Home  /   40MA 1.5V LED DRIVER

Would one of the circuit boards from one of the cheap Dorcy AAA lights work in a situation like this? Home Questions Tags Users Unanswered. Actually, no I don’t. View shipping rates and policies. Typical ranges go from 1. It says 5v reverse voltage and 1. Well, I will probably use it as a camp marker and in tent illumination.

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The transistor should have a high gain, to have a R1 resistor as high as possible.

The 3 batteries AAA size are 1. DaveO God Member Posts: Instead you will have to do something like: BD, originally used in nf amplifiers with small voltage carswas the second best. AmazonGlobal Ship Orders Internationally. Sign up using Email and Password.

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Two LEDs in series require at least 4. The LED lighted up. I got the circuit from a library I believe.

I have done it with through hole and SMT components. I have a few L linear voltage regs and small heatsinks in the hobby box, so reduce the power from 12V to 8V, and then use a ohm 0,25W resistor to the LEDs. Save money and reduce energy usage from the electrical grid.


‘Resistance’ of an LED

What voltages did you try? Originally Posted by Illum.

I think that as I have all the components for the above 2 options, option 1 looks the better and simpler choice. I was quite successful in achieving better efficiency and performance using voltage of 1.

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

Front Page What’s New? The voltage over a component is often called the voltage drop over it. For more than 1 LED start at the battery’s positive contact and walk through the loop, subtracting voltages as you pass components, until you arrive at 0V when you return to the battery. For Homemade projects I’d consider buying some small perf board to work with, if you are unsure with the circuit layout, get yourself a breadboard and test the circuit before soldering them in place.

Basically I developed a mini circuit just to understand concept of electronic circuit.

Image resizer by SevenSkins. But if you need the full brightness of the LED, you’ll need the external transistor circuit. You normally control the LED current using a resistor in series.


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Convert battery powered LED light to power supply – Resistors

40mma Brattain Member Posts: Not as low as the Joule thief, but once the circuit is running, you’ll run a D-cell for a looooooooooooong time. Originally Posted by Calina. Better yet, I buy most of my passive components from AllElectronics L1, Given the current you’ll be working with, I think ceramic would be sufficient, but in the future if you want to expand on it I’d consider something bigger C1, While I would rather work with monolithic caps as thay are not as prone to chipping as ceramic disc caps The inspiration for this circuit was lights described at http: Results 1 to 30 of Even if I didn’t achieve the requested goal 4 LEDsthe circuit has some interesting characteristics.

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