Reed Relays Vs Standard Relays - diyAudio
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Old 15th October 2007, 08:21 PM   #1
steevo is offline steevo  United Kingdom
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Default Reed Relays Vs Standard Relays

I am considering using Reed Relays as opposed to Standard minature relays in my new preamp for swtiching the various input in my preamp.
Reed relays have a much higher insulation reistance of about 10,000 mega ohms compared with about 100 mega ohms for standard relays. This should improve crosstalk at audio frequencies vastly i hope. In doug self preamp design from his book he uses 4 pole switches effectively doubling the air gap between the switch contact to get a channel corrtalk at 10khz of 95db compare with 74db for 2 pole. A huge imrpvoement. So i thoughtthat using reed relays that are hermetically sealed and have huge insulation resistance will thus have lower stray capacitance between contacts. Has anyone ever used reed relays for low level line swtiching. I am cocerned about the magnetic field however. dont how this will affect a low level ac signal.
Any advice anyone??

Thanks
steevo
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Old 17th October 2007, 05:03 AM   #2
nonoise is offline nonoise  South Africa
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No a bad idea good reed relay's will work very well if you are concerned about channel separation you could consider RF type relay's they have very low parasitic capacitance and good isolation.
Teledyne is on example of such relays also look at Coto.
Steineker also makes some very good reed relay's.
The well made reed relays have a small screen around the coil to prevent noise coupling onto the contacts.
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Old 17th October 2007, 06:18 AM   #3
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DC resistance is not the single important parameter, what about capacitive coupling and maybe also inductive coupling?
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Old 17th October 2007, 06:22 AM   #4
suvatn is offline suvatn  Thailand
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For your reference,

http://www.cotorelay.com/html/reed_relays.html
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Old 17th October 2007, 04:40 PM   #5
d3imlay is offline d3imlay  United States
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One of the primary applications for reeds is signal processing. I think board layout would be much more importnat than crosstalk from the reed.
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Old 18th October 2007, 10:50 AM   #6
Mooly is offline Mooly  United Kingdom
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Hi steevo,
I used reed relays in one of my own designs several years back & they were fine, however I much prefer an all electronic solution which is immune to ageing of contacts etc. My latest design uses MOS-FETS in a series shunt arrangement feeding into a virtual earth opamp. Signal isolation is truly impresive with no audible breakthrough even at full volume when fed with 10 volt pk/pk squarewave. Sorry about the hand drawn partial circuit, did'nt have P.C. at the time.
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Old 18th October 2007, 10:10 PM   #7
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Reed relays are not considered as good as sealed gold on gold minature relays.
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Old 20th September 2009, 07:40 PM   #8
Tolu is offline Tolu  Germany
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Sorry fpr holy thread revival!

I am also interested in the question what relays are best for input switching.

I just tried a reed relay and the (negative) sonic impact was very audible. I wanna try out Takamisawa RY and some no-names for comparison. Best switching so far were Silonex opto-couplers!
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Old 20th September 2009, 10:30 PM   #9
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Quote:
Originally Posted by john curl View Post
Reed relays are not considered as good as sealed gold on gold minature relays.
AXICOM V23105A5475A201 are telekom grade - costs a bit but consider thousands of them in the signal path between two ends of the world and both data at several MByte/s and voice is switched perfectly. Maybe too expensive for an audio project, but worth the while.
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Old 21st September 2009, 05:08 AM   #10
suvatn is offline suvatn  Thailand
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For your consideration, reed relay mostly will have two type of contact,
wet and dry.
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