Electronics > Beginners
Loud Speaker?
ChrisGreece52:
--- Quote from: madires on May 30, 2013, 10:49:42 pm ---
--- Quote from: IanB on May 30, 2013, 10:13:49 pm ---Let's be realistic now. How much sound do you need to practice guitar with? It's all very well talking about 15 W, 25 W, etc, but that's a lot! As I mentioned before, battery powered radios can easily fill a room with sound, and there is no way you can get 15 W out of some little alkaline batteries.
Yes, a proper big hi-fi amp might need a big heavy transformer, but a little practice amp as a first electronics project? I think we need to get down to earth here.
--- End quote ---
A decent guitar amp has got about 15-30W and a quite large case (large speaker). If you want to keep the guitar amp small, i.e. using a smaller speaker, you'll need more power to compensate the size reduction. A big HiFi amp got much more power to be able to deliver a large dynamic range as required for listening to classic music. If you're looking for simplicity for a beginner there's not much difference between 5W or 150W, tons of inexpensive and simple amp ICs and modules are available.
--- End quote ---
Excactly i am looking for something basic but with ass little distortion as i can get ... :S
IanB:
--- Quote from: ChrisGreece52 on May 30, 2013, 10:59:07 pm ---Excactly i am looking for something basic but with ass little distortion as i can get ... :S
--- End quote ---
You know guitar amps are commonly designed to add distortion, right? (Albeit nice distortion, not horrible distortion...)
mariush:
--- Quote from: ChrisGreece52 on May 30, 2013, 09:40:21 pm ---ok but 30 watts??? thats sounds a lot ....
if i could find a transformer 12 volt it had to be 2.5 amps ... thats easy to find right ??? if i buy a 12 volt 3 amp power supply it would be more than enough to power it on !!!
--- End quote ---
--- Quote ---thats the first thing i came up when i searched 12 volt 3 amp
http://www.ebay.com/itm/36W-12V-AC-DC-Power-Supply-3-Amp-12-Volt-Adapter-LCD-3A-Charger-Laptop-5-5-2-5mm-/270881755391?pt=AU_Laptop_Accessories&hash=item3f11cf90ff
does it worth it or it will be crappy ?
--- End quote ---
MY GOD ..
I went through this 3 or 4 times already in this thread :palm:
12 V DC = +/- 6 V (±Vs) ====> 2-3 audio watts
It's pointless to get a 12v transformer even if it's rated for 2.5A because the tda2050 WILL NOT USE THE CURRENT it has available. It can only output 2-3 watts at that voltage.
You can use an ATX power supply with 40 Amps on 12v and it would still only make only 2-3 watts of audio.
YOU NEED LARGE VOLTAGE
A 24 V AC transformer will give you when rectifier 24 x 1.414 = 33.9v. With diode drops, you have 32V which is below the maximum of 50V the chip supports. 32 V DC = +/- 16v so on the graph that shows you it the amplifier will output about 13-15 audio watts there.
13-15 watts of audio is enough for a room and on par with the speakers you have.
To get about 13-15 watts of audio, the amplifier will waste about half of that as heat, so it would use about 20 watts.
madires told you that you can get up to 32 watts from this TDA2050 chip, but ONLY if it receives about 45-48 volts (close the maximum of 50v it supports). You can see that on the graph above. The output power has a direct relation with the input voltage.
A 24v AC 20VA will be enough for ONE CHANNEL (mono), 15 watts of audio max. If you'll want stereo, you make two copies of the amplifier and get a 40VA transformer or better.
I only told you about 12v in the first posts because it's a common voltage you have in your computer power supply so when making an amplifier, you could just connect it to the computer power supply and test it. This way you'd only get 2-3 watts of audio. After that, you could just get a big transformer when you have money (or when you find one), and then you have big output.
ChrisGreece52:
--- Quote from: IanB on May 30, 2013, 11:17:20 pm ---
--- Quote from: ChrisGreece52 on May 30, 2013, 10:59:07 pm ---Excactly i am looking for something basic but with ass little distortion as i can get ... :S
--- End quote ---
You know guitar amps are commonly designed to add distortion, right? (Albeit nice distortion, not horrible distortion...)
--- End quote ---
some nice distortion effect activated by a switch would be fine but its a bass guitar so it would not be vital but pretty fun to have :D
ChrisGreece52:
--- Quote from: mariush on May 30, 2013, 11:43:01 pm ---
--- Quote from: ChrisGreece52 on May 30, 2013, 09:40:21 pm ---ok but 30 watts??? thats sounds a lot ....
if i could find a transformer 12 volt it had to be 2.5 amps ... thats easy to find right ??? if i buy a 12 volt 3 amp power supply it would be more than enough to power it on !!!
--- End quote ---
--- Quote ---thats the first thing i came up when i searched 12 volt 3 amp
http://www.ebay.com/itm/36W-12V-AC-DC-Power-Supply-3-Amp-12-Volt-Adapter-LCD-3A-Charger-Laptop-5-5-2-5mm-/270881755391?pt=AU_Laptop_Accessories&hash=item3f11cf90ff
does it worth it or it will be crappy ?
--- End quote ---
12 V DC = +/- 6 V (±Vs) ====> 2-3 audio watts
It's pointless to get a 12v transformer even if it's rated for 2.5A because the tda2050 WILL NOT USE THE CURRENT it has available. It can only output 2-3 watts at that voltage.
You can use an ATX power supply with 40 Amps on 12v and it would still only make only 2-3 watts of audio.
YOU NEED LARGE VOLTAGE
--- End quote ---
I forgot about that to be honest sorry :( :P
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