Electronics > Beginners

Loud Speaker?

<< < (13/18) > >>

madires:

--- 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 ---

Either you go for a tube amp or get a guitar pedal for that :-) There isn't any nice distortion with a modern amp. But you can add a "nice distortion" effect in the preamp-stages of the guitar amp. That's the common way used by most guitar amps.

madires:

--- Quote from: ChrisGreece52 on May 31, 2013, 08:23:48 am ---
--- Quote ---YOU NEED LARGE VOLTAGE

--- End quote ---
I forgot about that to be honest sorry :( :P

--- End quote ---

If you have no constraints for the PSU use higher voltages and split voltages (+/-), based on the amp IC or module you're using. If you have to use 12V go for a car audio amp IC, which is optimized to deliver more power at that low voltage. But use linear PSUs, no SMPSUs, because those give you a headache. They're much cheaper, but you have to add a lot of filtering (large and expensive parts) to make them usable for audio amps.

Back to Watts. For a bass guitar you obviously want to have a guitar amp with good bass. The first thing to consider is the human ear (see dBA http://en.wikipedia.org/wiki/A-weighting). There's a huge difference in loudness if listening to 1W audio with 1kHz or 100Hz. IanBs transistor radio with a decent speaker works fine for a midsized room as long as the audio is in the kHz range. But if you go down with the frequency you have to provide much more power to achieve the same loudness as the 1kHz signal got. Therefore you need a large speaker capable of providing a good frequency response down to the 30Hz you like to have. And you need some Watts to drive that speaker and to compensate for the dBs the speaker can't deliver and the dBA concept. If you use a more small-ish speaker you'll need more Watts and an adjustable bass booster. The latter would be a good idea anyway, also for a large speaker. And for audio mostly in the bass range a slighty oversized PSU is desirable, because a overdriven PSU doesn't let the amp give you nice bass. If you want 30W audio use an amp with >=50W. It's a bad idea to max out the power specs of the amp (increased distortion, bad sound and so on). That's all basic audio 101.

SeanB:
Distortion is easy, LM386 run till it clips.............

Or 2 back to back diodes and a low value series resistor with about 2Vpp of signal works as well.

ChrisGreece52:

--- Quote from: SeanB on May 31, 2013, 03:16:46 pm ---Distortion is easy, LM386 run till it clips.............

Or 2 back to back diodes and a low value series resistor with about 2Vpp of signal works as well.

--- End quote ---
yeah but lm386 is a crappy amp so i need something with more power.

madires:

--- Quote from: ChrisGreece52 on June 01, 2013, 10:30:56 am ---
--- Quote from: SeanB on May 31, 2013, 03:16:46 pm ---Distortion is easy, LM386 run till it clips.............

Or 2 back to back diodes and a low value series resistor with about 2Vpp of signal works as well.

--- End quote ---
yeah but lm386 is a crappy amp so i need something with more power.

--- End quote ---

I think he meant that you could use the LM386 as a preamp stage just to generate the distortion.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod