TheBackShed.com

Forum Index : Microcontroller and PC projects : New MaxiMite Sound Booster

Author

Message

DuinoMiteMegaAn
Senior Member

Joined: 17/11/2011
Location: Australia
Posts: 231

Posted: 09:21pm 09 Mar 2012

Copy link to clipboard

Print this post

Perfect for boosting the square wave/PWM audio out on the MaxiMite.

Mono Audio Amp Breakout - TPA2005D1 $7.95 USD
sku: BOB-11044

Sparkfun sales promotion ...
Sometimes, you want your creation to speak loud and clear. But the headphone jack output isn't always enough. Our new Mono Audio Amp Breakout gives you the extra power you need to be heard. It can produce almost 1.5W of power and is about the size of a quarter. You can easily power it from 3-5V, adjust the gain, and add even a pot for volume attenuation of the incoming signal. It makes for a fantastic small and efficient embedded amplifier.

BTW ... I don't work for Sparkfun

djuqa

Guru

Joined: 23/11/2011
Location: Australia
Posts: 447

Posted: 10:06pm 09 Mar 2012

Copy link to clipboard

Print this post

Nice Unit
But the Postage to Aussie maybe be a killer.

Similiar unit
LM386 Low Voltage Audio Amplifier Module Kit
$7.92 Postage Included.

or buy a set of powered speakers for PC's often get them for <10 Bucks

VK4MU MicroController Units

crackerjack

Senior Member

Joined: 11/07/2011
Location: Australia
Posts: 164

Posted: 12:01pm 10 Mar 2012

Copy link to clipboard

Print this post

Hi All - not to do advertising for free for anybody, but a certain cut-price German supermarket chain here in Aussie sells a 2.4W amp/speaker with built in Li-Ion batteries (rechargable via USB - plays continuously for about 6 hours). Costs around $8 and I see them for sale in the glass display cabinets at most of said supermarkets (at least around Melbourne). It works well for me, but a tip is to put a pot inline or the volume will cause family (and possibly neighbour) issues - there is nothing quite like a sustained 100 Hz square wave at 93 dB from out of the blue...

Edit: 93 dB was plucked from the air - I have no idea of the Watt/Decibel relationship of this device or the proximity you may have the device to your (or your neighbour's) ears.Edited by crackerjack 2012-03-11

mookster1
Regular Member

Joined: 10/06/2011
Location: New Zealand
Posts: 81

Posted: 08:49pm 11 Mar 2012

Copy link to clipboard

Print this post

I had an idea and I want to know if you guys think it will work. It involves using the sound output to send high-speed digital sound data to a DAC (with a serial-in/parallel-out chip in front of it) to have high-quality (not monophonic square wave) sound, loaded as say a WAV file off an SD card for instance.

To my understanding, the sound/PWM output can output a signal at 200KHz? This means 5us pulses, so for a sample size of 8 bits this allows for a sample rate of 25000 samples/sec, decent enough for MIDI style stuff.

What could I use to supply a 200kHz clock(in sync with the data) so the SIPO latch can reset itself after 8 bits/a sample?

Cheers

BTW Should've put this in a new thread... sorry!Edited by mookster1 2012-03-14

Capacitance is futile - roll on 2012!

DuinoMiteMegaAn
Senior Member

Joined: 17/11/2011
Location: Australia
Posts: 231

Posted: 09:11pm 24 Mar 2012

Copy link to clipboard

Print this post

Mono Audio Amp Breakout - TPA2005D1

Using this Sparkfun mono ampifier with the MaxiMite aka CGMMStick1 reproduced the "Ode to Joy" sound fairly good using this mono amplifier. The sound is too loud for earphones and headphones, you probably need an external volume control pot (3 pads on board) to reduce the sound and a 8 ohm 2-3 watt speaker (I was using only
3.3 VDC supply and the current draw was 110 ma.)

BTW ... There was one board member worried about shipping cost from the US and the only way to reduce this cost is to have several members buy in bulk. The shipping cost would be the same for 1 or 25 or even 50 due to the small size and low weight of this miniature SMT module.

DuinoMiteMegaAn
Senior Member

Joined: 17/11/2011
Location: Australia
Posts: 231

Posted: 07:26pm 02 Apr 2012

Copy link to clipboard

Print this post

BTW ... Littlebirdelectronics carries Sparkfun products in Australia.
http://littlebirdelectronics.com/search?q=amplifier
This amp down under is $9 AUD

Print this page

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