How would I build this on a breadboard?

A_Guy_Who_

R1 = 1K Ohm Resistor
L1 / L2 = Leds
D4-7=1N4001
Probe = Wire

If someone could actually save the breadboard picture to their desktop and draw the parts on it for me would be great.

How would I build this:


On a breadboard like this:

stamptrol

So, what have you tried already?

Start by calling the red bus Probe 1, Blue bus Probe 2. Top red is probably separate from bottom red. Same with top/bottom blue.

In each column 1 thru 30, a,b,c,d,e are tied together with each other; f,g,h,i.j are tied together with each other. Each column is separated from the other columns.

It is called a Experimenting Breadboard, after all. So experiment!

Beau Schwabe

Is this a school assignment? ...I'm thinking this circuit could be simplified down to two LED's and a resistor.
Forget the diodes D4 through D7, the LED's already do that for you.

You said...
If someone could actually save the breadboard picture to their desktop and draw the parts on it for me would be great.

You have already done it!.... essentially the components could be laid out almost identical to how you have it in the schematic that you provided.





Here is a simplified schematic:

                 L1
            o---->|----o
            |          |     R1
Probe1 >----o          o----/\/\----< Probe 2 
            |          |
            o----|<----o
                 L2 

....But as 'stamptrol' mentioned, you should experiment.

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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

Chris Savage

One other thing I would recommend is changing the designation for the LEDs to something other than L1 or L2 which suggest inductors even though the symbol is that of an LED.

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Chris Savage
Parallax Tech Support
csavage@parallax.com

Paul Baker

How's this:



You don't have to follow the exact hole placement, you just have to make sure the connections are made in the same row (the numbers), where they are in the column (the letters) isn't important, or which row number you use.

The green, lavender, magenta and yellow lines show how holes are connected internally to the breadboard, holes on the same color are connected to each other, holes of a different color are not connected. This pattern is repeated for the entire board. The busses (red and blue) are connected as shown by the red and blue lines over the holes, this is repeated for all bus lines.

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1+1=10

StarMan

A little off-topic but I have to ask,·Paul, how do you mark up a jpeg like that?

Chris I.

Paul Baker

All I used was two copies of Microsoft Paint (the pitiful excuse for a drawing program included with windows) opened with the two pics he provided, cut and paste from one window to the other, and draw the lines. I can do the job 10x better with the Adobe Suite I have at home.

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1+1=10

StarMan

Thanks

A_Guy_Who_

Paul, I have a 9volt power suppy hooked up to the three knobs that are built in to the breadboard and those connected by wires to the top of the breadboard so how would I connect the top (the two top rows, where the two wires from the powersupply are at) to the two middle halfs so that the leds will light up?

Here's how it looks:

Paul Baker

Using the two probes, your circuit is a polarity detecttor. If you place one probe in the blue bus and the other in the red, one of the LEDs will light. If you reverse the two wires the other LED will light.

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1+1=10

LoopyByteloose

Heh. Heh. FYI, Save that blank Breadboard image. Very handy.

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"When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)

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