I am currently accepting limited mod requests. There is even a two level driver schematic on page Amazon Inspire Digital Educational Resources. Customers also shopped for. Please add the missing information to your question:

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Originally Posted by greenLED.

Alexa Actionable Analytics for the Web. Last edited by thezman; at ledd This might be stupid question, but can you elaborate more on the voltage drop? The experiments showed that the choice of the transistor is very important. Based on what you describe seems like you have something lower than 3 volts since it does turn with 1 battery. The transistor base is supplied through R1 from the converter output. This chart shows 1.5b that all visible light LEDs require at least 1.

Amazon Rapids Fun stories for kids on the go. The two LEDs light up fine.

‘Resistance’ of an LED | LEDnique

If anybody here speaks Czech and wants to comment, correct or improve, feel free to do so. Read the datasheet, and pay attention to the value 40mq R1 in the schematic on page 7.


The LED lighted up. The transistor should have a high gain, to have a R1 resistor as high as possible. Owner, Illumn Join Us on Facebook! When I decreased the resistance of R1, the converter failed. I assume that the first LED consumes 1.

Worked fine, showed up on my phone’s camera as a little purple-ish dot.

You’ll have a difference in voltage between the LEDs and the battery. The DIP switch is just a single pole, all wired in parallel. Basically I developed a mini circuit just to understand concept of electronic circuit.

The resistor value is calculated by subtracting the LED forward voltage from the 04ma voltage, then using the resulting voltage and desired current in Ohm’s Law.

‘Resistance’ of an LED

Share your thoughts with other customers. Front Page What’s New? Is there a small cheap driver that could boost the voltage to 3.

To be exact, I notice that the supply amperage of the converter was mA in first case supply voltage 1. The variation of the output amperage and efficiency for the two settings of converter are shown on fig.


There was a problem completing your request. That means replacing your bulbs less frequently and less bulbs in landfills.

Help – I want to power a 5 mm LED from V alkaline cell

I think that as I have all the components for the above 2 options, option 1 looks the better and simpler choice. I got a new IR led, emitting light at nm. Oed you will have to do something like:. BD, originally used in nf amplifiers with small voltage carswas the second best. What is the efficiency?

If I can find it I’ll come back and post it. Email Required, 1.5g never shown. For your information, I connected the LED in series.