1.5VDC Relay..

R

Ross Irvine

Guest
Hi All,

I need some 1.5VDC Relays (Trigger/Contact voltage).
I've check DSE, radio parts, jaycar and I'm struggling to find relays
that will trigger at this low voltage. I've found 5 and even 3.5VDC but
I need 1.5VDC.

Any ideas?

Thanks,

Ross.
 
On Fri, 28 Jan 2005 14:07:28 +1100, Ross Irvine
<rirvineDOT@netspaceDOT..DOTnet.DOT.au> wrote:

I need some 1.5VDC Relays (Trigger/Contact voltage).
I've check DSE, radio parts, jaycar and I'm struggling to find relays
that will trigger at this low voltage. I've found 5 and even 3.5VDC but
I need 1.5VDC.
Click to expand...
Don't think I've ever seen of 1V5 mechanical relays.

Tell us the application - in detail - and we may be
able to suggest other options.

Mike Harding
 
"Ross Irvine"
I need some 1.5VDC Relays (Trigger/Contact voltage).
Click to expand...

** Huh ???????

Please explain.

Most relays have coil voltage ratings and DC and AC breaking capacity
ratings.

Then there are all the special types.



............ Phil
 
Hi Mike,

I have a 1.5VDC wireless doorbell (the 'bell' runs on 1.5VDC) that I
want to hook into my Alarm/Home Automation system. The easy solution is
to attach a relay to the wireless 'bell' which loops a NC or NO contact
back to the alarm panel. There are plenty of contacts on the wireless
bell's PCB which energises 1.5VDC (It runs on 2 * 1.5 D size batteries)
when the doorbell "rings" which I can use to close a relay. The relay
closes, the alarm panel 'sees' the zone change then I can act on it.
The problem is finding some type of relay system that'll work with such
low voltages.
As the doorbell itself (not the remote that you push) just runs on it's
own batter power it would be good to be able to utilise its own power
rather than running 12-24VDC to it just to power a relay or some other
device

Thanks,

Ross.



Mike Harding wrote:
Don't think I've ever seen of 1V5 mechanical relays.

Tell us the application - in detail - and we may be
able to suggest other options.

Mike Harding
Click to expand...
 
Ross Irvine wrote:
I need some 1.5VDC Relays
Click to expand...
I think I've seen reed relays that work at this voltage,
if that would work for you (normally-open...)
 
On Fri, 28 Jan 2005 14:45:01 +1100, Clifford Heath <no@spam.please>
wrote:

Ross Irvine wrote:
I need some 1.5VDC Relays

I think I've seen reed relays that work at this voltage,
if that would work for you (normally-open...)
Click to expand...
Can't see any reed relays below 3V5 in Farnell/RS.

Mike Harding
 
On Fri, 28 Jan 2005 14:14:59 +1100, Mike Harding
<mike_harding@nixspam.fastmail.fm> wrote:

On Fri, 28 Jan 2005 14:07:28 +1100, Ross Irvine
rirvineDOT@netspaceDOT..DOTnet.DOT.au> wrote:

I need some 1.5VDC Relays (Trigger/Contact voltage).
I've check DSE, radio parts, jaycar and I'm struggling to find relays
that will trigger at this low voltage. I've found 5 and even 3.5VDC but
I need 1.5VDC.

Don't think I've ever seen of 1V5 mechanical relays.

Tell us the application - in detail - and we may be
able to suggest other options.

Mike Harding
Click to expand...
Hello Mike,
Funny thing, I was just reading a railways signalling manual
the other day called "Track Circuits" and there was a
description of low voltage relays and single wet cells for
powering the circuit and the relay coils. From memory they
pulled in at just over a volt and dropped out just under a volt.
They were huge, about half a house brick in volume.
Regard,
John Crighton
Hornsby
 
On Fri, 28 Jan 2005 04:35:59 GMT, john_c@tpg.com.au (John Crighton)
wrote:
Funny thing, I was just reading a railways signalling manual
the other day called "Track Circuits" and there was a
description of low voltage relays and single wet cells for
powering the circuit and the relay coils. From memory they
pulled in at just over a volt and dropped out just under a volt.
They were huge, about half a house brick in volume.
Click to expand...
They would be too :)

And not only large in size but _very_ large in price too
I suspect. Usually that sort of stuff has to be "fail safe".

