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This video shows how to build a Low rpm, working generator which produces 100 watts at 120 rpm and 200 watts at 170 rpm. DIY Video : How to build a Homemade Air Cooler for your garage using mostly scrap materials. DIY Video : How to build a Homemade PVC Drip Irrigation System for your Garden for under $100 . With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts. The "Ginormous Bug Eye" - 100W LED Build - Laser Pointer Forums - Discuss Laser Pointers Welcome to Laser Pointer Forums! I had a neat 4xAA host that fit the emitter and a glass lens (72mm in diameter) just perfectly. To put the brightness in perspective, it appeared about half as bright as my Quad-SST-90 (which I recently sold). Side-note: One of the neat bi-products of this project, was the realization that I needed a better charging solution for multiple-lithium-ions at once. I look for a high-power LED with adjustable focus lens or collimated with possibility to align the lens location. We like to get the mounted LED with power supply for evaluation, then will order the LED with PCB. Originally Posted by yoled3 I look for a high-power LED with adjustable focus lens or collimated with possibility to align the lens location.
This is a 100 watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. The design is pretty much a standard one, and I'm sure there are commercial units out there that are similar.
The input stage is an LF351 op amp which provides most of the open loop gain as well as stabilizes the quiescent dc voltage. I have never heard any slew-induced distortion on this amp with a CD player's band-limited (22KHz) signal.
The output transistors and thermal compensator (2SC1567) will need to be mounted on a common heat sink - a finned unit measuring 5 in. Design your own jeans, your logo denim jeans  Thank you very much for your more attention to our factory. My Question: would it be better to power it with one 12volt 7.2ah battery or two 12volt 5ah batteries in series equaling 24volts 5ah?
That prompted me to spend some time designing this, a 24 channel current selectable (via dip-switch, probably 500mA and 100m) lithium ion charger.

It has better performance (read: musical quality) than the standard STK module amps that are used in practically every mass market stereo receiver manufactured today. To my knowlwdge, it is not an exact copy of any commercial unit, nor am I aware of any patents on the topology. The op-amp's pole and the pole generated by the 33pf cap and the 470 ohm bias resistor of the MPSA42 dominate.
It used a 40-0-40 volt, 5 amp toroid transformer, a bridge rectifier, and 10,000 uf of filter cap per side.
I suppose that real high-end freaks could pick it to pieces by hitting it with a TTL square wave mixed with a 19KHz stereo pilot tone and crank it up.
Individual TO-220 heat sinks on the circuit board will suffice - the voltage amps dissipate about 1.4 watts each.
This value takes a while to stabilize, and you may have to monitor it over an hour or so during initial setup. No resposibility on the part of the author is assumed for the technical accuracy of the information given herein or the use or mis-use of said information. Working with electricity is dangerous for your life, especially diagrams related to high voltage! This may not be the most practical thing I've ever built, but for a 30-minute project, it was one of the most fun For a long time I've had one of those 100W LED emitter plates kicking around.
So after tossing around a bunch of creative driving ideas, I finally came to the conclusion that using this 100W emitter really wasn't something I wanted to pour a weekend of build time into. I tossed around the idea of using a bunch of tiny LiPo packs, until eventually it hit me - 8x 14250 cells! PCBs are en-route It requires an external 5V 12A power supply, but luckily those are fairly readily available. When I originally built this thing, it was because I needed a 100 WPC amp and didn't want to spend any money.
To experienced builders: I realize that many improvements and refinements can be made, but the idea was to keep it simple, and should be do-able by anyone who can make a circuit board and has the patience not to do a sloppy job. The use of parallel devices increases the ability to drive reactive loads (which can pull a significant current while the voltage waveform crosses zero and puts a high voltage and a high curent across the transistor simultaneously), gives the amp a higher damping factor, and reduces the maximum current each transistor has to supply to peaks (remember, the gain of a power transistor drops as the current increases).
If the higher-power Motorola power transistors are used, it will drive a 2-ohm resistive load without problems (except heat). If very low impedances are expected, raise the bias in the transconductance stage to give more base drive to the output darlingtons or add another current gain stage. I was too lazy to put arrows on the transistor symbols - and I've been using it that way for over a year now.

Total cost for a stereo version should be between $150 and $250, depending on what kind of bargains you can find on the case, transformer, and heatsinks. But more crucially, it really sucks to recharge 8x 14250 cells, especially when you have to use a single-channel Nano lithium ion charger. The 2SC2344 by itself has a rather large collector-base capacitance which is voltage dependent. In this way, the phase lag introduced by the output transistors is not seen by the high-frequency feedback. With this power supply, it produces 100 watts continuous, both channels driven into 8 ohms resistive with no clipping.
This way, you can check the current sharing in the parallel output transistors at the same time and change them if there is a serious discrepancy.
I suggest the use of a ballast resistor - a 60 to 100 watt light bulb in series with the AC mains. The MPSA42 presents this with a low-z and has a C(ob) of only a few pf that is effectively swamped by the 33pF pole-splitting cap. Don't substitute high-fT parts unless you are sure they have adequate second-breakdown capability. With parts of the same date code, they should not be off by more than 10% after it has warmed up. You get a bright flash when the caps charge, and then it goes (almost) out as the idling supply current reaches its nominal low value. In my experience, cheap chinese LED emitters produce about 90% of their full output, when they're at about 50% of their full current (that last 10% bump that you get from doubling their current is often just a gimmick to get the plates the highest possible power rating).
The two compensation capacitors must be type 1 creamic (NPO) or silver mica - with ZERO voltage coefficient. The reason the 2SC1567 was chosen for the output bias regulator is because it is fully insulated - the ECG version will require additional mounting hardware. If the amp draws too much current for whatever reason, the lightbulb will glow brightly, increase resistance, and limit the power to the circuit.
Usually, there will either be a mis-wire (use your DMM) or oscillation (will show up on a scope or RF power measuring device). Compensation capacitor values may need to be adjusted if any significant changes were made.

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