Amplifier for low sensitivity DIY mods | Easy & Cheap

**Malchom** · Posted: Fri Jan 30, 2009 4:54 am Post subject:

So I was gone on vacation for about a month, hence the lack of a full update
and the final result. I started another thread to show off the finished set, and added a picture to this thread to show what a finished circuit looks like hooked to my set.

http://rockband.scorehero.com/forum/viewtopic.php?p=314162

It's working very well, needed minor adjustments that could only be done through trial and error but it was all well worth it!
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DIY sensor amplifier circuit | DIY drum rack | My DIY edrum kit | My mesh head RB1 set

**Adsee** · Joined: 06 Nov 2008 Posts: 606 Location: Somewhere in NJ

Would something like this work on a stock RB2 set? No mods at all?

**Malchom** · Posted: Wed Feb 18, 2009 6:09 pm Post subject:

**nothing110** · Joined: 06 Oct 2008 Posts: 9

Did you have any trouble getting this to work off the 5V usb? I used the LM324 instead and it works fine with a 9V battery but for whatever reason it won't work with the usb power.

**Malchom** · Posted: Tue Mar 03, 2009 3:08 pm Post subject:

Mine is getting all it's power from the USB 5V

Make sure your ground is grounded and that the current is going in the right direction

A voltmeter is your friend too :P
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DIY sensor amplifier circuit | DIY drum rack | My DIY edrum kit | My mesh head RB1 set

**nothing110** · Joined: 06 Oct 2008 Posts: 9

I've pretty much given up on this for the time being. I put the circuit together and it was just didn't work how I wanted it to. I couldn't tell if it was a sensitivity issue or a design issue, but if I hit one pad all of them would trigger. I could blow on it and it would go off. I don't know if you came across anything like that.

So, for the time being I put my old heads with neoprene back on and will eventually get a RB2 set for the mesh heads. I'm just tired of screwing with it for now.

**Malchom** · Posted: Tue Mar 03, 2009 3:25 pm Post subject:

Yah i have come accross that issue, you need to make sure your resistors a set accordingly.

I can set my heads so they detect anything, i have a huge gain range, going from 1 to 50 maximum. Now that it's done, it's overkill because most of my heads are set very near a gain of 1 :P

I had the issue when i had inversed my resistors and the circuit would just amp signal ridiculously high because the gain was all wrong. if you are sure your resitors are set correctly, and amp is ridiculous, try lowering the gain set very low as close to 1 as possible...

I understand frustration electric circuits can bring, I stopped on my circuit a while before starting to work on it again and a lot of testing came into play before actually making the final circuit. So many things can go wrong, faulty components, bad soldering joints, wrong placement, etc...

Getting a voltmeter (analog, with a needle is better) is extremely important so you can see how much amplification is applied and test without endangering your set, console and at the same time making it a lot faster to test than hitting the pads and see results on the game or computer.

EDIT : I forgot you cant go below 1 in gain... after 2 months i forgot all the theory already :P
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DIY sensor amplifier circuit | DIY drum rack | My DIY edrum kit | My mesh head RB1 set

**Echarin** · Joined: 21 Sep 2006 Posts: 19

The pictures accompanying the guide aren't showing. Any chance of them being uploaded again?

**Malchom** · Posted: Mon May 25, 2009 1:21 am Post subject:

Hum, it seems I forgot to pay for my domain name renewal....

Fixing it ASAP
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DIY sensor amplifier circuit | DIY drum rack | My DIY edrum kit | My mesh head RB1 set

**Malchom** · Posted: Mon May 25, 2009 1:36 am Post subject:

Fixed!
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DIY sensor amplifier circuit | DIY drum rack | My DIY edrum kit | My mesh head RB1 set

**GRNDPNDR** · Joined: 01 Mar 2012 Posts: 1

Any chance you're still around and have these pics? I'd really like to see them so I can build this. I bought an LM358 and I have 2x10K resistors just to test it with but I can't seem to get it to work and i'm using a 12V input for now.

I can even host the pics if need be

**lenr** · Joined: 16 Oct 2012 Posts: 1

Hi, i have triggers which are too soft, anyone perhaps have a copy of the schematics mentioned in the original post, i just a simple amplifier (pre-amp) to boost the output from the triggers.
Or if you have built something similar, please let me know.
Thanks