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Step 2Circuit diagrams
The torch was a real cheap model, probably built in China. The wiring did not include any resistors, which is considered a deadly sin in LED circuit design. They simply slapped 52 LEDs in parallel and connected them to the battery via a switch.
As I intend to use the torch mainly with rechargeable batteries, I calculated the following circuit for 3.6 Volts, which is the typical voltage of three NiMH batteries.
Most LEDs could be set in parallel and driven with a single resistor, as they only use 20 mA current. My green LEDs need 30 mA, so I split them up in two groups with one resistor each. The infrared LEDs need a whopping 100 mA each, so I used a resistor for each of them.
Depending on the types and amounts of LEDs you are using, you may need different resistors. This LED resistor calculator may help you on your way.
As I intend to use the torch mainly with rechargeable batteries, I calculated the following circuit for 3.6 Volts, which is the typical voltage of three NiMH batteries.
Most LEDs could be set in parallel and driven with a single resistor, as they only use 20 mA current. My green LEDs need 30 mA, so I split them up in two groups with one resistor each. The infrared LEDs need a whopping 100 mA each, so I used a resistor for each of them.
Depending on the types and amounts of LEDs you are using, you may need different resistors. This LED resistor calculator may help you on your way.
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