Switch AC Signal - Low Impedance (<1ohm) 50Vrms 1-100Khz

[EE4life]

Hi all,

I would like to make a switch for an AC signal (on off ,ie, high impedance and low impedance). The switch should have less than 1 ohmn impedance. The signal can range from 1-100Khz and the signal will be 50Vrms.

I tried to use mosfets, but they do not block the signal completely, and I do not think they are meant to control AC signals like this.

Thanks in advance.

 

[dlgoff]

If you could live with with ~10 volts instead of 50 volts, I would recommend the CD4066BC Quad Bilateral Switch.

 

[berkeman]

Hi all,

I would like to make a switch for an AC signal (on off ,ie, high impedance and low impedance). The switch should have less than 1 ohmn impedance. The signal can range from 1-100Khz and the signal will be 50Vrms.

I tried to use mosfets, but they do not block the signal completely, and I do not think they are meant to control AC signals like this.

Thanks in advance.

You have probably considered simple relays -- could you say why you rejected them? Switching time, bounce, etc?

 

[Baluncore]

There are many ways of doing it, but it will depend on the maximum signal current.
Are the signals in a coaxial cable or a twisted pair?

Often a “T” structure switch is used. Two series switches in the top of the “T” are used to block the signal while another switch in the stem of the “T” grounds the midpoint when the switch is off to greatly reduce feedthrough. Perhaps you can use that structure with mosfets.

 

[alphy]

I would recommend exploring the use of a solid-state relay for this application. Solid-state relays are specifically designed to switch AC signals with low impedance and can easily handle the range of frequencies and voltage levels mentioned in the post. They also have the added benefit of being more reliable and durable compared to mechanical switches. Additionally, I would suggest consulting with an electrical engineer for further guidance and assistance in selecting the right solid-state relay for your specific needs.