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Resistor

Pre-resistor

Like already in the chapter current described for LEDS a pre-resistor is absolutely necessary!

An LED possesses nearly no internal resistance and if current is put on, there will be a short-circuit because unlimited current would flow through. In order to let an LED shine "correctly" and for long time, one must limit thus current flow with a resistance.

For LEDS the so-called "forward bias" voltage will indicate.
The forward bias voltages is that voltage, which an LED begins to shine and which forms at the LED during radiation. If the voltage at the LED sinks under the forward bias voltages, then no more current flows and... darkly it stays. If the operating voltage is higher and the correct pre-resistor is available then the LED regulates itself on the forward bias voltages and the remaining voltage de-energize at the resistance.

What is RESISTANCE?
carbon-layer-resittance The less free electrons in certain materials, which is present resistance, e.g. the carbon(carbonlayerresittance), are available the less it for a current flow in the electric circuit. If e.g. a broad, slow river is forced to flow by a short tightness then it becomes rapid on this short distance and forms a very fast, strong river.
filamentThus it behaves also in an electric circuit. The resistance R (a tightness), let only few free electrons per time throu and gives thereby to the entire electric circuit the size of the current flow (serial connection). The free electrons can flow in leaders nearly unhampered, but in the resistance they must "rub" itself at the bound electrons. So strongly that the resistance becomes sometimes warm. The bulb e.g. shines, because the thin wire(Wolfram) begins to glow under the influence flowing through the current (friction). Therefore the bulb is so uneconomic and produces much more heat than light.

With a resistance the resistance material is applied on a ceramic stick and covered with a protective layer. The inscription takes place in the form of color rings. Apart from the resistance value also the accuracy class is indicated.

The color code:

The color code is read on the basis of the ring, which is more near to the edge of the resistance.
The first two rings stand for two numbers of the resistance value in ohms.
Resist with high accuracy (metal layer resistors) have mostly 5 or 6 rings.
For 5 rings the first three indicate the values, ring 4 the multiplicator and ring 5 the tolerance.
A sixth ring indicates to the temperature coefficients.

Example:
Compare with the table
A resistance with color rings yellow, violet, brown and gold has a value of = 470 Ohm with a tolerance of 5%.
Example:
100 Ohm = brown, black, brown
220 Ohm = red, red, brown
330 Ohm = orange, orange, brown
470 Ohm = yellow, violet, brown
1 Ohm = brown, black, red
Color 1.Ring
1.Value
2.Ring
2.Value
3.Ring
3.Value
4.Ring
Multiplication
5.Ring
Tolerance
non - - - - +/- 20%
Silver - - - x 0,01 +/- 10%
Gold - - - x 0,1 +/- 5%
Black - 0 0 x 1,0 -
Brown 1 1 1 x 10 +/-1%
Red 2 2 2 x 100 +/- 2%
Orange 3 3 3 x 1 k -
Yellow 4 4 4 x 10 k -
Green 5 5 5 x 100 k +/-0,5%
Blue 6 6 6 x 1 M +/-0,25%
Violet 7 7 7 x 10 M +/-0,1%
Gray 8 8 8 - +/-0,05%
White 9 9 9 - -



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LEDS Pre-resistor

SMD-1206 Widerstand 120 Ohm
SMD-1206 Widerstand
120 Ohm
SMD-1206 Widerstand 150 Ohm
SMD-1206 Widerstand
150 Ohm
SMD-1206 Widerstand 180 Ohm
SMD-1206 Widerstand
180 Ohm
SMD-1206 Widerstand 180 Ohm
SMD-1206 Widerstand
180 Ohm
SMD-1206 Widerstand 1k Ohm
SMD-1206 Widerstand
1k Ohm
SMD-1206 Widerstand 22 Ohm
SMD-1206 Widerstand
22 Ohm
SMD-1206 Widerstand 220 Ohm
SMD-1206 Widerstand
220 Ohm
SMD-1206 Widerstand 330 Ohm
SMD-1206 Widerstand
330 Ohm
SMD-1206 Widerstand 470 Ohm
SMD-1206 Widerstand
470 Ohm
SMD-1206 Widerstand 560 Ohm
SMD-1206 Widerstand
560 Ohm
SMD-1206 Widerstand 620 Ohm
SMD-1206 Widerstand
620 Ohm
SMD-1206 Widerstand 82 Ohm
SMD-1206 Widerstand
82 Ohm
SMD-1206 Widerstand 91 Ohm
SMD-1206 Widerstand
91 Ohm
Widerstand 12 Ohm 5W

