Joined: 05 Dec 2005
Posts: 497
Location: Mt Druitt,Sydney,NSW
Electrical help
Okay people I have another question
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? _________________ A journey of a million miles begins with a single step followed by a hell of a lot of other steps so get walking
Tue Nov 20, 2007 5:21 pm
Fish_in_a_Barrel
Joined: 30 Sep 2006
Posts: 673
Location: Perth, Western Australia
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. _________________ They say that he crossed the fine line, from insanity to genius.
Tue Nov 20, 2007 5:35 pm
cerberus3112
Joined: 05 Dec 2005
Posts: 497
Location: Mt Druitt,Sydney,NSW
Joined: 18 Jun 2004
Posts: 3842
Location: Queensland near Brisbane
A double throw relay perhaps. _________________ So even the rain that falls isn't actually going to fill our dams and our river systems
Tue Nov 20, 2007 7:05 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
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.
Joined: 05 Dec 2005
Posts: 497
Location: Mt Druitt,Sydney,NSW
the switch is automaticly closed when It needs to turn on
and DPDT's would count as physical methods _________________ A journey of a million miles begins with a single step followed by a hell of a lot of other steps so get walking
Tue Nov 20, 2007 7:41 pm
Fish_in_a_Barrel
Joined: 30 Sep 2006
Posts: 673
Location: Perth, Western Australia
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. _________________ They say that he crossed the fine line, from insanity to genius.
Tue Nov 20, 2007 7:52 pm
cerberus3112
Joined: 05 Dec 2005
Posts: 497
Location: Mt Druitt,Sydney,NSW
I understand what you mean but can I still get that diagram to make sure im on the same page _________________ A journey of a million miles begins with a single step followed by a hell of a lot of other steps so get walking
Tue Nov 20, 2007 8:10 pm
Fish_in_a_Barrel
Joined: 30 Sep 2006
Posts: 673
Location: Perth, Western Australia
Here's my page, it shows you what a year as a drafter has achieved
Do you care to explain why you have a speaker in the circuit running of dc current? _________________ They say that he crossed the fine line, from insanity to genius.
Tue Nov 20, 2007 8:40 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
Joined: 05 Dec 2005
Posts: 497
Location: Mt Druitt,Sydney,NSW
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 _________________ A journey of a million miles begins with a single step followed by a hell of a lot of other steps so get walking
Last edited by cerberus3112 on Tue Nov 20, 2007 8:56 pm; edited 1 time in total
Tue Nov 20, 2007 8:53 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
Joined: 05 Dec 2005
Posts: 497
Location: Mt Druitt,Sydney,NSW
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?? _________________ A journey of a million miles begins with a single step followed by a hell of a lot of other steps so get walking
Tue Nov 20, 2007 9:05 pm
Fish_in_a_Barrel
Joined: 30 Sep 2006
Posts: 673
Location: Perth, Western Australia
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. _________________ They say that he crossed the fine line, from insanity to genius.
Tue Nov 20, 2007 9:09 pm
cerberus3112
Joined: 05 Dec 2005
Posts: 497
Location: Mt Druitt,Sydney,NSW
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. _________________ A journey of a million miles begins with a single step followed by a hell of a lot of other steps so get walking
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