9pdt switch implementation

[just0m3]

I want to build a 9pdt switch. So far i have implemented one using 3x hcf4053 3pdts. Despite the fact that it is working, it is too large for a pcb concerning the use of resistors and capacitors for proper biases. Another option i guess is using relays but size is again a problem. Could someone suggest another solution? (9 connections are necessary).
Thanks in advance .

[davent]

You might find a 12PDT rotary switch and just use the nine you need.
dave

[just0m3]

Thank you for your answer. Do you have a price range of such a switch ? The previous implementation costs about 2 euro.

[anotherjim]

It would probably be a wafer switch solution for that many poles.
https://en.wikipedia.org/wiki/Rotary_switch
I haven't had any for a long time, so can't think of a suitable supply.
You usually have to buy the switch "chassis" and the required wafers or decks as separate orders as the more complex arrangements are not available ready assembled.
You can probably get what you want with 2x 6pole-2way decks.
Price might be a problem, they can be expensive and you have assembly work to do + wiring. It would be hard to beat your solid state solution.
Won't surface mount parts make the CMOS switches small enough?

[davent]

Thank you for your answer. Do you have a price range of such a switch ? The previous implementation costs about 2 euro.

It would cost much more then 2 euros. I did come across a 12pdt toggle switch but it was $850 at Neutrik.

dave

[just0m3]

Forbidden for my pocket . I guess i ll stick to my plans then.

[slacker]

It might be helpful to give us more idea what you are trying to do, I'd be very surprised if there wasn't another way to do it without using a crazy switch.

[Processaurus]

You don't have to bias everything, if you use a negative power supply for the Vee pin on each 4053. You can use a charge pump, like the LT1054, to make the -9v supply, pretty easily.

[Processaurus]

Or, you can use the switch out of an old monitor switcher. They're 15PDT switches, I believe.

[EBK]

It might be helpful to give us more idea what you are trying to do, I'd be very surprised if there wasn't another way to do it without using a crazy switch.

+1

When the switching gets too complicated, it may be time to redesign the things being switched.

[just0m3]

I am trying to swap an expression pedal between two pots on the same circuit. I have given it much time and i believe 9 connections are at some point mandatory

[Quackzed]

dont know if this helps but i did a pretty tight (if you ask me) 4053 layout for another project , sequencer bypass thing, but with the bias resistors all on end with a few floating wire traces it can be pretty small,and its pretty sturdy despite the floating thing, yellow r's and c's are the vref r's and cap... your wiring will be a bit different , but you can see the layout compacting idea, maybee 3 could fit this way?

[just0m3]

Your implementation seems legit. I have done one myself using 3 x 4053 and for one project i didn't use any resistors or capacitors because voltages were biased. The thing is that in this situation i am low on choices.

[Ben Lyman]

the first thing that came to mind when I read the title was:
Three 3PDT stomp switches side by side in a Boss type of pedal under the foot pad lever gadget.

[just0m3]

the first thing that came to mind when I read the title was:
Three 3PDT stomp switches side by side in a Boss type of pedal under the foot pad lever gadget.

What magical thing is this ?

[antonis]

the first thing that came to mind when I read the title was:
Three 3PDT stomp switches side by side in a Boss type of pedal under the foot pad lever gadget.

What magical thing is this ?

Don't bother if you aren't a big foot magician... 

[reddesert]

I am trying to swap an expression pedal between two pots on the same circuit. I have given it much time and i believe 9 connections are at some point mandatory

I think a 6pdt would work for that. I'm assuming you have Pot A, Pot B, and the expression pedal, each has three contacts, and you want the pedal to replace either Pot A or Pot B.

[RickL]

Do you really need to switch all three contacts on each of the pots?  If any of the contacts on the  two pots connect to the same place (e.g. ground) I think you could switch only two of the contacts, which means you only need a 4pdt switch. These are readily available, in fact I think Steve sells a stomp version.

[just0m3]

The thing is that a stereo expression jack has 6 connections. 3 are permanent connected and 3 are temporal. You can't just connect the 3 ones. Just make a schematic on your own and you can see the results. In my case there aren't grounded connections or something common for me to reduce the number of connections.

[davent]

Show us the schematic.

dave