Widerstand
12 Ohm
5W

Widerstand 120 Ohm 0,25 W 5%
Widerstand
120 Ohm
0,25 W 5%
Widerstand 120 Ohm 1 W 5%
Widerstand
120 Ohm
1 W 5%
Widerstand 15 Ohm 2W 5%
Widerstand
15 Ohm
2W 5%
Widerstand 150 Ohm 0,25 W 5%
Widerstand
150 Ohm
0,25 W 5%
Widerstand 150 Ohm 1 W 5%
Widerstand
150 Ohm
1 W 5%
Widerstand 180 Ohm 0,25 W 5%
Widerstand
180 Ohm
0,25 W 5%
Widerstand 1k Ohm 0,5 W 5%
Widerstand
1k Ohm
0,5 W 5%
Widerstand 1k Ohm 1 W 5%
Widerstand
1k Ohm
1 W 5%
Widerstand 22 Ohm 0,25 W 5%
Widerstand
22 Ohm
0,25 W 5%
Widerstand 22 Ohm 0,5 W 1%
Widerstand
22 Ohm
0,5 W 1%
Widerstand 220 Ohm 1 W 5%
Widerstand
220 Ohm
1 W 5%
Widerstand 27 Ohm 2W 5%
Widerstand
27 Ohm
2W 5%
Widerstand 3,3 Ohm 5W
Widerstand
3,3 Ohm
5W
Widerstand 33 Ohm 5W
Widerstand
33 Ohm
5W
Widerstand 330 Ohm 0,25 W 5%
Widerstand
330 Ohm
0,25 W 5%
Widerstand 4,3 Ohm 1 W 5%
Widerstand
4,3 Ohm
1 W 5%
Widerstand 4,7 Ohm 1 W 5%
Widerstand
4,7 Ohm
1 W 5%
Widerstand 4,7 Ohm 5W
Widerstand
4,7 Ohm
5W
Widerstand 470 Ohm 0,25 W 5%
Widerstand
470 Ohm
0,25 W 5%
Widerstand 5,1 Ohm 1 W 5%
Widerstand
5,1 Ohm
1 W 5%
Widerstand 560 Ohm 0,25 W 5%
Widerstand
560 Ohm
0,25 W 5%
Widerstand 620 Ohm 0,25 W 5%
Widerstand
620 Ohm
0,25 W 5%
Widerstand 680 Ohm 0,25 W 5%
Widerstand
680 Ohm
0,25 W 5%
Widerstand 8,2 Ohm 1 W 5%
Widerstand
8,2 Ohm
1 W 5%
Widerstand 8,2 Ohm 5W
Widerstand
8,2 Ohm
5W
Widerstand 82 Ohm 0,25 W 5%
Widerstand
82 Ohm
0,25 W 5%
Widerstand 82 Ohm 0,5 W 1%
Widerstand
82 Ohm
0,5 W 1%
Widerstand 91 Ohm 0,25 W 5%
Widerstand
91 Ohm
0,25 W 5%
1,0 Ohm Widerstand 2 Watt
1,0 Ohm Widerstand 2 Watt
1 Stück
1,0 Ohm Widerstand 2 Watt
1,0 Ohm Widerstand 2 Watt
1 Stück
1,2 Ohm Widerstand 2 Watt
1,2 Ohm Widerstand 2 Watt
1 Stück
1,2 Ohm Widerstand 2 Watt
1,2 Ohm Widerstand 2 Watt
1 Stück
1,8 Ohm Widerstand 2 Watt
1,8 Ohm Widerstand 2 Watt
1 Stück
1,8 Ohm Widerstand 2 Watt
1,8 Ohm Widerstand 2 Watt
1 Stück
15 Ohm Widerstand 5 Watt
15 Ohm Widerstand 5 Watt
1 Stück
15 Ohm Widerstand 5 Watt
15 Ohm Widerstand 5 Watt
1 Stück
22 Ohm Widerstand 5 Watt
22 Ohm Widerstand 5 Watt
1 Stück
22 Ohm Widerstand 5 Watt
22 Ohm Widerstand 5 Watt
1 Stück
27 Ohm Widerstand 5 Watt
27 Ohm Widerstand 5 Watt
1 Stück
33 Ohm Widerstand 5 Watt
33 Ohm Widerstand 5 Watt
1 Stück
4,7 Ohm Widerstand 2 Watt
