Home
JAQForum Ver 24.01
Log In or Join  
Active Topics
Local Time 16:24 08 Jun 2025 Privacy Policy
Jump to

Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.

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

Author Message
MM_Wombat
Senior Member

Joined: 12/12/2011
Location: Australia
Posts: 139
Posted: 12:33am 08 Apr 2012
Copy link to clipboard 
Print this post

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
Copy link to clipboard 
Print this post

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
VK4MU MicroController Units
 
MM_Wombat
Senior Member

Joined: 12/12/2011
Location: Australia
Posts: 139
Posted: 12:52am 08 Apr 2012
Copy link to clipboard 
Print this post

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
Copy link to clipboard 
Print this post

No worries
JAYCAR Grrr
But that is a good AMP for the price.



VK4MU MicroController Units
 
Print this page


To reply to this topic, you need to log in.

The Back Shed's forum code is written, and hosted, in Australia.
© JAQ Software 2025