Mike Harding
 
Ross Irvine wrote:
Hi Mike,

I have a 1.5VDC wireless doorbell (the 'bell' runs on 1.5VDC) that I
want to hook into my Alarm/Home Automation system. The easy solution is
to attach a relay to the wireless 'bell' which loops a NC or NO contact
back to the alarm panel. There are plenty of contacts on the wireless
bell's PCB which energises 1.5VDC (It runs on 2 * 1.5 D size batteries)
when the doorbell "rings" which I can use to close a relay. The relay
closes, the alarm panel 'sees' the zone change then I can act on it.
The problem is finding some type of relay system that'll work with such
low voltages.
Click to expand...
what about using an optocoupler eg. 4n25?

josh
 
Opto couplers?

David

Ross Irvine wrote:

Hi All,

I need some 1.5VDC Relays (Trigger/Contact voltage).
I've check DSE, radio parts, jaycar and I'm struggling to find relays
that will trigger at this low voltage. I've found 5 and even 3.5VDC but
I need 1.5VDC.

Any ideas?

Thanks,

Ross.
Click to expand...
 
On Fri, 28 Jan 2005 16:48:01 +1100, Josh <josh@.festy.org> wrote:

Ross Irvine wrote:
Hi Mike,

I have a 1.5VDC wireless doorbell (the 'bell' runs on 1.5VDC) that I
want to hook into my Alarm/Home Automation system. The easy solution is
to attach a relay to the wireless 'bell' which loops a NC or NO contact
back to the alarm panel. There are plenty of contacts on the wireless
bell's PCB which energises 1.5VDC (It runs on 2 * 1.5 D size batteries)
when the doorbell "rings" which I can use to close a relay. The relay
closes, the alarm panel 'sees' the zone change then I can act on it.
The problem is finding some type of relay system that'll work with such
low voltages.

what about using an optocoupler eg. 4n25?
Click to expand...
Hmmm... Ross's post didn't show on my news server, too many
of those on Ihug for my liking, anyway...

At 1V5 an opto coupler may not work - but as you only want
one you may be able to select a particular one which will.

Otherwise just use a basic NPN transistor BC337 or similar
with a 1K resistor in the base. If you don't understand this
let me know and I'll do an ASCII drawing.

Oh well, I'll do it anyway: (fixed font)

C/--------> Alarm panel
/
B|/
Doorbell <------- 1K resistor ------- |
|\
\
E\
|
|
0V on both doorbell and alarm


You may need a resistor (1K?) from the BC337 collector to 12V
(or whatever on the alarm panel).


Mike Harding
 
"Ross Irvine" <rirvineDOT@netspaceDOT..DOTnet.DOT.au> wrote in message
news:41F9AC70.5BB81C17@one.com...
Hi All,

I need some 1.5VDC Relays (Trigger/Contact voltage).
I've check DSE, radio parts, jaycar and I'm struggling to find relays
that will trigger at this low voltage. I've found 5 and even 3.5VDC but
I need 1.5VDC.

Any ideas?
Click to expand...
**There are quite a number of possible solutions. None of which involve a
1.5 Volt relay. What is the precise application?


--
Trevor Wilson
www.rageaudio.com.au
 
Hi Trevor,

I have a 1.5VDC wireless doorbell (the 'bell' runs on 1.5VDC) that I
want to hook into my Alarm/Home Automation system. The easy solution is
to attach a relay to the wireless 'bell' which loops a NC or NO contact
back to the alarm panel. There are plenty of contacts on the wireless
bell's PCB which energises 1.5VDC (It runs on 2 * 1.5 D size batteries)
when the doorbell "rings" which I can use to close a relay. The relay
closes, the alarm panel 'sees' the zone change then I can act on it.
The problem is finding some type of relay system that'll work with such
low voltages.
As the doorbell itself (not the remote that you push) just runs on it's
own batter power it would be good to be able to utilise its own power
rather than running 12-24VDC to it just to power a relay or some other
device

Thanks,

Ross.



