Discussion in 'The Projects Forum' started by serdar, Mar 12, 2013.

1. serdar Thread Starter New Member

Mar 12, 2013
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0
Dear Friends,

I did not make following connections on breadboard I am new..
by passing resistor of 2 end confused my mind?
Regards

2. DickCappels Moderator

Aug 21, 2008
2,746
665
The regulator maintains a constant current by maintaining a constant 5 volts across R2. If you put capacitance in parallel with R2, the circuit's will not be able to adjust the current quickly when the circuit voltage and load change.

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3. serdar Thread Starter New Member

Mar 12, 2013
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because of connection from 2 to the end of resistor confused me too much?

4. JohnInTX Moderator

Jun 26, 2012
2,392
1,051
Figure 4 here shows your hookup for a constant current source as DickCappels indicated. The formula for calculating the constant current is also given.

R1 at the input is needed only if the battery voltage causes the voltage ACROSS the regulator to exceed max.

Note that your schematic is for a constant current source. If you want a constant VOLTAGE, connect it like Fig. 1. In this case, a resistor at the input is sometimes used to dissipate some power before the regulator. Its a poor way to do it.

As far as the connecting on a breadboard, the datasheet shows the pins IN, GND, OUT.

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5. serdar Thread Starter New Member

Mar 12, 2013
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Thank you very much.
but ı need some info about how to connect this circuit on breadboard?

6. #12 Expert

Nov 30, 2010
16,657
7,303
Plug the parts into the holes in the breadboard and connect them to each other with pieces of wire.

7. edwardholmes91 Member

Feb 25, 2013
200
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I think the OP is asking how to use breadboard. Depending on your type of breadboard will depend on how it is connected up... but most breadboards will have either one or two power rails running horizontally along the top and the bottom. Then they will have vertical rails running top to bottom, split in the middle to allow the mounting of ICs and the likes. This website should help you understand how the breadboard works and how you can connect your circuit up: http://www.kpsec.freeuk.com/breadb.htm

Feb 12, 2013
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Mar 12, 2013
9
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10. patricktoday Member

Feb 12, 2013
157
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What??? OK, sure, but you'll have to repost the request in the "fishing" section (if you can find it)

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