help with elma rotary switch 2x24 position

[jarthel]

Well I plan to make a stepped attenuator out of it.

My question is, where do I start soldering?

on the front of the switch, there are numbers from 0 to 22. From what I understand, I'll be needing 23 resistors for each pole.

In this diagram from Goldpoint (http://www.goldpt.com/schm_ser.html), there's are some tips on on how to solder it.

My question is, do I start with pin 0 and pin1 as my R1 and so on.

Thank you.

Jayel

 

[Squalish]

So did you buy it from Goldpt, with contact boards and everything?

If there aren't any contact boards, you're going to need to secure the resistors, after you've bent their leads 180 degrees on one side, and solder each lead to adjacent pins. Then you will need to solder the next resistor at the next space between pins. This means two leads to each pin. Start with R1 between the first two numbers and progress to R23 between the last two unvacated spots. Hope that makes sense.

 

[jarthel]

It doesn't make sense. sorry. I already know that there are 2 lead in each pins.

As stated my problem is where to I start soldering R1 to R23. On the front of the switch, there are numbers 0 to 22. I assume there must be a 23 that they didn't etched.

 

[Squalish]

Probably, I don't know. Two things: How many contacts are there when you count them, and is the switch continuous rotation or does it stop?

 

[Tomo]

Hi,

0~22?

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22.

Ok how many numbers are there? There are 23 numbers here.

There are 23 inter-pin spaces where resistors will land. But there are 24 pins. Each pins will have two resistors soldered to except two; max vol and min vol pins.

The marked numbers probably refer to the space between pins (inter-pin space). There are only 23 inter-pin space although there are 24 pins because there is a stop on your rotary switch. (that is GOOD)

1. Process start with placing all the resistors IN SERIES on the rotary switch. (don't solder yet and do ONE deck at a time)

2. Once they are placed, check positions. (I assume you already checked resistor values.) There should be one empy inter-pin space.

3. Solder.

4. Repeat from 1 on the other deck

Note there are rotary switch with NO stops. In this case, make up your mind about there max and min vol will be. Then mark that inter-pin space so that you don't solder there.

Pretty simple I think. I would do it on paper and convince myself. (Keep the paper for posterity if I were you) Soldering takes some time even for the skilled. So be cool when you do.

That's all.

T

 

[jarthel]

Quote:

Originally posted by Tomo 2. Once they are placed, check positions. (I assume you already checked resistor values.) There should be one empy inter-pin space.

I assume you mean the space in between pin 1 and pin 24?

Also pin 1 is ground and pin 24 is input. right?

Thank you

Jaye

 

[jarthel]

Quote:

Originally posted by Tomo In this case, make up your mind about there max and min vol will be. Then mark that inter-pin space so that you don't solder there.

Well just like in a pot,when turning the knob counter-clockwise will, it will come to a stop. I assume this is my minimum value where I won't hear any sound. I also assume this is position is position 1 which is made up of pin 1 and pin2. right?

assuming counting starts from 1 to 24.

 

[Tomo]

Jarthel -

It doesn't matter if you connect pin 1 or pin 24 to ground as long as you are consistent. It is a simple VOLTAGE DIVIDER. But you may do the way you said.

The rest should be pretty self-explanatory. Draw a little diagram and work it out. It shouldn't take too long to figure out.

T

 

[jarthel]

probably a dumb question but

in position 1, I have ground on the 1st pin. So this means that there's no sound as the output is grounded. right?

thank you

jayel

 

[Tomo]

J -

Just try it out. As I said before, "self-explanatory."

T