Recommend a 2W, Class D mono for guitar

jackinnj · 23rd November 2007, 12:50 PM

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?

Geek · 23rd November 2007, 08:25 PM

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!

unclejed613 · 24th November 2007, 03:58 AM

hot pickups can go as high as 1.5vrms. average cheapo pickups usually in the 20-100mv range.

BWRX · 24th November 2007, 05:15 AM

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.

Minion · 27th November 2007, 05:27 PM

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

Cienfuegos · 28th November 2007, 02:36 PM

-->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

Nordic · 1st December 2007, 05:10 PM

Just finished a gem II... it is asoundingly loud, for such a low supply voltage

Andronico · 2nd December 2007, 11:14 AM

You can try the ¨Little Rebel¨ too, it sounds very good and the name is cool.

http://rebel.massberg.org/index.php

getafix · 2nd December 2007, 01:53 PM

or how about a noisy cricket by beavis audio

http://www.beavisaudio.com/Projects/NoisyCricket/DIY/

jackinnj · 2nd December 2007, 08:37 PM

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.

23rd November 2007, 12:50 PM	#1
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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?

24th November 2007, 03:58 AM	#3
unclejed613 diyAudio Member Join Date: Dec 2006	hot pickups can go as high as 1.5vrms. average cheapo pickups usually in the 20-100mv range. __________________ Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net spammer trap: http://www1284177414881.v-dc.net/

24th November 2007, 05:15 AM	#4
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	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. __________________ Brian

2nd December 2007, 01:53 PM	#9
getafix diyAudio Member Join Date: Jun 2003 Location: somewhere in Mandaluyong	or how about a noisy cricket by beavis audio http://www.beavisaudio.com/Projects/NoisyCricket/DIY/ __________________ forever dreaming of a better set-up...

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27th November 2007, 05:27 PM	#5
Minion diyAudio Member Join Date: May 2006	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

28th November 2007, 02:36 PM	#6
Cienfuegos diyAudio Member Join Date: Sep 2005	-->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

1st December 2007, 05:10 PM	#7
Nordic diyAudio Member Join Date: Sep 2005	Just finished a gem II... it is asoundingly loud, for such a low supply voltage

2nd December 2007, 11:14 AM	#8
Andronico diyAudio Member Join Date: Jun 2004 Location: Santos Lugares	You can try the ¨Little Rebel¨ too, it sounds very good and the name is cool. http://rebel.massberg.org/index.php

2nd December 2007, 08:37 PM	#10
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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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