Using NAND gate IC digital. I love it.

Power supply protection

Parts you will need

Q1: CS9013 NPN transistor
C1: 100uF 25V Electrolytic
C2: 100uF 16V Electrolytic
R1, R2: 33K 0.25W 5% Resistor
D1, D2: 1N4007 or 1N4001 Diodes
RY1: Relay 12V coil, 2 Contact 5A or 10A

Which is this circuit suitable for the amplifier types?

  • Low watts normal OCL amplifier lower than 30 watts. Although low power but can kill a small speaker.
  • Without speaker protection.—the common this one has built-in this speaker delay function.
  • Not for OTL amplifier

Look: the loudspeaker protection circuit project

Get Ebook: Simple Electronics Vol-03

Get Updates via Email

We always try to make Electronics Learning Easy.

3 thoughts on “Simple speaker delay circuit”

      • is there a box already made to hook up 3 ac at once , i have jbl 2 monitors plus the subwoofer, i have to use 2 extenson boxes with a switch, i turnon the sub woofer box and after sub is on, then i turnon the 2 other speakers which are attached to another extension box to do it manually… is there a box already made that i can purchase

        Reply

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.