Author Topic: Transistor + relay...Does it exist?  (Read 4514 times)

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Offline Hawaii00000Topic starter

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Transistor + relay...Does it exist?
« on: June 16, 2009, 10:47:56 PM »
Hey guys and gals,
Does anyone know if there's a relay I can buy that has  a transistor built into it? I need to build a h-bridge and the less pieces I have to mess with, the better.
« Last Edit: June 17, 2009, 08:28:06 PM by Hawaii00000 »
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Offline SmAsH

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Re: Transistor + relay...Does it exist?
« Reply #1 on: June 17, 2009, 12:38:03 AM »
why not just DIY it?
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Offline Asellith

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Re: Transistor + relay...Does it exist?
« Reply #2 on: June 17, 2009, 06:30:15 AM »
use a solid state relay. Thats kinda what they are. If you get the right one it could run off lot level logic. Need to shop around.
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Offline Hawaii00000Topic starter

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Re: Transistor + relay...Does it exist?
« Reply #3 on: June 17, 2009, 05:54:21 PM »
I did bit of research after this post and I found some h-bridge ICs. Would that work with a 12 volt battery? If not the solid state relay should work.
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Offline Soeren

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Re: Transistor + relay...Does it exist?
« Reply #4 on: June 17, 2009, 06:30:47 PM »
Hi,

Hard to say when when you keep the type number a secret ;D
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Offline Hawaii00000Topic starter

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Re: Transistor + relay...Does it exist?
« Reply #5 on: June 17, 2009, 08:10:35 PM »
Do you mean the type number for the IC? Someone suggested a ISL2110 or ISL2111 from Intersil ( http://answers.yahoo.com/question/index?qid=20090416074917AASbNVx )... would that work?


I'm not exactly  sure of the motors and battery but I will be using two motors rated for 12v.

« Last Edit: June 17, 2009, 08:27:28 PM by Hawaii00000 »
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Offline HDL_CinC_Dragon

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Re: Transistor + relay...Does it exist?
« Reply #6 on: June 17, 2009, 09:56:14 PM »
We need to know the current too. How much current does your motor draw under load?
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Offline Hawaii00000Topic starter

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Re: Transistor + relay...Does it exist?
« Reply #7 on: June 17, 2009, 10:20:45 PM »
Honestly, I'm not completely sure. One motor I am looking at says "Horse Power Cont.— 60mA" (with no load) so I guess that means it draws 60mA.
Is that right?
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Offline SmAsH

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Re: Transistor + relay...Does it exist?
« Reply #8 on: June 18, 2009, 06:34:44 AM »
"no load" means its spinning freely. look for something that says "stall current" and that is the MAX current your motor will draw.
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Offline Hawaii00000Topic starter

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Re: Transistor + relay...Does it exist?
« Reply #9 on: June 18, 2009, 04:42:42 PM »
I can't find any other current rating besides that one, and I think I might have to put this post on hold for a day or two, because I'm getting kinda confused with motor specs. I thought I found a good motor for the job, but now I'm not so sure.  ???
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Offline lemontree

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Re: Transistor + relay...Does it exist?
« Reply #10 on: June 19, 2009, 12:48:13 AM »
If you must use a relay then maybe look up some information on reed relays. I still think they are kinda cute:
http://en.wikipedia.org/wiki/Reed_relay
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Offline Hawaii00000Topic starter

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Re: Transistor + relay...Does it exist?
« Reply #11 on: June 23, 2009, 01:57:34 AM »
Ok so the I think I'm gonna use a motor that runs on 9v and has a stall torque of 17A.
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Offline Trumpkin

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Re: Transistor + relay...Does it exist?
« Reply #12 on: June 23, 2009, 07:14:32 AM »
Quote
If you must use a relay then maybe look up some information on reed relays. I still think they are kinda cute:
http://en.wikipedia.org/wiki/Reed_relay
A bit more complicated (and more pieces) then a normal relay, eh?
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