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My first intention was to design a DC Voltage boost converter to convert 3vdc to 5vdc so that I could power my iPod or any other device requiring 5 volts to charge.  I read about oscillation circuits and boost converter circuits and combined the two.  My results were staggering when I was able to convert 4.5 volts to over 100 volts by accident.  I decided to post an instructable for this instead, for now. If you have any tips to increase the efficiency or output current please comment below, I appreciate any suggestions.

Step 1: Obtain Parts

All components can be found at RadioShack.
     
     PCB
     3 X 1.5 volt Battery Holder
     L1     RF Choke                   100 micro Henries
     R1     Resistor                      10 Ohms
     R2     Resistor                      51K Ohms
     Q1     PNP Transistor          2N3906
     Q2     NPN Transistor          2N3904
     Q3     Power MOSFET         IRF510
     C1     Capacitor                    .01 micro Farads
     C2     Capacitor                    .047micro Farads
     D1     Diode                           1N4148

<p>How can i boost 9VDC-350ma to 9VDC-2ampre</p>
<p>you can reduce resistance, since V=I*R, so if you reduce resistance the current will go further than 350mA, the way you can reduce resistance is by...well removing resistor, or by make your resistor parallel with other resistor. since battery or other voltage source (real life) have internal resistance, you can parallel it with one and another ( but not all voltage source can be parallel with one and another) CMIIW</p>
<p>Can not get more energy out than is put in. Laws of physics and all. His units were given in volts and amp, but it were possible to build a booster to his specs, then for each second it runs it would create more energy than it consumes. </p>
<p>you can reduce resistance, since V=I*R, so if you reduce resistance the current will go further than 350mA, the way you can reduce resistance is by...well removing resistor, or by make your resistor parallel with other resistor. since battery or other voltage source (real life) have internal resistance, you can parallel it with one and another ( but not all voltage source can be parallel with one and another) CMIIW</p>
<p>Next Level impossible bro. use less resistance in your circuit and you will get more amps out of your battery or whatever you need to do. </p>
<p>You can't get more power out than you put in. </p>
<p>You're trying to change 3.15 watts (V*A) of power into 18 watts of power which is impossible. You'll need a power source that can supply at least 18 watts of power.</p>
<p>I would like to convert 18VDC 8A to 100VDC 2.5A</p>
<p>Even at 100% efficiency, no one can boost 18v@8 amps (114 watts) to 100v@2.5 amps (250 watts): Laws of physics, as in energy can neither be <br>created or destroyed.</p>
Need to step up a 12v 300amp power supply to a 18v 300amp power supply without changing the power supplies inside it
<p>Even at 100% efficiency, no one can boost 12v@300 amps (3600 watts) to 18v@300 amps (5500 watts): Laws of physics, as in energy can neither be created or destroyed.</p>
I have some question it is the thing. Can my power amp rates 16 volt can power it by your design??? Pls answer me
<p>it might can power it, however the noise from this circuit will ruin your music though . im suggesting you're using more that 16V then using linear regulator, idk though, im building my diy amp and it was very sensitive to noise</p>
<p>capacitor inductor capacitor (pi filter) will clean up a lot of noise. The second capacitor needs very low ESR rating for best performance from the filter</p>
In are if constant line? Dozens! Look more in wire two. Aloe vera.<br><br>Source: stairs.
<p>please i made this circuit but it can only boost high voltage what if i need to boost a small voltage like that is out of a paltier???</p>
<p>Your issue is two fold. One, by itself the voltage is too low. bump it up with more in series before you boost it. two, the power produced is extremely low and such that drawing even a modest amount of current drops the voltage to unusable levels. You need consider this last point when pairing it with a load, because your not going to pull 5 watts from a device that produces less than a watt. </p>
<p>You can greatly increase the efficiency of a boost converter by using a fast switching Schottky diode like a 1n5711. If it is a low voltage low current application, you can even use a Germanium diode such as a 1n34 or 1n60 as I did in my Instructable (Solar Powered Battery Charger) a few months ago. The increase in efficiency is due to the lower voltage drop across the Schottky or Germanium diodes. </p>
<p>I want to convert 9v to 5v with the ratio of 4.5 amp.How can i convert it,can you please give me instructions.</p>
<p>All you need is a 5V regulator, 4.5 amps is lot though, you need a 25 watt 5V regulator, or 25 i watt 5V regulators.</p>
<p>how much is the amperage on this design</p>
<p>200 mA maximum output current. 1N4148 isn't a very good choice for a power converter.</p>
<p>I want to convert 9v to 5v with the ratio of 4.5 amp.How can i convert it,can you please give me instructions.</p>
<p>is it possible to covert say 50-100mv to 4 or 5v?</p>
<p>I need to convert 12v 7.2A lead acid battery to 450V, to charge a 450V 15000uF cap. How can I do this?</p>
Quick answer: With a step up booster, like what OP made, but stronger.
<p>I was wondering if, with a diode circuit and large enough capacitor and maybe an LED to turn on once capacitor is charged ran after a 5V 1A or 2A USB output that has 200000mAh capacity battery source, I could make a 12-14V output to use as an emergency car battery starter with the car battery that is clamped in parallel? If not, how would you make such a device? Was thinking of another back-up emergency use for the 200000mAh solar power battery bank: <a href="http://www.ebay.com/itm/200000mAh-Solar-Power-Bank-Charger-Battery-Backup-Galaxy-Iphone-US-SELLER-NEW-/111783191331?hash=item1a06cc2323:g:nrIAAOSw3ydV4UDC" rel="nofollow">http://www.ebay.com/itm/200000mAh-Solar-Power-Bank...</a></p><p>Thanks in advance and awesome instructable! </p>
