Maker Pro
Maker Pro

Best type of relay to switch low-voltage signals?

J

Jim

Jan 1, 1970
0
Hi all,

I need some relays to switch a S/PDIF digital audio signal (500mV-1V pk-pk)
that could run at up 12Mbits/sec. I want to drive the relays with 5V DC.

I understand that some relays suffer after time with such low signal
voltages (corrosion on the contacts?), and since I am hoping to sell a few
of these units to other enthusiasts, I want to choose ones that will still
work after years of use.

[In case this is relevant: The relays are to to allow a "pass-thru" mode
when the circuit is not required. The relays will only switch when the unit
is turned from standby<->on, so I don't anticipate much switching to be done
per day. However, the unit might be left on for long periods of time or all
the time maybe.]

Can anyone please recommend a type or relay that would be suitable and maybe
a manufacturer/supplier? I am looking for either a couple of DPDT or a
4PDT - sub $2 per pole would be nice too ;)

Many thanks,

Jim
 
J

Jim Weir

Jan 1, 1970
0
I have used the Omron G5 series now for twenty years in a low-level audio
switching application in a high-vibration dirty environment. Something like 20K
of them in the field and as yet, not a single failure.

They are well sealed and have a gold flash over silver alloy contact that should
work well for you.

No connection to Omron, just a happy customer.

Just 'cause I'm nosy, why not switch with the cmos 4066 series of analog switch?

Jim




"Jim" <[email protected]>
shared these priceless pearls of wisdom:

->Hi all,
->
->I need some relays to switch a S/PDIF digital audio signal (500mV-1V pk-pk)
->that could run at up 12Mbits/sec. I want to drive the relays with 5V DC.
 
B

Baphomet

Jan 1, 1970
0
Jim said:
Hi all,

I need some relays to switch a S/PDIF digital audio signal (500mV-1V pk-pk)
that could run at up 12Mbits/sec. I want to drive the relays with 5V DC.

I understand that some relays suffer after time with such low signal
voltages (corrosion on the contacts?), and since I am hoping to sell a few
of these units to other enthusiasts, I want to choose ones that will still
work after years of use.

[In case this is relevant: The relays are to to allow a "pass-thru" mode
when the circuit is not required. The relays will only switch when the unit
is turned from standby<->on, so I don't anticipate much switching to be done
per day. However, the unit might be left on for long periods of time or all
the time maybe.]

Can anyone please recommend a type or relay that would be suitable and maybe
a manufacturer/supplier? I am looking for either a couple of DPDT or a
4PDT - sub $2 per pole would be nice too ;)

Many thanks,

Jim

http://relays.tycoelectronics.com/lexicon/Characteristicfeatures.stm
 
J

Jim Nagy

Jan 1, 1970
0
You may want to give some thought to a CMOS gate as a switch - check
out the 4016 and 4066 ICs.
 
T

Tony Williams

Jan 1, 1970
0
I have used the Omron G5 series now for twenty years in a
low-level audio switching application in a high-vibration dirty
environment. Something like 20K of them in the field and as yet,
not a single failure.

Agreed. I've used the Omron G5 and (for 4PCO) the
G6A-434P, in quantity. Both are reliable for low-level
switching.
 
J

Jim

Jan 1, 1970
0
Jim Weir said:
I have used the Omron G5 series now for twenty years in a low-level audio
switching application in a high-vibration dirty environment. Something like 20K
of them in the field and as yet, not a single failure.

They are well sealed and have a gold flash over silver alloy contact that should
work well for you.

No connection to Omron, just a happy customer.

Just 'cause I'm nosy, why not switch with the cmos 4066 series of analog switch?

Jim
<snip>

Hi Jim,

Many thanks for your recommendation - I was looking at the G5s, TBH mainly
because they are amongst the lowest priced and easy to get hold of (Farnell
in the UK), so it's very good to hear they perform well too.

Re the cmos 4066 - I wil have to look into that. I want to provide as
transparent a transport of the signal as possible, so have been thinking
along the lines of physical relays so far. I will look into the cmos analog
switches though.

Jim
 
J

Jim

Jan 1, 1970
0
Jim said:
Hi all,

I need some relays to switch a S/PDIF digital audio signal (500mV-1V pk-pk)
that could run at up 12Mbits/sec. I want to drive the relays with 5V DC.
<snip>

Many thanks for the replies and recommendations. I'm also going to look into
the possibility using cmos analogue switches as suggested.

Jim
 
Top