Re: Need switching circuit

On 2 Oct 2005 12:32:03 -0700, "GoatBoy" <goatboy1@xxxxxxxxx> wrote:

>Here's a diagram of the circuit:
>http://www.ronsound.com/ebay/circuit.jpg
>
>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.

---
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:



+-----------+ +-----------+
IN>--+--| SECTION 1 |--+--| SECTION 2 |--+--->OUT
| +-----------+ | +-----------+ |
| ___ | ___ |
+------O O--------+-------O O-------+
| 1 ___ 3 |
+----------------O O----------------+
2

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
2, but will have to go through section 2 on its way to the output.

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
3.

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
.

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