Trevor Wilson wrote:
"Ross Irvine" <rirvineDOT@netspaceDOT..DOTnet.DOT.au> wrote in message
news:41F9AC70.5BB81C17@one.com...
Hi All,

I need some 1.5VDC Relays (Trigger/Contact voltage).
I've check DSE, radio parts, jaycar and I'm struggling to find relays
that will trigger at this low voltage. I've found 5 and even 3.5VDC but
I need 1.5VDC.

Any ideas?

**There are quite a number of possible solutions. None of which involve a
1.5 Volt relay. What is the precise application?

--
Trevor Wilson
www.rageaudio.com.au
Click to expand...
 
Never used Opto couplers before.

Reading some specs it seems in it's simplest format it can be used as a
relay.

Energise PINS 1 and 2, shorts pins 4 and 5 together.

Is this right?

Thanks,

Ross.

quietguy wrote:
Opto couplers?

David
Click to expand...
 
Ross,

What about a solid state relay, they may operate from a lower voltage, also
maybe a DC/DC converter prior to a relay that normally needs atleast 3 to 5V
is also a solution.

Regards,

John.
"Ross Irvine" <rirvineDOT@netspaceDOT..DOTnet.DOT.au> wrote in message
news:41F9AC70.5BB81C17@one.com...
Hi All,

I need some 1.5VDC Relays (Trigger/Contact voltage).
I've check DSE, radio parts, jaycar and I'm struggling to find relays
that will trigger at this low voltage. I've found 5 and even 3.5VDC but
I need 1.5VDC.

Any ideas?

Thanks,

Ross.
Click to expand...
 
"Ross Irvine" <rirvineDOT@netspaceDOT..DOTnet.DOT.au> wrote in message
news:41FC700A.6385912E@netspaceDOT..DOTnet.DOT.au...
Hi Trevor,

I have a 1.5VDC wireless doorbell (the 'bell' runs on 1.5VDC) that I
want to hook into my Alarm/Home Automation system. The easy solution is
to attach a relay to the wireless 'bell' which loops a NC or NO contact
back to the alarm panel. There are plenty of contacts on the wireless
bell's PCB which energises 1.5VDC (It runs on 2 * 1.5 D size batteries)
when the doorbell "rings" which I can use to close a relay. The relay
closes, the alarm panel 'sees' the zone change then I can act on it.
The problem is finding some type of relay system that'll work with such
low voltages.
As the doorbell itself (not the remote that you push) just runs on it's
own batter power it would be good to be able to utilise its own power
rather than running 12-24VDC to it just to power a relay or some other
device
Click to expand...
**Then I would consider using one of these:

http://tinyurl.com/4aba2

Although it states that it is suitable for 3 Volt operation, I am pretty
certain that it works down to 1.5 Volts. DON'T spend any money, 'till you're
certain though. I built one a few years ago, I think it worked OK on 1.5
Volts. I'll try to find it and let you know.

At present I am mucking about with some solar powered garden lights, which
were on special at Flower Power http://www.flowerpower.com.au/ last
weekend. A pair of lights was marked down to 13 Bucks. They had a couple of
hundred in stock on Sunday. Anyhoo, they operate a white LED from a 1.5 Volt
battery. There's a little PCB inside, which I assume converts the 1.5 Volts
to something a little higher. I'll let you know how I go. I wanted to 'hot'
mine up, using some Lumileds. One of these might be useful for your
purposes.

BTW: Most of the light seems to be lost by the (crappy) diffuser in these
things.


--
Trevor Wilson
www.rageaudio.com.au
 
On Fri, 28 Jan 2005 14:50:41 +1100, Mike Harding
<mike_harding@nixspam.fastmail.fm> wrote:

On Fri, 28 Jan 2005 14:45:01 +1100, Clifford Heath <no@spam.please
wrote:

Ross Irvine wrote:
I need some 1.5VDC Relays

I think I've seen reed relays that work at this voltage,
if that would work for you (normally-open...)

Can't see any reed relays below 3V5 in Farnell/RS.

Mike Harding
Click to expand...

Normally, reed relays for general purpose apps don't come below 3V.
However, special purpose polarised reed relays are manufactured for
high sensitivity functions in the telephony area. I have some single
c/o units on hand manufactured by IEI Japan (STC subsidiary but no
longer in existence) which measure 52L x 15W x 14H which operate down
to 1.0V
 
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