footswitch

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bamwels
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Post by bamwels »

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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Hides-His-Eyes
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Post by Hides-His-Eyes »

Does the amp want them Closed to engage the effect or Open?
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bamwels
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Post by bamwels »

to open

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Post by Hides-His-Eyes »

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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bamwels
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Post by bamwels »

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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Hides-His-Eyes
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Post by Hides-His-Eyes »

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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bamwels
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Post by bamwels »

it's right?
Attachments
diagram.GIF
diagram.GIF (3.51 KiB) Viewed 135 times

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Hides-His-Eyes
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Post by Hides-His-Eyes »

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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bamwels
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Post by bamwels »

can you draw a diagram?? please!

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Post by bamwels »

for the channel the amp send 1.7V

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Hides-His-Eyes
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Post by Hides-His-Eyes »

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

Image
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bamwels
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Post by bamwels »

thx man.it works :)

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Post by Hides-His-Eyes »

Well thank god for that ;)
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Barcode
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Post by Barcode »

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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DrNomis
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Post by DrNomis »

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.... :)
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.

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