Hi all,
I'll apologize in advance for seemingly newbie question. I've looked around at various examples of these switches and still can't quite get my head around the way to wire it so any help would be heaps appreciated.
I'm powering a ph pre amp, with 4x9v batteries in series running into a step down putting out 24v into two pcb boards one for each channel.
Now I want to route power through an on/off switch based on a 12v led push button power switch. I am abit lost on what is the best way to wire it in to the amp.
I've attached a pic of the pins on the switch and also a basic diagram of the amp.
If someone could please provide feedback on how best to wire it for on/off operation with LED on/off in line with power being on/off.
Really appreciate feedback thanks guys
Sent from my 486 IBM WIN 3.1x Desktop...
I'll apologize in advance for seemingly newbie question. I've looked around at various examples of these switches and still can't quite get my head around the way to wire it so any help would be heaps appreciated.
I'm powering a ph pre amp, with 4x9v batteries in series running into a step down putting out 24v into two pcb boards one for each channel.
Now I want to route power through an on/off switch based on a 12v led push button power switch. I am abit lost on what is the best way to wire it in to the amp.
I've attached a pic of the pins on the switch and also a basic diagram of the amp.
If someone could please provide feedback on how best to wire it for on/off operation with LED on/off in line with power being on/off.
Really appreciate feedback thanks guys
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Sent from my 486 IBM WIN 3.1x Desktop...
Hi there! 🙂
Generally with these switches that have an on/off indicator you would use one set of contacts on the switch to supply power, and the other just for switching the led light.
Because the voltage you are switching is 24v you need to use a resistor or a 12v voltage regulator to step down the 24 to 12v to power the led without burning it out.
In this case it seems the easiest way to do it would be to wire the led in parallel across one of the preamps (with a resistor in series of course.) and then use the two sets of contacts to switch power to the two amps. That way when the switch is set one way the indicator will light, the other way and it will turn off, and you don't have to waste a set of contacts just for switching the led!
Just out of interest is there a special reason why you are using 9v batteries? They are very expensive and cannot supply much current for extended periods at all, in most cases you would be better off using 12v SLA's as they can supply more current you can recharge them as well! 😉
Post up some pics too, sounds like an interesting project! 😀
Generally with these switches that have an on/off indicator you would use one set of contacts on the switch to supply power, and the other just for switching the led light.
Because the voltage you are switching is 24v you need to use a resistor or a 12v voltage regulator to step down the 24 to 12v to power the led without burning it out.
In this case it seems the easiest way to do it would be to wire the led in parallel across one of the preamps (with a resistor in series of course.) and then use the two sets of contacts to switch power to the two amps. That way when the switch is set one way the indicator will light, the other way and it will turn off, and you don't have to waste a set of contacts just for switching the led!
Just out of interest is there a special reason why you are using 9v batteries? They are very expensive and cannot supply much current for extended periods at all, in most cases you would be better off using 12v SLA's as they can supply more current you can recharge them as well! 😉
Post up some pics too, sounds like an interesting project! 😀
Hey Spooner
Thanks for your reply mate appreciate your feedback. So if I'm reading you correctly.
From the battery I would wire the positive to NC1 and negative to common1 (c1) on the out to amplifier I would take positive from nc2 and negative from c2 both the positive out of nc2 and c2 common will be split out to two wires, the second positive holding appropriate resistor and going to the LED + at the top and the secondary negative (ground) going to bottom negative !!!???
Is that correct???
Yeh mate I did consider going SLA but I wanted the option to run up to 26-27v so in that case I thought I would need 3x SLA batteries so I decided just to go batteries. If it was staying under say 22v I think I definitely would have gone SLA, but your right I should probably relook at it!
It's a passive phono amp and will definitely post some pics when I've got the puppy together hopefully by the weekend 🙂 I'm running it through a little LCD controlled voltage reg I got of Ali which seems to work pretty well 🙂
Appreciate your help mate
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Hi hyped! 🙂
You are on the right track but I think perhaps you mistyped something? Because if from the battery you connected the positive wire to NC1 and the negative to C1 then when the switch is closed you have a short circuit! 😱
Now I'm guessing that you want both amplifiers to turn on at once, here is how I would do it if that is the case.
Connect the positive terminal from the battery to C1. You do not need to switch the negatives at all so just connect the negative battery terminal straight to the step down, and connect the negatives from both amplifiers to the -ve output terminal on the stepdown.
Now connect a wire to NO1 and use this wire to supply power to the step downs positive input terminal. Now connect both amplifiers in parallel to the output of your step down. (The negatives are already done so just run both the positives back to the 24v out.)
As for the led, using the 24v supply from the output of your stepdown, you need to make a 12v supply. You could calculate the correct resistor to use but a really easy way to do it is to simply get a voltage regulator like the 7812 and wire it up to step down the voltage to 12v. Then just connect the led+ and led- terminals to your 12v supply and you are done! 😀
As a side note you always want to make sure when using batteries with step down converters that any on/off switch disconnects the batteries directly instead of only the switching the output of the stepdown. The reason is that if you don't directly disconnect the step down from the batteries when the circuit is off then it will drain them because even if nothing is connected to the stepdown's output it will be dissipating heat and using current from the batteries converting the voltage down!
I have drawn a diagram too if it helps, I wish I could make nice ones on the computer like you have though, what program did you use to make them? 😀
And looking forward to seeing some pics!
You are on the right track but I think perhaps you mistyped something? Because if from the battery you connected the positive wire to NC1 and the negative to C1 then when the switch is closed you have a short circuit! 😱
Now I'm guessing that you want both amplifiers to turn on at once, here is how I would do it if that is the case.
Connect the positive terminal from the battery to C1. You do not need to switch the negatives at all so just connect the negative battery terminal straight to the step down, and connect the negatives from both amplifiers to the -ve output terminal on the stepdown.
Now connect a wire to NO1 and use this wire to supply power to the step downs positive input terminal. Now connect both amplifiers in parallel to the output of your step down. (The negatives are already done so just run both the positives back to the 24v out.)
As for the led, using the 24v supply from the output of your stepdown, you need to make a 12v supply. You could calculate the correct resistor to use but a really easy way to do it is to simply get a voltage regulator like the 7812 and wire it up to step down the voltage to 12v. Then just connect the led+ and led- terminals to your 12v supply and you are done! 😀
As a side note you always want to make sure when using batteries with step down converters that any on/off switch disconnects the batteries directly instead of only the switching the output of the stepdown. The reason is that if you don't directly disconnect the step down from the batteries when the circuit is off then it will drain them because even if nothing is connected to the stepdown's output it will be dissipating heat and using current from the batteries converting the voltage down!
I have drawn a diagram too if it helps, I wish I could make nice ones on the computer like you have though, what program did you use to make them? 😀
And looking forward to seeing some pics!
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Spooner, legend mate thanks heaps for taking the time to draw it out for me really appreciated. Stopped me from scratching my head which already was drawing blood 🙂
Seemingly a simple thing I guess but I just couldn't get my head around the contacts!
Got me out of pickle owe you one! I'll be sure to post pics of outcome thanks to your input 🙂
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