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Forum Index : Microcontroller and PC projects : Audio amp question.

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MM_Wombat
Senior Member

Joined: 12/12/2011
Location: Australia
Posts: 139
Posted: 12:33am 08 Apr 2012
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Ok, Probably off topic in micro controllers..

I have a recordable message card, with a 0.5watt external speaker that I wish to increase the volume on.

I found a 1 watt , 1 transistor amp on the net..

http://sci-toys.com/scitoys/scitoys/computers/solderless/amp lifier.html





My question..

Will this amp blow the speaker? and I need to get a better speaker.

or if I change the 100 ohm resistor to 50 ohm then speaker will survive.
[edit] Schematic has 50 ohm, but project was built with 100 ohm [edit]
The output from the card will be a fixed volume, but just louder than the standard volume..

mm_wombatEdited by MM_Wombat 2012-04-09
Keep plugging away, it is fun learning
But can be expensive (if you keep blowing things up).

Maximite, ColourMaximite, MM+
 
djuqa

Guru

Joined: 23/11/2011
Location: Australia
Posts: 447
Posted: 12:48am 08 Apr 2012
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Should work ok with existing speaker.
Although the LM386 AMP project would be a better design.
LM386 Based Audio Amp kits are everywhere on Net for little money.
Pre-Assembled LM386 AMP Module $8Edited by djuqa 2012-04-09
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MM_Wombat
Senior Member

Joined: 12/12/2011
Location: Australia
Posts: 139
Posted: 12:52am 08 Apr 2012
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That was the next project from the sci-toys website, and would use less power. as the device would be powered by battery's , that would be more desireable..

with the added bonus of adjusting the gain and sending the bass signal back for re-amplification.

thanks Djuqa


[edit] Jaycar has one for 9.95 KG9032 [edit]
MM_WombatEdited by MM_Wombat 2012-04-09
Keep plugging away, it is fun learning
But can be expensive (if you keep blowing things up).

Maximite, ColourMaximite, MM+
 
djuqa

Guru

Joined: 23/11/2011
Location: Australia
Posts: 447
Posted: 01:07am 08 Apr 2012
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No worries
JAYCAR Grrr
But that is a good AMP for the price.



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