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Adding a volume control to some speakers

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BadMouth:


--- Quote from: markronz on September 13, 2011, 09:46:09 am ---Both of those I got from radio shack were listed as "audio/volume controls" so that is why I thought they might work.

--- End quote ---

That just means they aren't linear in how they taper.
Never buy those as replacements for the pots in arcade controls!  :lol

Seriously, if you are in the US, shoot me a PM with your address and I'll put this L-Pad in the mail tomorrow.


darthpaul:

I am using L-Pads on my Pachinko machines and MAME cabinet to control volume,http://www.parts-express.com/pe/showdetl.cfm?Partnumber=260-260 they are the way to go. You may want to check out this site for any other questions you may have http://www.pachitalk.com/forums/.

Blanka:

Aren't those L-pads getting hot? If you turn down 50watt to say 2 watt, a lot will be converted to heat.
I bet there must be an option for the line-signal too, I even expect a small screwdriver pot on the PCB. A sound amp chip is pretty easy to locate on the board. They often have a little heat dissipation unit attached.

BadMouth:


--- Quote from: Blanka on September 18, 2011, 10:16:35 am ---Aren't those L-pads getting hot? If you turn down 50watt to say 2 watt, a lot will be converted to heat.

--- End quote ---

Yep, that's how they work.  The farther you turn down the L-pad, the warmer they get.
I doubt these machines have 50w amplifiers in them though.

I sent markronz the spare one I had.  It's rated for 50w per channel.
As long as he sets the sound on the machine to the lowest level first and doesn't turn the L-pad all the way down, I doubt it will get any hotter than slightly warm to the touch.

It's something to check though, before you close the machine up and forget about it.





markronz:


--- Quote from: Blanka on September 18, 2011, 10:16:35 am ---Aren't those L-pads getting hot? If you turn down 50watt to say 2 watt, a lot will be converted to heat.
I bet there must be an option for the line-signal too, I even expect a small screwdriver pot on the PCB. A sound amp chip is pretty easy to locate on the board. They often have a little heat dissipation unit attached.

--- End quote ---

I swear there is no other volume control on this pachislo machine besides the two dip switches on the PCB.   But like I said, they do not lower the volume enough.  From everything I've read, this is common on these machines.


--- Quote from: BadMouth on September 18, 2011, 11:05:45 am ---Yep, that's how they work.  The farther you turn down the L-pad, the warmer they get.
I doubt these machines have 50w amplifiers in them though.

I sent markronz the spare one I had.  It's rated for 50w per channel.
As long as he sets the sound on the machine to the lowest level first and doesn't turn the L-pad all the way down, I doubt it will get any hotter than slightly warm to the touch.

It's something to check though, before you close the machine up and forget about it.

--- End quote ---

Yeah I will definitely keep my eye on that, and won't turn down the sound all the way.  I just got back from the weekend yesterday and I did receive your L-Pad BadMouth!   Thank you so much again for sending that.   And it does look even easier to hook up than the other L-Pad's I've seen online.   + / - in and out and that's it, just like you said.  Should be a cinch!

I will hook it up soon and let you know how it works.  But before I do, I had one question.  Like I mentioned, there's three speakers.  8Ω 10W on the two top speakers, and it says 8Ω 20W on the bottom speaker.   What would happen if I wired the two 10W top speakers both up to channel 1 on your L-Pad you sent me, and then the 20W bottom speaker to the Channel 2 on the L-Pad?  Would that work?  Or would that just be bad news?   Like I said before the bottom speaker does the base sounds, and it might be ok as is without adjusting the volumes, but it might not.   So I guess I was just wondering if it was even a possibility to hook it up like that, or if I should keep it one speaker per channel?

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