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how do i build a device to control volume of 4 differant speakers effectively?

so i just got a recever from a friend of mine but the master volume control is shot. in order to adjust the volume you need to shove the vol knob into the device and twist it hard so i want to build a simple device that has 4 individual volume knobs (1 for each channel)
what parts do i need to buy to do this

* ive seen llights that light to the sound of music how much would it be to buy these parts from radioshack
https://www.instructables.com/id/Blinking-LEDs-to-Music/

another thing i forgot to mention  is in the front it has 2 switches (1 for 1 left and right channel and another for another L/R channel) but they wwill not work at the same time why?

i still need to put outputs on my guitar amp and i need to know how to do that
i dont know if this helps but both guitar amp and receiver are 8 ohms

Picture of how do i build a device to control volume of 4 differant speakers effectively?
jvc.jpg
passive preamp.jpg
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NachoMahma7 years ago
> in order to adjust the volume you need to shove the vol knob into the device and twist it hard
.  That sounds to me like it's the actuator, not the pot, that is bad.
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> in the front it has 2 switches (1 for 1 left and right channel and another for another L/R channel) but they will not work at the same time why?
.  It sound like the switches are for turning on/off two sets of speakers. (hard to tell from your description.) You must have both sets hooked up for it to work properly.
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> i still need to put outputs on my guitar amp
.  Please explain further. Exactly what do you mean by "outputs"?
fastcar123 (author)  NachoMahma7 years ago
well what happins is when you turn the pot you feel where its supposed to stop however it doesnt it turn 360 when it not built to do that sorry i forgot to metion that the 2 switches are off/on switches therfore you should be able to turn front on AND right but only one at a time wotks(when both are in the on position no sound comes out of anywhere by outputs i mean a 1/4" jack embeded in the wood of the amp that i can plug a plug into however unlike a phones jack this "line out" lets the speaker in the amp continue to work i hope this information works
> supposed to stop however it doesnt it turn 360
.  If that is a problem, just replace the pot. Ohms and wattage (this is a signal pot, so watts shouldn't be an issue) should be stamped/printed on the pot body. It will probably be an audio taper.
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> should be able to turn front on AND right but only one at a time wotks
.  I dunno.
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> this "line out" lets the speaker in the amp continue to work
.  There will be a mechanically operated switch(es) on the jack that opens up when the plug is inserted. Short out the switch(es).
fastcar123 (author)  NachoMahma7 years ago
ive studied the pot but its unlike anything ive ever seen normaly its on a bread board and has about 9 muticolor wires coming from that board the pot has double contacts and has a red led in the center to light the knob the wires are unlabeled and no help to me . sorry that supposed to say front and rear. well the person i got it from sayed that1 of the channel amps blew out even though i tried all channels and have seen no errors maybe this is what he was talking about . ive examied the amp inside and out but i would not know what the switch would look like because its not on the actual jack. and by short it out you mean disconnect it because wouldnt it be if i shorted it out that the speaker would never run? or am i way off here
> the pot has double contacts
.  That may be a rotary encoder instead of a pot.
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.  The switch on the jack opens when the plug is inserted to cutoff the speakers.
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.  Without a picture or diagram, I'm doing a lot of guessing.
fastcar123 (author)  NachoMahma7 years ago
it is in fact a pot but i cant show pictures because i dont have ways to put picture from my phone on the computer ok so when the switch is closed power runs to the speaker and the jack but you dont hear the jack because nothing is there ok that makes sense
. Without a wiring diagram/schematic, I can't tell.
fastcar123 (author)  NachoMahma7 years ago
im sorry i couldnt find any schematics on either of them aparently its alot harder to find then i imagined which mean i hoave n choice but to use my old idea would 100K pots work for signal after it has been amplified to drive speakers of will i blow out the amp or speakers? or would i need heavier pots the store has 5k-10k-50k-100k-100k double poled-500k-1M which would be the best pot?
.  I'm not really sure what you are trying to do, but I think it's going to require resistors/pots in the megohms to tens-of-megohms range
.  As long as you start off with the volumes at minimum, you should be able to listen for distortion and shutdown before any damage is done..
fastcar123 (author)  NachoMahma7 years ago
i drew a schematic for the volume controller and found a picture of the recever
. Your drawing is what is often called an attenuator. I'm guessing that you would be better off using a voltage divider arrangement instead of your "brute force" method, but I'm no expert.
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.  Instead of opening the input to turn it off, short it (or the outputs). This will result in lower noise levels when that channel is turned off. If you open the circuit, your wiring becomes an antenna.
fastcar123 (author)  NachoMahma7 years ago
how do you build a voltage divider- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- would a votage divider lower overall volume? - - - - - - - - - - - - - - - - - - - - - - - - - -- how exactly is this "brute force"?- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - so i short the output from the amp? but i heard that on any amp that a short circuit could blow the amp very quickly i must have misunderstood you- - - - - - -
voltage divider

.  Yeah. I was thinking you were using a preamp output. Shorting a power amp is not a good idea.
fastcar123 (author)  NachoMahma7 years ago
what if i used a device like the third piture shown would that work it is a passive preamp (*it looks like when the signal goes to the switch left channel and right channel merge but they do not sorry i didnt mention that)
. You need to go ahead and buy a 6-channel mixer. All your jury-rigging is only going to introduce hum and distortion.
fastcar123 (author)  NachoMahma7 years ago
im sorry no that i look back at the piture it does get confusing the input on the device is the output from the receiver the output on the device is what happins after the pots