Electronic switch

It depends what voltage and current it will be switching.

If it is switching DC ( at say an amp) then an FET or transistor will do the job.

If switching AC (low/medium current) then a Triac (suitably chosen with logic level switching).

Thanks...but my exact requirement is to change the contacts from NC to NO(make to break) when it gets the 5 VDC volltage.I think transsitor and FET starts conducting (ie from NO to NC)when we provide the bias voltages.Even if i have some pulse type changeover also..it is OK.

I can use a relay, but it occupies more sapce and costs more.

I'm going to use to cut off the existing relay when this circuit gets voltage of 5 V.

Just use a second transistor or FET to invert the 5v signal!

Or use a Transistor/FET of the opposite typ e.g PNP transistor or P type FET.
(This assumes you have some voltage avilable for bias)

Del

I'm more of instrumentation..not having deeper knowlwedge in electronics...could you pls explain me in detail possibly with a circuit diagram for changing a contact from make to break after getting DC voltage.

I think it should work if i put the invertor ouptut acorss the relay coils...let me try and confirm

P channel logic level FET. Chose a suitable one to carry the required voltage and current over here: irf or infineon or other MOSFETs manufactures. If you have very fast switching speeds you may need a FET driver (push pull) to take care of gate charge capacitance.

hope this helps

Try googling this;

AS5W-K 5V from TAKAMISAWA

We use these on most of our products

Dear sir,

good day !

our company can supply many kinds of relays and switch, you can visit our website http://www.anovay.com for detail .

any needs or questions ,please feel free to contact me .

best regards

jessie

jessie@anovay.com

There are a lot of "solid state relays"small dip ,different trademarks..Gordos Corp.,I.R.,Potter and Brumfield...Go to a good industrial electronics devices distributor.-

Do you need optical isolation?

try http://www.opto22.com/

They have AC and DC Outputs and Inputs.

I am a bit confused with your question...Is this a simple change over, latching or flip-flop?... Why don't you add a circuit so we can help...

Do you want the contact to stay close (or open) only as long as the +5V is present? or do you want the relay to latch?, meaning the +5V is only a short duration pulse just long enough to energize the relay. Second question is what are you switching? rate the Current and voltage.

Wangito

hi,

Actualy I'm switching a load rated 4A through a relay...I'm laready latching this relay through his own contact.Once the realy has got latched ,load gets power continously.In order to switch off the load i need to delatch this contact . whts my earlier plan was to put a NC contact of another relay inseries with the former one.This will work for sure..But it occupies more space n cost..thats y I'm looking for an electronic component which can deenergise this after getting a pulse/ continous command.

How do you release the the relay now? manually or electrically.

As I said, it would be nice to have the present circuit.

Wangito.

I'm going to use a inverter circuit across the relay...So that when I get 5 VDC it will momentarily deenergise the relay opening the latched contact...But this is not yet checked..hope it will work...

What about a 14053 triple multiplexer de-multiplexer: works just like a changeover relay:-

http://docs-europe.electrocomponents.com/webdocs/05fb/0900766b805fb5ba.pdf

You probably need to check the ON Resistance (quite high for the CD/MC14053 lower for the HC14053).

For more information on analogue switches see this:-

http://www.maxim-ic.com/appnotes.cfm/an_pk/638

If you need a metallic contact then driving the relay coil the other way round may work:-

Can't post pictures at the moment so here's an attempt at a text picture:-

...In>-----╔═════╗............+5V-----╔═════╗
..............║.§...........║........................║.§...........║
..............║.§........|..║.......................║.§........|..║
..............║.§........\..║.......................║.§........\..║
..............║.§.........\.║.......................║.§.........\.║
..............║.§........|..║.......................║.§........|..║
..............║.§........|..║.......................║.§........|..║
..............║.§...........║.......................║.§...........║
....0V-----╚═════╝............In>-----╚═════╝
...................

Aaaaagh! don't know where that ═ keeps coming from, but I think you get the idea.