Need switching circuit

You may think you have explained what you need, but you haven't.

Please elaborate a little bit. For example, what do the switches do when they are not de-activated?

Are you trying to build something like a Jeopardy trigger where the first person who presses the button gets to answer in the form of a question?

--Mac

This is for an audio circuit. When deactivated, the switches will simply bypass a section of the circuit. THe switches will be spaced several inches apart. Almost like the jeopardy trigger, except pushing a button activates that button and switches off the other 2. I'm thinking I may need to do it with relays and logic circuits.

This is an audio circuit using 3 footswitches. 2 switches activate or bypass circuitry in the signal path (section 1 and section 2). Again, when activated each switch will deactivate the other 2. The 3rd switch bypasses all the circuitry when activated and deactivates the other 2. Think of it as a straight audio path with input>section 1 >section 2

I'll see if I can put a block diagram together today and post a link.

Sounds like he may simply want an equivalent of those interlocked pushbutton switches so commonly used as source selectors.

Graham

Use a BASIC STAMP.

Here's a diagram of the circuit:

Anytime one of the switches is closed, the other 2 should open. I know it looks a bit redundant, but it's for a friend and that's how he wants it. He wants to just be able to hit a switch and go to that setting. To make it more difficult, each switch will have an LED that lights to indicate the active switch.

Here's a diagram of the circuit:

Forgot to mention that in order to make more difficult, each switch has an LED to indicate active status.

Here's the basic switching idea:

Switch 1 open (LED on) causes Switch 2 to open and Switch 3 to close (LEDs off) Switch 2 closed (LED on) causes Switch 1 to close and Switch 3 to close (LEDs off) Switch 3 open (LED on) causes Switch 1 to close and Switch 2 to open (LEDs off)

Switches 1 and 3 need to be double pole to completely disconnect the sections from the audio path. I guess Switch 2 could simply be a cancel switch, causing Switches 1 and 3 to close.

Here's a diagram of the circuit:

Made a mistake in stating my needs.

Switch 1 - open (LED on) equals switch 3 closed, switch 2 open (both LEDs off) Switch 2 - closed (LED on) equals switches 1 and 2 closed (both LEDs off) Switch 3 - open (LED on) equals switch 1 closed, switch 2 open (both LEDs off)

I guess Switch 2 could be a cancellation switch that causes 1 and 3 to close. Switches 1 and 3 would need to be double pole switches to disconnect the sections entirely from the audio path when they are closed.

This is a device for his guitar. When not in use (Switch 2 LED on), there will be a straight path thru the device for the signal with no other circuitry bleeding off tone. I think that's about as clear as mud.

I read in sci.electronics.design that GoatBoy wrote (in ) about 'Need switching circuit', on Sun, 2 Oct 2005:

You may quite possibly not need to do that. You need to tell us exactly what is being switched. For example, is one signal switched to any one of three points or are three signals to be switched to one point? Does one switch have priority over the others or do you want it so that any switch that is ON has to be set to OFF before another switch can be set ON?

If you can do a simple ASCII art diagram here, or put a graphic on a.b.s.e., showing the basic switching without the interlock feature, that would help a great deal.

"You say that, "Anytime one of the switches is closed, the other 2 should open.""

Yeah, I said that but I was wrong. Switches 1 and 3 are closed when switch 2 is closed. Been a long and busy weekend.

"Does he have a couple of [guitar] effects that he wants to engage with foot switches, like hit switch 1 and effect 1 comes out, hit switch 2 and effect 2 comes out and hit switch 3 and both effects (or neither) come through? Inquiring minds want to know!-) "

That's exactly it, but at no time should both effects be working. Switch 3 (switch 2 in the diagram) would simply be a bypass switch for the entire device. Once either effect switch is engaged the bypass switch would open.

I haven't meant to be so vague. You just put it in better words than I did. For that, I thank you.

John, You had it right. I need 2 switches, one for each effect. Engaging one effect turns the other off. There is also a 3rd switch, a bypass switch which turns both effects off but can be cancelled by engaging one of the effect switches. Each switch has an LED to indicate active status. I'm really sorry if I'm making this difficult. I'm trying to put it as plain as I can with all the pertinent info. I realize that in my initial post I got my info wrong. I posted it as a last minute thing before I went to bed so that's my bad.

You got it, John. THat's exactly it.

--- It still doesn't make a lot of sense to me.

Here's your sketch in ASCII. View it with a fixed pitch font like Courier:

You say that, "Anytime one of the switches is closed, the other 2 should open."

So, if 1 is closed, then 2 and 3 will be open and the audio will be routed around SECTION 1 and won't be allowed to get to OUT through

Similarly, if 3 is closed, 1 and 2 will open and the audio will have to go through SECTION 1 and then make its way to the output through

2. Now, if 2 is closed, 1 and 3 will open and the audio input will be connected to OUT through 2 as well as being forced to travel through SECTION 1 and SECTION 2 and eventually connect to OUT as well.

Is that what you really want? I don't think so, unless your friend wants a lot of feedback.

Why don't you just come clean and tell us what he wants to do?

Does he have a couple of [guitar] effects that he wants to engage with foot switches, like hit switch 1 and effect 1 comes out, hit switch 2 and effect 2 comes out and hit switch 3 and both effects (or neither) come through? Inquiring minds want to know!-)

-- John Fields Professional Circuit Designer

You've got the gist of it, Ed. The only additional thing would be switch 1 (effect 1) on resets switch 2 and 3 to their off states. The same goes for switch 2's (effect 2)effect on switch 1 and switch 3.

Here's my version of what I think he wants:

I won't invest any time drawing it, as I'm not sure I understand him.

Ed

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