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Nov 08 2008
By: spoocannon Lombax Warrior 115 posts
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Dual Bass Pedal circuit that works and a schematic that's readable!

16 replies 1232 views Edited Nov 8, 2008

 

Hey all,

 

I know this has been kicked around in this and other forums, but most of the information out there was confusing.  I just finished the circuit from imakeprojects(dot)com and it works pretty well.  I've tested it on RB1 and RB2 with no real issues.

 

Yes, there are a couple of companies selling these types of devices for around $30 bucks, but I'm cheap and I like building things.  Hopefully this may help some of you that are thinking of building one or having troubles getting yours to work.

 

Here's the original schematic from  imakeprojects(dot)com:

 

Original Schematic

                       Click to embiggen.

 

Here's a schematic I made in Flash that is less technical and easier for novices like me:


 My schematic

                                          Click to embiggen.

 

 

Here's my completed circuit running off of an A/C 9 volt wall-wart instead of a 9 volt:

 

 My completed circuit

                                         Click to embiggen.

 

I found most of the parts in misc. PC cards and broken electronics around my house. The only things I had to buy were the prototype board, 120 Ohm resitor and the 74HC14 IC chip (got them all from Jameco(dot)com).

 

Below is the parts list and where I acquired each piece:

 

Parts list:

 

(3) Diodes (1NRs)  - Scavenged from a dead VCR

(1) 5 volt Relay - Removed from a Modem PCI card

(3) Stereo female jacks - Removed  from a SoundBlaster ISA card

(4) 10k Resistors (BROWN BLACK ORANGE GOLD) - Found in a dead USB mouse

(2) 50 volt 10uf CAPS - Removed from a dead AM/FM tuner

(1) 16 volt 220uf CAP - Found on both the VCR and tuner

(1) 2N3904 Transistor - Melted off of an ancient BrookTree TV PCI card

(1) LM7805 Voltage Regulator - Found on both the SoundBlaster and the BrookTree cards

(1) 120 OHM resistor (BROWN RED BROWN GOLD) - Gave up looking and bought from Jameco

(1) 74HC14 Hex Inverter IC Chip - Bought from Jameco

(1) 14 pin chip holder - Left over from another project, bought at RadioShack

(1) Ciruit Board - Buy from Jameco or RadioShack

(1) A/C Jack (optional) - Pulled from a cordless phone charger

(1) A/C Transformer (optional) - Used for the same phone

(1) 9 volt clip with wires - Murdered alarm clock

(1) Stereo 3.5mm male to male cable - Came with an LCD PC monitor for the speakers

(2) Drum pedals - 1 OEM  and one from that $20 dollar Hit Pack or whatever it was with the crappy silencers and plastic sticks

Misc Wires - Removed from a dead USB mouse's cable

 

If you don't have all this stuff, you can get buy pretty much enough to make at least 4 from Jameco for about $30 bucks shipped. Make some for your friends.

 

Last thing to do is put it in some sort of case. It's a bit big for the Altoid universal case. The Shack sells project boxes for a few bucks that could work. You can also try swapping the two diodes before the transistor for low volt/draw LEDs for some added bling.

 

Hope this helps somebody out. Questions, suggestions, proofing of circuit welcome.

 

- spoo

 

 

Message Edited by spoocannon on 11-08-2008 07:04 AM
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Lombax Warrior
Registered: 01/02/2008
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Re: Dual Bass Pedal circuit that works and a schematic that's readable!

Nov 8, 2008
If I knew how to kudos you'd get one from me. great post.
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Wastelander
Registered: 07/08/2008
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Re: Dual Bass Pedal circuit that works and a schematic that's readable!

Nov 8, 2008
amazing
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Fender Bender
Registered: 01/05/2008
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Re: Dual Bass Pedal circuit that works and a schematic that's readable!

Nov 8, 2008

i know an easier way.

you know those headphone splitters for a dollar?

buy those and use that

it works fine thats how i do it 

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Fender Bender
Registered: 10/19/2007
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Re: Dual Bass Pedal circuit that works and a schematic that's readable!