4,7 Ohm Widerstand 2 Watt
1 Stück
6,8 Ohm Widerstand 2 Watt
6,8 Ohm Widerstand 2 Watt
1 Stück
33 Ohm Widerstand 5 Watt
33 Ohm Widerstand 5 Watt
1 Stück
27 Ohm Widerstand 5 Watt
27 Ohm Widerstand 5 Watt
1 Stück
62 Ohm SMD Widerstand
62 Ohm SMD Widerstand
1 Stück
42,2 Ohm SMD Widerstand
42,2 Ohm SMD Widerstand
1 Stück
100 Ohm Widerstand
100 Ohm Widerstand
1 Stück
160 Ohm Widerstand
160 Ohm Widerstand
1 Stück
180 Ohm Widerstand
180 Ohm Widerstand
1 Stück
24 Ohm Widerstand
24 Ohm Widerstand
1 Stück
27 Ohm Widerstand
27 Ohm Widerstand
1 Stück
33 Ohm Widerstand
33 Ohm Widerstand
1 Stück
39 Ohm Widerstand
39 Ohm Widerstand
1 Stück
20 Ohm Widerstand
20 Ohm Widerstand
1 Stück
1,2 KOhm Widerstand
1,2 KOhm Widerstand
1 Stück
1,6 KOhm Widerstand
1,6 KOhm Widerstand
1 Stück
820 Ohm Widerstand
820 Ohm Widerstand
1 Stück
910 Ohm Widerstand
910 Ohm Widerstand
1 Stück
10 Ohm Widerstand
10 Ohm Widerstand
1 Stück
62 Ohm Widerstand
62 Ohm Widerstand
1 Stück
75 Ohm Widerstand
75 Ohm Widerstand
1 Stück
56 Ohm Widerstand
56 Ohm Widerstand
1 Stück
51 Ohm Widerstand
51 Ohm Widerstand
1 Stück
91 Ohm Widerstand
91 Ohm Widerstand
1 Stück
82 Ohm Widerstand
82 Ohm Widerstand
1 Stück
68 Ohm Widerstand
68 Ohm Widerstand
1 Stück
1 KOhm Widerstand
1 KOhm Widerstand
1 Stück
110 Ohm Widerstand
110 Ohm Widerstand
1 Stück
120 Ohm Widerstand
120 Ohm Widerstand
1 Stück
130 Ohm Widerstand
130 Ohm Widerstand
1 Stück
150 Ohm Widerstand
150 Ohm Widerstand
1 Stück
2 KOhm Widerstand
2 KOhm Widerstand
1 Stück
200 Ohm Widerstand
200 Ohm Widerstand
1 Stück
220 Ohm Widerstand
220 Ohm Widerstand
1 Stück
240 Ohm Widerstand
240 Ohm Widerstand
1 Stück
270 Ohm Widerstand
270 Ohm Widerstand
1 Stück
300 Ohm Widerstand
300 Ohm Widerstand
1 Stück
330 Ohm Widerstand
330 Ohm Widerstand
1 Stück
360 Ohm Widerstand
360 Ohm Widerstand
1 Stück
390 Ohm Widerstand
390 Ohm Widerstand
1 Stück
430 Ohm Widerstand
430 Ohm Widerstand
1 Stück
470 Ohm Widerstand
470 Ohm Widerstand
1 Stück
510 Ohm Widerstand
510 Ohm Widerstand
1 Stück
560 Ohm Widerstand
560 Ohm Widerstand
1 Stück
620 Ohm Widerstand
620 Ohm Widerstand
1 Stück
15 Ohm Widerstand 5 Watt
15 Ohm Widerstand 5 Watt
1 Stück
22 Ohm Widerstand 5 Watt
22 Ohm Widerstand 5 Watt
1 Stück



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