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Topics - joecool85

#181
Nelson posted this over at diystompboxes and said I could post it here.  The layout is unverified, but oh so cool.

http://cordova.asap.um.maine.edu/~raymondj/imagehost/stereoamp.pdf

http://www.diystompboxes.com/smfforum/index.php?topic=44275.0
#182
Nelson posted this over at diystompboxes and said I could post it here.  The layout is unverified, but oh so cool.

http://www.diystompboxes.com/smfforum/index.php?topic=44275.0
#183
Preamps and Effects / Chipamp preamp
April 07, 2006, 10:50:13 AM
Chipamps are designed so that they don't need a preamp, however, that is for when you are running a lineout from a computer, CD player etc.  This means that you need to get guitar signal up to that strength by way of a preamp.

So, here is what we need in a preamp:

- Gets us up to linelevel
- basic EQ (probably 3 band)
- protection, ex-someone pluging in AC power to the input
- input buffer of around 1m
#184
Amplifier Discussion / Heatsinks for your poweramp
April 05, 2006, 07:37:26 PM
First - Have a good power supply circuit and a big enough/proper voltage transformer
Second - Big heatsink, there is no such thing as too large of a heatsink

Proper heatsink size for two LM1875 chips, or one LM3886:


Overkill(which isn't a bad thing though):
#185
Schematics and Layouts / LM1875 Power amp schematic
April 05, 2006, 07:09:19 PM
Now hosted on ssg server.
#186




#187
The lm1875 makes a really killer 20w guitar amp!  I just tried it out and wow!  It only has as much clean headroom as any other 20w amp, but its plenty for practice.  Crank it up and throw on a distortion pedal in front of it, and damn!  Very much loud!  I wasn't expecting it.  But I guess it makes sense, with the right speaker even my 15w dean markley gets pretty loud.  Anyway, it would make a sweet practice amp power chip if someone is interested.  Brian is suppose to start selling PCBs for the lm1875 soon also, so you won't have to make your own or anything.
#188
Schematics and Layouts / TDA2003 practice amp
April 02, 2006, 06:43:12 PM


There is an easy to put together kit for this too: http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=320-214

I found it to be ok with guitar, but very poor with bass.  Quite frankly I like the Little Gem better though.
#189
Amplifier Discussion / TDA2003 bass amp
April 02, 2006, 06:40:30 PM
Well, my brother wanted a small bass amp, so I figured a TDA2003 circuit would work well...well, no.  It sucks actually lol.  Virtually no useable clean headroom, I would dare say the lm386 is better.  Its no looker either lol.





**edit**
I should say that it worked pretty well with guitar.  However, I like the lm386 better even though its not as loud.
#190
Preamps and Effects / Lets design a preamp!
March 31, 2006, 01:20:51 PM
Ok, so we are going to base this thing off from the K-20X preamp because its simple and has great tone.  But, we are going to ditch the OD for simplicity's sake, plus then people can add their own OD later, and we are going to add a buffer to the front.  Anyone want to throw up a quick schematic of their best idea for it?  If we get this thing looking good, we can get some PCBs printed up with ssguitar.com on them and sell them for cheap.
#191
Schematics and Layouts / Little Gem
March 31, 2006, 10:45:52 AM


Thank you runoffgroove.com!
#192
Amplifier Discussion / My little gems
March 31, 2006, 10:44:20 AM



My first little gem.  It runs on one 9v and is in a cheap treasure chest that I bought for $2 at a dollar store.  The 1/8" jack isn't a headphone jack, but an external speaker jack for my pot cab.






Here is my little gem clipper.  I can hook it onto my pocket and walk around playing guitar in my apartment.  No volume control, I just use the guitar's volume...and leave it all the way up anyway.  The switch on it goes from clean to OD.  It runs on 3xAA.

The schematic is available at runoffgroove.com and in the schematics section of the forum.
#193
Amplifier Discussion / My lm3886 power amp
March 31, 2006, 10:23:49 AM












The schematic for this is in the schematics section of the forum.
#194
Schematics and Layouts / lm3886 amp
March 31, 2006, 10:18:55 AM


**Taken from the lm3886 manual @ chipamp.com**
#196
Preamps and Effects / Pictures
March 27, 2006, 11:34:53 AM
Lets seem some stomp boxes

Here are some I've built:

5th Gear Overdrive



Volume


Fuzzface
#197
Schematics and Layouts / Dean Markley
March 25, 2006, 07:09:22 AM
All of the Dean Markley Legacy amp schematics are up at DM Docs

This includes the K20, K-20X and a fiew other favorites of mine.
#198
Schematics and Layouts / 5th Gear Overdrive
March 25, 2006, 07:07:55 AM
*** Old version seen below, new version here: https://www.ssguitar.com/index.php?topic=4795 ***

This is the first design I've finished.  It gives a good solid overdrive/distortion depending on how much you turn up the gain.

#199
Amplifier Discussion / What have you guys built?
March 25, 2006, 07:05:15 AM
I finished my TDA2003 amp yesterday (pics coming soon)

So here is my list

2x little gem (lm386 amp) 1/2w
1x TDA2003 5w
1x lm1875 2x20w
1x lm3886 1x50w

Eventually I may build a bridged parallel lm4780 which would yield 200w!!  But for right now 50w is plenty, that thing is loud!
#200
Preamps and Effects / Anyone good at making PCBs?
March 25, 2006, 07:03:05 AM
I have a preamp I want to do.  It is the preamp off a Dean Markley K-20X.

Here is the schematic:


I actually just need someone to make the PCB design, I was going to have 5-10 of them printed by a place online.