Relay - most basic coil relay to show operation

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R.William

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Hi, I'm looking for the most basic 4 pin relay that can be powered off a battery 9v at max

this is for a project to show in most basic terms a relay working, so the coil can be seen etc, ideally I would like to power it from AA batteries - this is the most basic project etc

please could someone recommend such a relay - we use to have these at school when I was a kid but I can't find them anywhere.
 
One option, which probably isn't exactly what you're thinking...

A reed relay of the type Radio Shack (still, on-line) sells is a magnetic reed switch surrounded by a coil of wire. The reed switch can actually be removed from the coil without damage to either – I've bought these when I needed a reed switch.

Using a bare reed switch, you can demonstrate how bringing a magnet close will make the switch close. Then explain that the coil creates a magnetic field to do the same thing.



 
How about a 12 V automotive relay? They are cheap. You can probably pick them up for pennies at a car scrap heap. You can take the cover off easily to show the contact moving inside. They will all work from 9 V.
 
Thanks for your Replies a Reed Relay looks interesting its worth thinking about.

Yes those automotive relays are exactly the kind of thing I want
I've seen some 6v ones like this

Relay 6 V 6 V 40 A Closer No Car Working Current Relay Switch Relay 5 Pin : Amazon.co.uk: Automotive

Buy Relay 6 V 6 V 40 A Closer No Car Working Current Relay Switch Relay 5 Pin at Amazon UK. Free delivery on eligible orders.
www.amazon.co.uk
do you think this would operate with 4 AA batteries?
Does it need 40A to operate of it can switch a maximum of 40A?
 
The 40 A is the rating of the contacts, so the maximum current that it can switch.

The coil will take somewhere around 200 mA.
 
ok it might be worth a try and I just saw some 5v coil relays if you or anyone else can recommend any please let me know, Thanks
 
With a sharp razor knife, you should be able to trim the plastic case off of a 5v relay in a few minutes. Buy a few extras in case you clip an internal wire.
 
Are you trying to show the mechanical operation or the electrical operation, or both? Reed and automotive relays have the mechanism hidden. As gophert said, you might be able to cut the case of of a automotive relay. I did see some automotive relays with clear cases, that were SPST (4 pin) contacts:
Automotive relays
If you need to purchase them...where are you in the world?
 
KMoffett said:
I did see some automotive relays with clear
Click to expand...

Right, The old "crystal cube"/"ice cube" relays looked great.

Like theses...

12VDC DPDT 10A "ICE CUBE" RELAY

Y2N. 12VDC, 135 Ohm coil. D.P.D.T. contacts rated 10A. Clear polycarbonate case, 26.5 x 20.5 x 34.5mm high. 0.187" QC/ solder terminals, or can be socket mounted. For sockets see CAT#s ST-2SL, RST-2
www.allelectronics.com
 

you might want to look at general purpose relays from Omron. They are about 1.5 inches tall and you can see the coil and armature operate thru clear plastic cover. The cover can be removed if you want. They come in various operating voltages.


 
Hi, I'm in the Uk
I've ordered a Learning Toy Relay from Ebay don't know if it will be any use, suppose to work at 3v
**broken link removed**

I Guess I could make one solenoid etc but its not really what I want

Yeas the Omron and some of those other IceCube ones look good

I don't know anything about 12v supplys, ill probably have to start another thread about that.

I might have some more questions and replies this is just more a Thnanks! and acknowledgement for the replies.
 
Get a free TV or free microwave on craigslist they have PC board relays inside with COILS. Relays with "COILS." Snap off the plastic case you can see the COIL. I have several with 6 volt COILS that I found in TVs.

**broken link removed**
 
Last edited:
gary350 said:
Get a free TV or free microwave on craigslist they have PC board relays inside with COILS. Relays with "COILS." Snap off the plastic case you can see the COIL. I have several with 6 volt COILS that I found in TVs.

**broken link removed**
Click to expand...

Microwave ovens , yes - plenty of relays.

But not very many TV's used relays - a few very old CRT ones used them for standby - but not many, and not for very long (it's a crude and expensive solution to the issue of standby).
 
KMoffett said:
R. William,
You never relly stated the purpose of the relay. Is this for a class project?
Click to expand...
It is a teaching and learning project at the same time , I remember very basic ones at school that worked from AA batteries but could not find anything similar.
 
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