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cerberus3112



Joined: 05 Dec 2005
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Location: Mt Druitt,Sydney,NSW


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Electrical help

Okay people I have another question Very Happy

I would like to know the answer to this problem I am having with a circuit im trying to build at home.

Circuit 1:
9V battery goes to the switch then opening (to insert component/s needed) then to the speaker
Circuit 2:
Opening (to insert component/s needed) then to 12V or 24V battery then to motor

Okay the I need it to do these 3 things
1. When circuit 1 is closed I need it to close circuit 2
2. When circuit 1 is opened circuit 2 opens.
3. The components of circuit 1 can not run on 12/24 volt while the ones on cicuit 2 have to run on 12/24 volt
With these 2 resraints
1. This cannot be achieved by physical methods such as putting a switch for each and putting the switches together it has to achieved electricly.
2. Circuit 2 can not have a switch on it

my freind suggested a pic chip and programm it to do what I need
would that work
OR
what other methods could answer this question?
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Post Tue Nov 20, 2007 5:21 pm 
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Fish_in_a_Barrel



Joined: 30 Sep 2006
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Location: Perth, Western Australia


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If you put a 6V relay coil on the 9V circuit, and then use the contacts to close a circuit for a 12V relay to power the motor off the 12/24V battery.

Although I'm a bit fuzzy as to what your trying to do. Confused
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Post Tue Nov 20, 2007 5:35 pm 
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cerberus3112



Joined: 05 Dec 2005
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Location: Mt Druitt,Sydney,NSW


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grr forgot my diagram Laughing
here it is

DIAGRAM
http://www.robowars.org/forum/album_pic.php?pic_id=1442
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Post Tue Nov 20, 2007 6:51 pm 
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Philip
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A double throw relay perhaps.
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Post Tue Nov 20, 2007 7:05 pm 
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Glen
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quote:
1. This cannot be achieved by physical methods such as putting a switch for each and putting the switches together it has to achieved electricly.


what triggers that in turn? a radio control setup? automatic procedure etc

but as phil said a DPDT (which is just two single relays in the one package) relay is what you want. then just power the coils of it whatever way you need to.

but if it was me id just use the one switch and tap off the 12v battery to make 9v for the speaker Razz
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Post Tue Nov 20, 2007 7:11 pm 
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cerberus3112



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the switch is automaticly closed when It needs to turn on

and DPDT's would count as physical methods
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Post Tue Nov 20, 2007 7:41 pm 
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Fish_in_a_Barrel



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So what sort of motor have you got there?

You can do it with transistors easily enough, have a common ground between the 9V and the 12V, then use the 9V through the switch into a current limiting resistor, and then into the bases of the transistors. Make sure that the transistors are the closest component to the ground.

If you use diodes in series with the batteries you could even get away with only 1 transistor, but only if you do it correctly.

Give us a yell if you want a diagram.
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Post Tue Nov 20, 2007 7:52 pm 
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cerberus3112



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I understand what you mean but can I still get that diagram to make sure im on the same page
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Post Tue Nov 20, 2007 8:10 pm 
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Fish_in_a_Barrel



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Here's my page, it shows you what a year as a drafter has achieved Razz

http://www.robowars.org/forum/album_pic.php?pic_id=1443

Do you care to explain why you have a speaker in the circuit running of dc current?
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Post Tue Nov 20, 2007 8:40 pm 
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Glen
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you draw resistors in the old school fashion thats a tafe failure XD!
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Post Tue Nov 20, 2007 8:42 pm 
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cerberus3112



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and to check R1 and R2 need to be resistors that reduce the 12 volts to 9 right?
And whats wrong with the resistor smybol thats the way I draw them

Also mike its hard to explain ill put up pics when im done and its finished
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Last edited by cerberus3112 on Tue Nov 20, 2007 8:56 pm; edited 1 time in total

Post Tue Nov 20, 2007 8:53 pm 
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Glen
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should be the resistors that limit the current needed to turn on the transistors. 4k7 for example
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Post Tue Nov 20, 2007 8:55 pm 
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cerberus3112



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now i need a multimeter to measure what current the 12 battery has berfore i can get nay resistors
also is there different kinds of transistors besides pnp,npn and power transistors??
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Post Tue Nov 20, 2007 9:05 pm 
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Fish_in_a_Barrel



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The size of the resistors depends on the transistor that your using, which depends on the amount of current going through them.

The resister symbol that I used there is the American standard, which we don't use, we use the European standard, which is just a rectangle. I did it that way for your benefit. I usually chop and change depending on the who I do the drawing for.

If your using pn100's which is the replacement for the bc548's (I think) then I use somewhere around a 500 ohm resistor for 5v, so that would be about 1k for 9v.
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Post Tue Nov 20, 2007 9:09 pm 
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cerberus3112



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Location: Mt Druitt,Sydney,NSW


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okay then I was tought that we use the /\/\/\/ for resistors but thanks for telling me that

okay now I need to get those parts and a multimeter and put them together and see what happens. Laughing
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Post Tue Nov 20, 2007 9:36 pm 
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