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## 2017年10月28日

### 当前版本： oldturkey03 , 2017年10月28日

#### 文本:

 Keep your 9V AC adapter. Connect your LED strips in series. Use a resistor from your adapter to the LED strips. To figure out the size of the resistor use R = (V1 - V2) / I R=(9-4.5)/IYouYou do need to know what LED's you have and how many. Typical values for LEDs are are: Keep your 9V AC adapter. Connect your LED strips in series. Use a resistor from your adapter to the LED strips. To figure out the size of the resistor use R = (V1 - V2) / I R=(9-4.5)/IYouYou do need to know what LED's you have and how many. Typical values for LEDs are are: Red LED: 2V 15mA Green LED: 2.1V 20mA Blue LED: 3.2V 25mA While LED: 3.2V 25mA After thatTo figure out the size of the resistor use R = (V1 - V2) / I R=(9-4.5)/I(9-4.5)/0.024.5/0.02=225 ohms (easiest available resistor would b a 230ohm resistor)Or you can use [http://ledcalculator.net/|this calculator ]tocalculator]to figure out how to wire it by using resistors. After thatTo figure out the size of the resistor use R = (V1 - V2) / I R=(9-4.5)/I(9-4.5)/0.024.5/0.02=225 ohms (easiest available resistor would b a 230ohm resistor)Or you can use [http://ledcalculator.net/|this calculator ]tocalculator]to figure out how to wire it by using resistors.

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## 2017年10月28日

### 编辑： oldturkey03 , 2017年10月28日

#### 文本:

 Keep your 9V AC adapter. Connect your LED strips in series. Use a resistor from your adapter to the LED strips. To figure out the size of the resistor use R = (V1 - V2) / I R=(9-4.5)/I Typically 20mA (.02A)for LED. So if your Light has 5 LED's that would give you 100mA (0.1A)R=(9-4.5)/0.2A (two light trips with total of 10 lights)R=22.5 ohmsOnly issue here would be that it would helpYou do need to know what Voltages your LED's you have and how many. Typical values for LEDs are rated for. Typically, the forward voltage of an LED is between 1.8V and 3.3VI'd go with a 3.3V LED and would:Red LED: 2V 15mAGreen LED: 2.1V 20mABlue LED: 3.2V 25mAWhile LED: 3.2V 25mAAfter that use a 30ohm resistor[http://ledcalculator.net/|this calculator ]to figure out how to wire it by using resistors. Typically 20mA (.02A)for LED. So if your Light has 5 LED's that would give you 100mA (0.1A)R=(9-4.5)/0.2A (two light trips with total of 10 lights)R=22.5 ohmsOnly issue here would be that it would helpYou do need to know what Voltages your LED's you have and how many. Typical values for LEDs are rated for. Typically, the forward voltage of an LED is between 1.8V and 3.3VI'd go with a 3.3V LED and would:Red LED: 2V 15mAGreen LED: 2.1V 20mABlue LED: 3.2V 25mAWhile LED: 3.2V 25mAAfter that use a 30ohm resistor[http://ledcalculator.net/|this calculator ]to figure out how to wire it by using resistors.

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## 2017年10月28日

### 原帖由： oldturkey03 , 2017年10月28日

#### 文本:

```Keep your 9V AC adapter. Connect your LED strips in series. Use a resistor from your adapter to the LED strips. To figure out the size of the resistor use  R = (V1 - V2) / I R=(9-4.5)/I

Typically 20mA (.02A)for LED. So if your Light has 5 LED's that would give you 100mA (0.1A)

R=(9-4.5)/0.2A (two light trips with total of 10 lights)

R=22.5 ohms

Only issue here would be that it would help to know what Voltages your LED's are rated for. Typically, the forward voltage of an LED is between 1.8V and 3.3V

I'd go with a 3.3V LED and would use a 30ohm resistor```

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