Recommend a 2W, Class D mono for guitar - diyAudio
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Old 23rd November 2007, 12:50 PM   #1
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Default Recommend a 2W, Class D mono for guitar

Last evening, as we were parting from the relatives after Thanksgiving dinner, my nephew asked if I could repair his son's guitar amplifier -- the youngster has a Gibson which looks like Tiny Tim's ukelele -- the amplifier has a jack for a 9V wall wart so will probably have to put in a buck converter as most of the Class D amps are 2.5 to 5.4V with built in voltage boosters.

I would prefer not to have to use BGA or micro-SMD but SOIC is fine.

how many mV does an electric guitar pickup put out anyway?
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Old 23rd November 2007, 08:25 PM   #2
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Default Re: Recommend a 2W, Class D mono for guitar

Hi,

Can't help with the rest, but...

Quote:
Originally posted by jackinnj
how many mV does an electric guitar pickup put out anyway?
Based as a 20mV standard. Cheapies put out less, hot boutique pickups significantly more.

Cheers!
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Old 24th November 2007, 03:58 AM   #3
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hot pickups can go as high as 1.5vrms. average cheapo pickups usually in the 20-100mv range.
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Old 24th November 2007, 05:15 AM   #4
BWRX is offline BWRX  United States
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Jack, you've got a lot to choose from. There are parts from TI, National, AD, Maxim, Monolithic Power, etc. Just about any of them should be fine for a guitar amp.
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Old 27th November 2007, 05:27 PM   #5
Minion is offline Minion  Canada
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I know it isn"t Class D ,But if you only need 2w and want battery power you might consider useing the LM386 IC.... I believe they can put out 1 or 2 w and can be Paralelled and Bridged for more output power and they are easy to use and sound pretty good in guitar amps....and you can probably find some in 8 pin DIP...

http://cache.national.com/ds/LM/LM386.pdf
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Old 28th November 2007, 02:36 PM   #6
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-->jackinnj, do as Minion say (LM386 works in class B, it is not class D but will do the work ).

There is neat little guitar amp called "Little Gem mkII" - 9VDC power supply, two LM386 (in BTL).

Use LM386N-3 or LM386N-4, then You can squeeze 2W from it


http://www.runoffgroove.com/lgmk2-pcb.pdf

http://www.runoffgroove.com/littlegemMK2.png
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Old 1st December 2007, 05:10 PM   #7
Nordic is offline Nordic  South Africa
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Just finished a gem II... it is asoundingly loud, for such a low supply voltage
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Old 2nd December 2007, 11:14 AM   #8
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You can try the ¨Little Rebel¨ too, it sounds very good and the name is cool.

http://rebel.massberg.org/index.php
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Old 2nd December 2007, 01:53 PM   #9
getafix is offline getafix  Philippines
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or how about a noisy cricket by beavis audio

http://www.beavisaudio.com/Projects/NoisyCricket/DIY/
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Old 2nd December 2007, 08:37 PM   #10
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Nope, I am surrendering and gonna' use BGA -- TPA2010 -- they cost $1.55 -- filterless mono 2.5 watt and can run it off of a pair of "C" Cells.
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