Electronics > Beginners
Loud Speaker?
madires:
--- Quote from: ChrisGreece52 on May 30, 2013, 09:41:54 pm ---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 ---
Better stay away from SMPSUs. Mariush suggested a 24V transformer, I second that. 24V 50VA should be a good choice.
IanB:
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.
ChrisGreece52:
--- 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 ---
Right i am sorry but i am figuring this out as i am going through ...... so we have new specs
NON portable
singe or dual signal
loud but not SO loud (medium sized room medium noise level.
Taking into account all the things you suggested above i wont need something more powerfull than 25 watts so we have that limit .
With this in mind i am looking for a power supply that it can output up to 30 watts (5 watts will be lost as heat right ? )
madires:
--- 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.
madires:
--- Quote from: ChrisGreece52 on May 30, 2013, 10:23:25 pm ---Right i am sorry but i am figuring this out as i am going through ...... so we have new specs
NON portable
singe or dual signal
loud but not SO loud (medium sized room medium noise level.
Taking into account all the things you suggested above i wont need something more powerfull than 25 watts so we have that limit .
With this in mind i am looking for a power supply that it can output up to 30 watts (5 watts will be lost as heat right ? )
--- End quote ---
30W power in and 20W audio out should be fine.
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