How-To/Which passive switch with lowest possible control power

Huh ???? Do you mean that it must only draw power from the control signal?

Take a look at power MOSFETs. For DC on the gate, they draw nearly no power.

A latching relay doesnt require power at all, just a small amount of energy to change its state.

just depends how frequenctly you switch it as to wether this is low enough power.

or maybe this wasnt what you meant when it must not required to be powered. a mosfet switch requires power to control it, albeit minuscule.

Colin =^.^=

Thanks for the answers

a latching relay could be a solution (teoretically the ideal one) if there is one that can change state with very little power (ideally much less than 1 mW).

About the solution with the MOSFET, what are the ones with the lowest DC on the gate (vendor/model) ?

Thanks for any additional tip

a latching relay isnt specified by power, but by energy, many battery powered devices use them, you would need to store up sufficient charge in a moderate size capacitor. you can get 3v mosfet switches.

not sure of models, digikey probably list both these devices.

Colin =^.^=

Hi Colin

thanks for the answer. I looked a little around for the MOSFET solution, and I found that the most "sensible" ones requires on the gate-source still 3 volts and consume 2 ampere (???) DC to saturate. This makes still 6 watt control power to switch my passive switch. Isn't there a more "sensible" way to reach my scope without using an active circuit ? Sorry for my "beginner" questions, but my understanding of electronic is quite basic.

Thanks

they dont require 2A to control, that probably refers to the maximum current it can switch. typicaly gate resistance will be megaohms, so current will be microamps or less.

Colin =^.^=

TN0604 or TN2501 would need very little energy to switch.