# Best way to amplify this 1w 8ohm speaker

#### stevef22

Joined Oct 30, 2019
11
Hello! I have a 1w intercom speaker I want to amplify. Issue, I have no idea how much power is going to this speaker from intercom and how to step up power to accommodate a larger, more loud speaker. Any help much appreciated.

Attached is pic of small 1w speaker. I want it louder to a 1.5" speaker or 2" speaker.

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#### MrChips

Joined Oct 2, 2009
24,643
Welcome to AAC!

I have never seen a loudspeaker looking like that.
2" speaker seems rather small for any decent sound quality.

You are not likely going to get louder sound unless you replace or modify the amplifier.

#### stevef22

Joined Oct 30, 2019
11
Welcome to AAC!

I have never seen a loudspeaker looking like that.
2" speaker seems rather small for any decent sound quality.

You are not likely going to get louder sound unless you replace or modify the amplifier.
Thanks for the welcome! Its from a video doorbell. I took it apart and found this small speaker in there. Thinking of an inline micro amplifier to boost the signal to a louder speaker?

Goal is not boombox loud. Just loud enough to hear over heavy traffic in background. Think new york street.

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#### Papabravo

Joined Feb 24, 2006
17,314
Speakers are generally not capable of amplification. If you try to dump more audio power into them what you get is a mess of distortion.

#### MrChips

Joined Oct 2, 2009
24,643
A simple solution is to use an LM386 to amplify the signal and drive a more powerful speaker.
If you don't know how to do that just ask for help.

#### Papabravo

Joined Feb 24, 2006
17,314
A simple solution is to use an LM386 to amplify the signal and drive a more powerful speaker.
If you don't know how to do that just ask for help.
I wouldn't make any sizable bet that this would be an improvement. I might risk a coffee against this proposition.

#### stevef22

Joined Oct 30, 2019
11
Let me clear up question

Goal if possible:

Use the audio out of device and add a larger speaker (2" or 3"). I will build housing for upgraded speaker.

not just add amplification to current speaker, understand significant distortion would occur.

#### MrChips

Joined Oct 2, 2009
24,643
If you need more power you can look for a class D audio amp, for example one based on 5128 chip.
Search for 5128 amplifier on ebay.

#### stevef22

Joined Oct 30, 2019
11
A simple solution is to use an LM386 to amplify the signal and drive a more powerful speaker.
If you don't know how to do that just ask for help.
Thank you very much, found a youtube video on how to make one. : )

Joined Jul 18, 2013
23,949
Thank you very much, found a youtube video on how to make one. : )
The whole component kit with PCT board for $2.00 on Amazon. Max. Thread Starter #### stevef22 Joined Oct 30, 2019 11 The whole component kit with PCT board for$2.00 on Amazon.
Max.
Send link please! I looked and found many. LM386 VS 5128. What would you choose? I guess depends on how loud?

Keep in mind im wiring this to a doorbell. 24v ac 500ma

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Joined Jul 18, 2013
23,949

#### MrChips

Joined Oct 2, 2009
24,643
Be careful. If you do not have a clean DC power source your amplifier will be humming all the time.

#### AnalogKid

Joined Aug 1, 2013
9,500
Post #3 image - in the lower right corner is an 8-pin chip. What are all of its markings? It might be the speaker driver, and knowing what it is is a clue to the signal level you have to work with.

Separate from that, what is your power source for the external speaker amplifier?

ak

#### BobTPH

Joined Jun 5, 2013
4,053
If the speaker is indeed 8 Ohms, you might be able to get more volume by disconnecting it and connecting a larger speaker in its place.

Bob

#### stevef22

Joined Oct 30, 2019
11
Post #3 image - in the lower right corner is an 8-pin chip. What are all of its markings? It might be the speaker driver, and knowing what it is is a clue to the signal level you have to work with.

Separate from that, what is your power source for the external speaker amplifier?

ak
Chip looks like LED driver chip.

Power source is doorbell. Plan on making more than 1 so need filter to accommodate range of input. See attached pic for range.

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#### stevef22

Joined Oct 30, 2019
11
If the speaker is indeed 8 Ohms, you might be able to get more volume by disconnecting it and connecting a larger speaker in its place.

Bob
Thanks Bob will try this first

#### AnalogKid

Joined Aug 1, 2013
9,500
If the speaker is indeed 8 Ohms, you might be able to get more volume by disconnecting it and connecting a larger speaker in its place.
Depends on shat you mean by "larger". If you mean physically larger but with the same coil impedance, then yes, a larger speaker might be more efficient.

I don't think it has been confirmed that the speaker driver is a class D chip. If it is, many of them are designed for relatively low voltage applications, and can drive lower coil impedances safely (to increase the coil current and hence the output power). As long as you are trying different external speakers, try one with a 4 ohm coil.

Note: no warranty expressed or implied.

ak

#### BobTPH

Joined Jun 5, 2013
4,053
Yes, I meant physically larger 8 Ohm speaker. I suspect that tiny speaker is not very efficient.

Bob

#### stevef22

Joined Oct 30, 2019
11
Depends on shat you mean by "larger". If you mean physically larger but with the same coil impedance, then yes, a larger speaker might be more efficient.

I don't think it has been confirmed that the speaker driver is a class D chip. If it is, many of them are designed for relatively low voltage applications, and can drive lower coil impedances safely (to increase the coil current and hence the output power). As long as you are trying different external speakers, try one with a 4 ohm coil.

Note: no warranty expressed or implied.

ak

Thx trying physically larger speaker first.

Is there a way to measure the voltage coming from the device?

Its two wires, black and red.