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rajeshbhanushali123
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Circuit Diagram

10/04/2010 7:44 AM

hey friend can any buddy tell me this circuit diagram is correct or wrong?

if not plz suggest me correct one.

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TonyS
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#1

Re: circuit diagram

10/04/2010 8:16 AM

All I can make out is R1=0.222ohm, R2=120ohm

Where's the rest?

It does help by the way if you say what the circuit is for so the guessing game is taken out.

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JohnDG
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#2

Re: Circuit Diagram

10/04/2010 8:59 AM

If I read it correctly, you have +ve of battery to one end of 0.222Ω resistor, other end of 0.222Ω resistor to -ve of battery (I can't see any other components in this loop).

1. The motor will have no voltage across it, and no current through it.

2. That resistor will get very, very hot. It will be dissipating about 650W.

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Doorman
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#3
In reply to #2

Re: Circuit Diagram

10/04/2010 10:14 AM

"2. That resistor will get very, very hot. It will be dissipating about 650W."

For a while, anyway.

Can you tell us, is this for one of you model airplanes? 12VDC/27A battery?

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JohnDG
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#4

Re: Circuit Diagram

10/04/2010 10:43 AM

1. Omit the 0.222Ω resistor

2. Omit the link from the 120Ω resistor to the -ve of the battery.

All you have then is the battery, 120Ω resistor and motor in series.

Assuming the motor is about 300mW at 4.5V, that means it's drawing about 70mA. The 120Ω resistor should limit the current nicely[1]. It will dissipate about 500mW. Use at least a 1W rated resistor. It will get quite warm.

[1] (12-4.5)V/120Ω = 0.0625A, or 62.5mA.

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34point5
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#5
In reply to #4

Re: Circuit Diagram

10/04/2010 11:15 PM

Curious circuit that.

One would think all you need is 120Ω in series with the motor.

i.e. GA JD

But maybe if this is a 'list of bits' arranged to 'connect somehow' - the .222 is actually µF and 2 along with the diodes are meant to be across the brushes for RF and back EMF?

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rajeshbhanushali123
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#6
In reply to #4

Re: Circuit Diagram

10/05/2010 1:16 AM

i will get current as u said but what about voltage i want it 5-6volt.so i have connected that 0.222ohm resistance in parallel to battery.if i am wrong plz tell me where.

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JohnDG
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#7
In reply to #6

Re: Circuit Diagram

10/05/2010 3:02 AM

If you look after the current, the volts will look after themselves. Forget the 0.222Ω resistor.

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