Nov 8, 2008

ps3rocks1992 wrote:

i know an easier way.

you know those headphone splitters for a dollar?

buy those and use that

it works fine thats how i do it 


 

Does it work on RB1 drums?
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Lombax Warrior
Registered: 04/12/2007
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Re: Dual Bass Pedal circuit that works and a schematic that's readable!

Nov 8, 2008

ps3rocks1992 wrote:

i know an easier way.

you know those headphone splitters for a dollar?

buy those and use that

it works fine thats how i do it 


Same here. I wouldn't have thought of doing it any other way.

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Wastelander
Registered: 06/17/2007
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Re: Dual Bass Pedal circuit that works and a schematic that's readable!

Nov 8, 2008

Jedisrus wrote:

ps3rocks1992 wrote:

i know an easier way.

you know those headphone splitters for a dollar?

buy those and use that

it works fine thats how i do it 


Same here. I wouldn't have thought of doing it any other way.


 

Once you experience true double bass, you'll realise how much your missing out on with a simple splitter.
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Treasure Hunter
Registered: 05/15/2007
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Re: Dual Bass Pedal circuit that works and a schematic that's readable!

Nov 8, 2008

ps3rocks1992 wrote:
Jedisrus wrote:

ps3rocks1992 wrote:

i know an easier way.

you know those headphone splitters for a dollar?

buy those and use that

it works fine thats how i do it 


Same here. I wouldn't have thought of doing it any other way.


 

You guys obviously don't leave your foot down between notes. A splitter would never work for me.

 

To the OP: Kudos for you. Great write up.

Message Edited by Whetzel on 11-08-2008 04:12 AM
____________________________________
Got the YLOD? You're not alone, but I can help.
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Lombax Warrior
Registered: 12/14/2007
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Re: Dual Bass Pedal circuit that works and a schematic that's readable!

Nov 8, 2008

The_PoopteT wrote:

ps3rocks1992 wrote:

i know an easier way.

you know those headphone splitters for a dollar?

buy those and use that

it works fine thats how i do it 


 

Does it work on RB1 drums?

 

Yes, it works on my RB1 drums.

 

As for the headphone splitter method, I tried that immedatiely after getting my second drum pedal. I find it un-natural to play with both pedals "up". 

 

This circuit allows you to play with one down, both down and any combination of hits you can think of.  imakeprojects(dot)com has a vid on YouTube showing what you can do with it. See it here.

 

The ciruit pretty much controls the switches in the pedals and allows for it to send a signal once for each trigger closure. With the headphone splitter, as soon as one of the pedal's switch is closed, the circuit is closed. That will not allow for the other pedal to register.  I learned alot while making the circuit and testing each component path while you go was kinda fun. I'm probably wierd though thinking this was fun.

 

   

 

 

 

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Wastelander
Registered: 06/17/2007
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Re: Dual Bass Pedal circuit that works and a schematic that's readable!

Nov 8, 2008

So to clarify, this works on both RB1 and RB2 sets?  I question this because there is a difference somehow between the two.  The original Twin Rocker double bass adapter only works with RB1 drums.  They had to make a new one for the RB2 drums.  Though I'm unaware if the newer one is fully functional on the RB1 set.

Now going off topic here....Since you have electronics savy, could you look into a splitter that would work for the cymbals.  Some people wish to have 2 crashes and basic splitters don't accomplish this.  I've tried myself with several including...

2 mono to single mono

2 mono to singel stereo

2 stereo to single stereo

Twin Rocker 1

Twin Rocker 2.

None of which worked. 

So far what we know of the wiring is that the cymbal jacks on the RB2 set are in fact stereo,
they're just wired unconventionally. The Piezo to stereo connection MUST be wired as follows:
Piezo red to stereo ground.
Piezo black to stereo negative.
The positive stereo element goes unused.

Now I'm uncertain if the velocity feature would factor into this if the line was simply split.  It may dull the sensitivity on one or both of the cymbals, is what I'm saying. 

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