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Adding a volume control to some speakers

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BadMouth:


--- Quote from: markronz on September 19, 2011, 10:01:05 am ---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?

--- End quote ---

Aren't the top speakers stereo?  Bad things could will probably happen to the amp if you ran the stero leads together!

If they are mono, or you only used the leads from one side, then it could be ok. 
If you try it that way though, wire the speakers in series (+ lead to speaker +, then - from that speaker to + on the other speaker, then - from the 2nd speaker back to the - lead).  It will put less of a load on the amp than wiring them parallel.

Personally, I'd just use the thing as it was intended.
If the sub is too loud, buy another L-Pad or see my comment above about wiring an 8ohm cement resistor in line with it.

leapinlew:


--- Quote from: markronz on September 19, 2011, 10:01:05 am ---
--- 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.

--- End quote ---

Thats how my machine was. The way I solved my volume problem was to sell the machine.

markronz:

The volume knob look GREAT!  Thank you so much BadMouth!  For the time being, I think I'm going to leave the lower speaker as is.  Might have to find a resistor in the future, but we'll see. I'll cross that bridge when I get to it.  Thanks again everyone for all the help!

venom:

Hi, from the uk   :)

Looks like a good forum., I  used this before for groovymame when I configured my mame/neo geo cab. Anyway I have just bought a  thunderbords 3 pachisl.  I understand that the humming noise is quite normal, but even setting the volume switch to lowest actual gameplay is too loud.  Reading this post I amgoing to try an l-pad. No radiosahck over here and also need help with the correct way to install. Hope is ok to re-open post ?

Right found what I think I need a l-pad  15 watt 8 ohm STEREO .

Does this look right

http://www.ebay.co.uk/itm/SPEAKER-L-PAD-STEREO-Part-Number-LP-200-8-/271197271977?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item3f249df7a9

I cant quite understand the way to wire it though  even from this

http://www.arnscott.com/PDF/Installation%20Sheets/L-PAD%20Stereo%20Installation.PDF

Its the top second picture I want to wire as its got two speakers in it.

I understand that I can cut the + wire to each speaker and put the wire  to  the two pin 3's. I can then run a cable from pin 2's to the + of the speakers to complete the circuit. I cant quite understand what I do with the common from the amp do I attach that to pin 1 then also put a cable from pin 1 to the - of the speaker. I.e pin 1's will have two wires soldered to it.  There are supposed to be some l-pads with screw terminals but I cant find any.

Appreciate help as never even played on the machine or know much about them before i bought it !




Drnick:

Cut the ground lead, take a wire from Pin 1 and connect the 3 ends together.  You can use a butt connector (Halfords) or a connector strip (Poundland) to keep it neat (2 ends of ground wire in 1 side, wire from pin 1 in the other).





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