footswitch

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footswitch

Postby bamwels » 14 Sep 2010, 20:09

hi there!!!
i'm realy new out here, and i'm wondering if any one can help me...

i want to build my own footswitch for my hiwatt g40 12r amp.it has 2 mono inputs for channel and reverb and i want to build a footswitch with 2 leds.can any one help me with a wiring diagram please??
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Re: footswitch

Postby Hides-His-Eyes » 15 Sep 2010, 12:27

Does the amp want them Closed to engage the effect or Open?
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Re: footswitch

Postby bamwels » 15 Sep 2010, 12:31

to open
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Re: footswitch

Postby Hides-His-Eyes » 15 Sep 2010, 13:08

OK, use that to have a go yourself at drawing a circuit diagram and I promise I'll check it for you.
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Re: footswitch

Postby bamwels » 15 Sep 2010, 13:14

i don't know if i understand right but here is the thing: i don't know any thing about how to draw a diagram or anything about this stuff.sorry!!
can tou help me still??
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Re: footswitch

Postby Hides-His-Eyes » 15 Sep 2010, 15:48

Symbol for a switch:

Image

Symbol for an LED:

Image

Put a resistor in series with the LED to stop it burning out (depends on the LED, 1k is usually fine)

Image



Use lines to symbolise what wires will connect things! The switch symbol there is for a DPDT switch (google it) which are commonly available as footswitches.
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Re: footswitch

Postby bamwels » 15 Sep 2010, 16:27

it's right?
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Re: footswitch

Postby Hides-His-Eyes » 16 Sep 2010, 09:39

You need to seperate the LED and channel switching into individual 'poles' of the switch and then use a power supply or battery for the LED, probably.

There's no real guarantee what kind of signal/voltage the amp is going to send.
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Re: footswitch

Postby bamwels » 16 Sep 2010, 14:08

can you draw a diagram?? please!
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Re: footswitch

Postby bamwels » 16 Sep 2010, 14:10

for the channel the amp send 1.7V
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Re: footswitch

Postby Hides-His-Eyes » 16 Sep 2010, 14:23

Fiiiine, but you don't learn anything by me drawing it.

Image
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Re: footswitch

Postby bamwels » 16 Sep 2010, 19:14

thx man.it works :)
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Re: footswitch

Postby Hides-His-Eyes » 17 Sep 2010, 09:12

Well thank god for that ;)
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Re: footswitch

Postby Barcode » 17 Sep 2010, 21:12

bamwels wrote:for the channel the amp send 1.7V

If the amp sends 1.7V on the control line, there is a good chance you can use your original drawing with no additional power supply. It generally depends on the voltage of the LED used and how the switching actually takes place, but since you are shunting 1.7V to ground without the LED, I'm going to guess it is designed to provide power for the LED so you should be fine. You will most likely need to use a diffused plain old LED though, not a super bright or waterclear one.
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Re: footswitch

Postby DrNomis » 13 Oct 2010, 13:18

I'd suggest downloading a schematic of that Hiwatt Amplifier,then you would be able to work out all details of the footswitching from that,from how to power the led indicators,to how the footswitch sockets are wired,etc.... :)


From that,a schematic for a footswitching pedal for the amp,can be designed,there's nothing like referring to a schematic or service manual to gain wanted info.... :)
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