Deluxe stereo audio amplifier kit
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Posted by
Ned
on
Oct 10th, 2011
what would be the best way to house the drivers? im talking air space behind them. dampening material. that sort of thing?
Response by
geoffhampson
on
Oct 10th, 2011
With this kit it is obviously important to mount the speaker in to a case so that as the cone moves in and out the air is forced forwards. If you don't put it in a box then the air just moves around the edge of the speaker and the sound is very poor. In terms of the design of the enclosure you’re not really going to notice much difference between just mounting the speaker against the case and trying to calculate spaces, baffles, damping etc. If you make the case too thin so that the back of the case touches the back of the speaker then there won’t be any air behind the speaker. As long as the case is 50mm deep then it should sound fine, making it larger will only help, but I suspect you would struggle to hear the difference. If you had a set of speakers to cover the frequency range and they were higher powered then the design of the speaker housing would become more important. If you search on speaker design there are loads of websites that go in to all the theory.
Posted by
Kieran
on
Apr 23rd, 2012
Hi,If the circuit is being powered by 12V mains, do you need to remove the battery temporarily to avoid damaging the circuit (combined voltage being 21V)?
If so, would putting in a two way switch or just a switch to disconnect the battery be alright?
Cheers.
Response by
geoffhampson
on
Apr 23rd, 2012
The DC jack socket also contains a switch, such that as the jack is connected the PP3 clip disconnects. This means that it is possible to run off batteries and leave these in place, but as soon as power is connected to the DC jack it runs from the power supply.
Posted by
Trevor
on
Jul 30th, 2012
How long will this product run off of a 9V battery? (typical run-time)
Response by
geoffhampson
on
Jul 30th, 2012
Running from a 9V battery at full volume the battery will last about 2 hours. If the volume is lower it will last longer. Some alternatives and the number of hours at full volume are listed below:3x AA, 2.4 days (max power 0.4W)
3x C cell, 4.8 days (max power 0.4W)
4x AA, 1.2 days (max power 0.75W)
4x C cell, 2.4 days (max power 0.75W)
6x AA, 19 hours (max power 2W)
1x PP3, 2 hours (max power 2W)
Please note although some of the options at the top of the list offer longer battery life the maximum power and therefore maximum volume will be lower.
Posted by
beardy
on
Sep 12th, 2012
Does the TDA2822M get hot? If so, would a heatsink be a good idea?Many thanks
Response by
geoffhampson
on
Sep 12th, 2012
There will be some heat generated by the IC, however it won’t be that much. The IC is likely to be warm / hot to touch depending upon volume but even at full volume doesn’t require a heatsink.
Posted by
Jamar Walker
on
Dec 3rd, 2012
can this be connected using a USB cable into my computer?
Response by
geoffhampson
on
Dec 3rd, 2012
At 5V the amp will use about 150mA so will be OK on the computers USB port. Please note however the lower the operating voltage the quieter the music can be played. At 5V you will get about 0.5W per speaker.
Posted by
Callum smith
on
Mar 11th, 2013
Just wondering is it possible to integrate a switch where the jack lead would go so it is possible to swap from 3.5mm jack to ipod cable with just the flick of a switch
Response by
AaronSturman
on
Mar 11th, 2013
Yes it is possible to integrate a switch to do that. I would recommend using a slide switch. You would attach the ground lead of both the 3.5mm jack and ipod lead to the common of the switch then one positive lead to each of the remaining terminals. Then connect the other side of the common connection on the switch to the negative terminal on the PCB and both of the other terminals on the switch to the positive terminal on the PCB.Hope this makes sense!