<p>how can i convert 100mv to 6v</p>
<p>It is difficult to get any useful current at 6v from a 100mV source. Even with a 1A source @ 100mV, you'd get maybe 10mA@6V of usable <em>reliable</em> power from any homebrew circuit at 80% efficiency (13mA of theoretical supply would be pushing the boundaries of good engineering margins for a circuit that actually uses 10mA. Remember: good margins often include a +/- count as well as a +/- percentages; it's easy to lose 1-2 mA regardless of the %age, especially for analog circuits. Digital chips/circuits are often more optimized for high input/output impedances (changes in I/O voltage cause transient loads on the power rails, and noise, but these can often be tolerated through careful filtering/bypass/routing/etc., but these rarely use &gt;5V.</p><p>HOWEVER, if you can design your circuit to work at 5v, there are some useful energy harvesting ICs that can provide reliable regulated current from inputs as low as 20mV! I've used the <a href="http://www.linear.com/product/LTC3109" rel="nofollow">LTC3108</a> and <a href="http://www.linear.com/product/LTC3109" rel="nofollow">LTC3109</a> for circuits with low continuous current (more useful) or larger intermittent current needs (i.e. an energy harvester may harvest continuously 24/7 to power a sensor and RF transmitter that may only wake up and transmit for 1 millisecond each minute: even a 1 microamp continuous source can provide milliamps of power for 1 ms/min)</p><p>The LTC3108/LTC3109 also directly provides a wide range of power storage (battery or capacitor charging) and management functions useful for digital circuits or microcontrollers (TI's MSP430 MCU family in particular, draws very little current)</p>
<p>i want to make a buck_boost converter. .can i start it with these components ? what other components should i have. .plz help</p>
<p>how many amps is the input and output</p>
I want to use Arduino for PWM to MOSFET.<br>Is irf840 is feasiable for that or not?<br>Or i go for MOSFET STP55NF06l ??
<p>i can replace the rf choke with an simple 8.2mH inductor?</p>
How can i make boost converter using 9V battery? Nd what are the ratings of all components?plz rly me
<p>If I use a Peltier Cooler attached to processor in my laptop and mix it with this booster, will it charge the battery(currently using 19v 3.42a charger, total 65W).</p>
<p>lushprojects DOT com/circuitjs/circuitjs.html</p><p>IMPORT FILE IN CIRCUIT APPLET </p><p>pastebin DOT com/kf67QtMA</p><p>Tweek it and lets make this work! I tried and get 0 volts out.</p>
<p>I think the issue you are having is that lushprojects cannot properly model the power mosfet. Also, I believe you inserted a P-channel mosfet, and have the source and drain backwards for an N-channel.</p>
<p>I found a 12V to 15V step up converter on Ebay. It has a +/- input and a +/- output wires. If I were going to use this on a car, how would you wire it up having four wires? Could you connect both the negatives to the car's chassis and feed 12V to the converter and 15V to the accessory then ground the accessory to the chassis? Or does it have to be grounded back through the converter? </p><p>This would be used to speed up a wiper motor.</p>
<p>There's a very big chance both negative IN and negative OUT are already connected on the PCB. If so, you can indeed connect GND to the chassis without using extra wires. Be sure you're not driving some special ancient car, which has +12v connected to the chassis though.</p>
<p>where can I get 100uH RF Choke??</p>
<p>Hi, can you help us convert an input millivolts to a higher voltage (around 9v)? Please, it would be a big help. Thank you very much!</p>
<p>This same circuit will probably not work because (just a guess) the transistor will probably need 500 millivolts to 1 volts to turn on. (idk this is what the base-emitter voltage is on some general purpose transistors) Depending on the use, you may want to use an opamp to achieve this. Could we have some more information to help you?</p>
<p>Nice work! Also try using electrolytic capacitor for C2 and a schottky-barrier diode like 1N5822 or 19 for better results. I once accediently made a similar circuit(joule thief) which flashes a 12V10W power LED from a single 1.5v cell.</p>
<p>hey, how can i achieve very high dc voltage like in kv</p>
<p>if i am not wrong, you could use a transformer for that purpose :)</p>
<p>transformer with dc i dont think so </p>
<p>It is very possible. The inductor in this circuit is creating a high voltage from a low voltage because it is being fed pulsating DC from the MOSFET that is fed from the two transistor oscillator circuit.</p><p>Replace the simple induction coil with a transformer that has a very high turn-count secondary, and you'll get much higher voltages. Use an ignition coil, and you'll have exactly what creates a spark in your car. In my 1951 Chevy, an ignition coil, otherwise known as an autotransformer, since the primary and secondary are connected together at one end, creates a very high voltage spark with from 5 to 7.4 volts, depending on whether the car is being started, or the generator is running. A while back I fitted the car with a 'Blaster' brand coil, which only requires about 3 volts to create a good spark, and so I wired it with a relay so that it receives a direct feed from the battery when the starter motor is activated, and then receives reduced voltage through a resistor once the engine is running. </p><p> You could very easily achieve thousands of volts with the 4.5 volts specified above and an ignition coil.</p>
Can I use this circuit to obtain 8v700ma from 3.6v2600ma bettery. How can I do this
<p>How can i boost 9VDC-0.35ma to 9VDC-2ampre</p>

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