Switching series to pararell

[RAPo]

I have a set of 5 resistors in series in a circuit with a 10v power supply. I want to have them pararell by flipping a switch (and off course also the other way around).
The transition should be as clean as possible, preferably first disconnecting the power. What is the way to do this?

[james_s]

You want all 5 in series to switch to all 5 in parallel? You could do it fairly easily with relays.

Is there a reason you can't just have two separate groups of resistors or even just two resistors, one equivalent to the 5 you have in series and another equivalent to the 5 in parallel? If that would work then it would be easier to do.

[Picuino]

Why do you need them to be the same 5 resistors? Couldn't you put another 5 resistors in parallel and switch between them?

[Picuino]

Maybe this circuit can help you.

https://www.analog.com/en/products/adg1219.html

More circuits like that.

https://www.analog.com/en/parametricsearch/10624#/

[RAPo]

Maybe this circuit can help you.

https://www.analog.com/en/products/adg1219.html

More circuits like that.

https://www.analog.com/en/parametricsearch/10624#/

Many thanks, will look into it.

[Zero999]

What values are the resistors? Analogue switches are only any good for low currents. Relays are required for high currents.

[RAPo]

You want all 5 in series to switch to all 5 in parallel? You could do it fairly easily with relays.

Is there a reason you can't just have two separate groups of resistors or even just two resistors, one equivalent to the 5 you have in series and another equivalent to the 5 in parallel? If that would work then it would be easier to do.

Yes there is a reason: the whole contraption will work either as a set of reference resistors (where you can choose to set your measuring tips) or with the 10V power (precision) supply the same set of resistors can generate a precision current, all in a handy little box.

Version 2  of the contraption will  expand on that with a set of capacitors and inductors that can be connected either in series/independent/parallel (as displayed in ).

[RAPo]

What values are the resistors? Analogue switches are only any good for low currents. Relays are required for high currents.

The resistors are precision SMD resistors ranging from 100 ohms to 10M ohm

[themadhippy]

Analogue switches are only any good for low currents

guess 630A is low current for a 4 pole double throw switch

[james_s]

Analogue switches are only any good for low currents

guess 630A is low current for a 4 pole double throw switch

What does that have to do with analog switch ICs?

[Picuino]

I think making 5 series resistors into 5 parallel resistors is a bit complex and expensive. It is cheaper to duplicate resistors, unless they are of extremely high quality.

An interesting projects:
https://hackaday.com/2020/05/25/a-diy-electronics-lab-you-can-show-off-with-pride/
http://conradhoffman.com/mini_metro_lab.html

[themadhippy]

What does that have to do with analog switch ICs?

not a lot,however the quote i quoted made no mention of ic,in case you missed it

Analogue switches are only any good for low currents. Relays are required for high currents.

[james_s]

not a lot,however the quote i quoted made no mention of ic,in case you missed it

An "analog switch" is an IC, I've never heard a mechanical switch referred to as an analog switch. Context matters, and from the context it is obvious what he was referring to.

[donlisms]

This seems like all you'd need is a 4 pole single throw switch.  If you draw the resistors in a zig-zag, you have two gaps to close on each side to make them all parallel.  This does not address your "preferably turning off first" issue, but I think that's asking a lot.  Maybe you need a 5 pole switch. 

[RAPo]

This seems like all you'd need is a 4 pole single throw switch.  If you draw the resistors in a zig-zag, you have two gaps to close on each side to make them all parallel.  This does not address your "preferably turning off first" issue, but I think that's asking a lot.  Maybe you need a 5 pole switch.

Thanks.
Indeed I was tinkering/experimenting with a 4 pole switch, and the "turning off" aspect is troubling me.