![led flashlight driver circuit and sound circuit led flashlight driver circuit and sound circuit](https://m.media-amazon.com/images/I/61CuaA1Hs+L._SL1000_.jpg)
Output voltage: up to 0.5V less than the input voltage (0.5V dropout) Here i'll explain how the circuit works, and what the maximum limits are, you can skip this if you want. R3 power is 0.1 watt, so a standard 1/4 watt resistor is fine. I set the LED current to 225mA by using R3 of 2.2 ohms. R3 power: the power dissipated by the resistor is approximately: 0.25 / R3 LED current is set by R3, it is approximately equal to: 0.5 / R3
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The circuit is a constant-current source, the value of R3 sets the current. Prototyping-boards: i didn't use a proto-board initially, but i built a second one after on a proto-board, there's some photos of that at the end if you want to use a proto-board. for more current you need to put the LED and Q2 on a heatsink (see my notes in other power-led instructables i've done). that limits us to about 200mA LED current. Heat sinks: here i'm building a simple light with no heatsink at all. that's why this circuit is convenient! you can use a wide variety of power sources and it will always light up exactly the same. to power a single LED anything between 4 and 6 volts with enough current will be fine. Power source: I used an old "wall wart" transformer, or you could use batteries. LED: power LED (Luxeon 1-watt white star LXHL-MWEC) Q2: large N-channel FET (Fairchild FQP50N06L) Q1: small NPN transistor (Fairchild 2N5088BU) R1: approximately 100k-ohm resistor (Yageo CFR-25JB series) (I had a little confusion regarding your lay out of the capacitors.)Circuit parts (refer to the schematic diagram)
#LED FLASHLIGHT DRIVER CIRCUIT AND SOUND CIRCUIT HOW TO#
I noticed that when I removed the smaller capacitor, it delivered about 1.5 V AC.ĭuring my first attempt to build this one, it was not clear (to me) exactly how to connect the capacitors on the breadboard. I was thinking that for those with problems, maybe a close up of the breadboard might be helpful.įinally, this delivered 2.5V DC for me, as you state in the article. (I had a little confusion regarding your layout of the capacitors.) I should think that it would also work with a voltage multiplier (using 1N4007 diodes), but what I want to try next is this design with about 300 windings on the toroid (for AC output).ĭuring my first attempt to build this one, it was not clear (to me) exactly how to connect the capacitors on the breadboard. I would imagine just about any low voltage transistor should work with it, such as a 2N3906 or 2222. I needed to have about 1.2 V battery (or more) to light the LED. I noticed that when I removed the smaller capacitor, it delivered about 1.5 VAC.įor me, using the TIP31 transistor, my version did not work with a ‘dead’ battery. The size of the resistor did not appear to matter, as it *also* worked with a 10k ohm for me.įinally, this delivered 2.5V DC for me, as you state in the article. I had a 50 to 10 turn ratio on my much larger toroid. Surprised me because I usually see a larger voltage supply used with the TIP31. I was able to use a much larger toroid and a TIP31 transistor, and it worked just fine. Nice little joule thief circuit, I very much enjoyed this posting. Testing the Simple LED torch using single AA 1.5V Batteryĭav say to me this is very useful! read below: This circuit have a few parts so I assemble them on the universal perforated board as Figure 3.įigure 3. Number 2 of the winding is connected to the collector of the transistor. Number 4 of the winding is connected to 56 ohms resistor.ģ. Short number 1 and 3 together and connect it to the positive part of the 1.5V supplyĢ. L2 is a primary winding coil on 10 turns.īut if no output or the circuit is not working (no oscillation in winding), try to reconnect the winding as follows.ġ. L1 is a feedback winding coil on 5 turns. I use copper wires or #30 AWG magnetic wire. Toroidal core used is recycled from defective CFL. I use this coil inductor : because it is free.
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Now output has voltage about 4.6V (no load) when we apply LED will drop the voltage to 2.6V can drive to Ultra-bright LED.Ĭapacitors-470uF 16V at the input is used to add Optimization of battery voltage. Then it will flow through a diode-1N4007 to rectifier AC to DC voltage and have Capacitors-100uF 16V to filter current to smooth. Therefore at a collector of CS9013 so have a high frequency fluctuating voltage.
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It cause have current through the inductor L2 in the reverse direction. And then the too much current will flow through L1. When we apply the supply voltage to L1 to R1-50 ohms and to bias a base of 9013 transistors, so it conducts current. Which both coils are turned on the same toroidal core like a general transformer. In the simple oscillator generator, we use transistor-CS9013 and coil L1, L2 as main parts. The circuit includes a simple oscillator, a rectifier and dc filter.