For my Systems and Control GCSE at School, I'm going to be making a unit with a speaker in it, basically where you can plug an mp3 player in through a 3.5mm jack and have the speakers output the sound (an mp3 dock, I know). I know I can't just run the signal right into the speaker, as it will be way to quiet, so how do I go about amplifying it?
I was thinking about buying some cheap iPod speakers from Argos or something, then taking the chip out of them and wiring it up to my own input. But I'd kind of like to do it myself.
So, how would I go about making the circuit? I've got basically anything I need at my disposable, so components aren't an issue. Plus I can get the correct PCB cut, and my teacher is awesome so I can get help from him if needed. The only reason I'm asking here is because he wasn't really sure.
Thanks.
Could i have some help as to what some of the symbols mean? I get the resistors, but what are all the triangles going to at the bottom? Also, what's that rectangle with the squiggly lines around it at the right?
[QUOTE=ButtsexV17;17414416][img]http://diyaudioprojects.com/Schematics/images/Mikael-Abdellah-SE-KT88-Amplifier.png[/img][/QUOTE]
Uhh, that's a tube amp, not exactly the cheapest or the easiest to build
Why the hell would you give schematics for a tube amplifier for something GCSE grade? - That's dangerous at best. My advice would be to build a chip amp.
Cheap, Easy and Hard to go wrong.
Triangles = Ground.
Squigly line thing = A Transformer, In this case it's an impedance matching transformer so you don't go frying the tubes.
Build a simple MOSFET Amplifier or do a chip amp.
8 Watt LM383 Chip Amp: [url]http://www.aaroncake.net/circuits/amp.asp[/url]
Relevent: [url]http://diyaudioprojects.com[/url]
[QUOTE=Tezza1234;17416958]Why the hell would you give schematics for a tube amplifier for something GCSE grade? - That's dangerous at best. My advice would be to build a chip amp.
Cheap, Easy and Hard to go wrong.
Triangles = Ground.
Squigly line thing = A Transformer, In this case it's an impedance matching transformer so you don't go frying the tubes.
Build a simple MOSFET Amplifier or do a chip amp.
8 Watt LM383 Chip Amp: [url]http://www.aaroncake.net/circuits/amp.asp[/url]
Relevent: [url]http://diyaudioprojects.com[/url][/QUOTE]
Thanks so much! That first diagram did seem a bit strange, I don't think I need to build a tube amp to amplify the mp3 player for some tiny speakers :D
EDIT: Out of interest, would it be safe to open up my old 15W MArshall guitar amp? I'd just like to see what's going on in there. I assume it's safe when it's not plugged in, but the capacitors could store a shitload of voltage? I don't know really. . .
It's not exactly safe, but nothing it could do would be fatal or anything.
[QUOTE=Epic Sandwich;17417578]Thanks so much! That first diagram did seem a bit strange, I don't think I need to build a tube amp to amplify the mp3 player for some tiny speakers :D
EDIT: Out of interest, would it be safe to open up my old 15W MArshall guitar amp? I'd just like to see what's going on in there. I assume it's safe when it's not plugged in, but the capacitors could store a shitload of voltage? I don't know really. . .[/QUOTE]
Turn it on without it being plugged in and it should discharge the caps enough to the point that they are safe to work with.
[QUOTE=Tezza1234;17418722]Turn it on without it being plugged in and it should discharge the caps enough to the point that they are safe to work with.[/QUOTE]
Thanks. If I try it, I'll probably be really careful anyway to not touch the board at all. Any more circuit diagrams to offer? I think the comments on that first one say that it's wrong. . .
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