LM317T Voltage Regulator with Pass Transistor

This is a 60 watt 3.5-40 volt in and 5-40 volt out DC to DC step up converter. I got it off ebay for $15, including shipping. I was thinking of using this to step up the voltage of my slow turning vertical turbine to charge a 12 v battery. It can, of course, be used for other purposes. The output voltage is easily adjustable and the footprint is very small (2"x2")



http://www.youtube.com/watch?v=jv_dyEX-Lsw&hl=en

My new XR2206 function generator. Based on an ELEKTOR circuit diagram from 1977. The XR-2206 is a monolithic function generator integrated circuit. Features: + Square, sine, triangle, sawtooth wave output or pulses. + Frequency range from 10 Hz to around 200 kHz. + Amplitudes from around 0.01 V to 4 V (or more) + Audio output is possible For demonstration a digital storage oscilloscope DSO 062 from JYE-Tech and a speaker were connected to the output. Frequency can be adjusted by a ten turn wirewound precision potentiometer + multiplicator (x1, x10, x100, x1000) + another x2 multplicator. Surprisingly most of the 1970s electrical components are still available. So it is ~ 99% the 1977 model. Only the original voltage regulator had to be replaced by a 7812 . It should be noted that nowadays simple sound cards are better and cheaper function generators. However, I like this old technique. ;-) Elektor kindly gave me the permission to post the links to the original articles from 1977 (German and English language): www.elektor.de/120068 and www.elektor.com/120068



http://www.youtube.com/watch?v=KPtsgFw5Fno&hl=en

Recently I have been thinking about the idea of converting my old Dick Smith Q-1280 oscilloscope I don't use anymore into a video monitor for composite video and NBTV and so have been looking around for schematics to do the job. YouTube user 256byteram kindly provided me with a schematic he made for his video to scope project www.youtube.com so I went to Jaycar bought all necessary parts and constructed the circuit. I then realized I needed a +/-12V power supply and had a 7812 regulator but no 7912 regulator and couldn't be bothered driving to Jaycar so from some site I found an alternate +/-VDC circuit that takes +VDC input, uses a 555 timer to create a low AC voltage and rectifier circuits to create the +/- DC voltage, so I adapted that and inputting a 14VDC power supply I get +/-12.5VDC out to power the video-scope circuit. Anyhow after construction and fixing some of my construction mistakes I hooked up the circuit to my two other oscilloscopes that have X, Y and Z input and fired them up and unfortunately no picture appears but instead I get a funky looking polygon with a raster like display on the inside, the polygon does react to the video input but no picture. Also I am finding when I check the + and - voltage rails I am getting 0 to +/-2V while the circuit is in operation, and when power supply circuit disconnected from video-scope circuit I get the normal +/-12.5VDC. I wondered if there is any shorts, I did check over the circuit and fixed my construction errors ...



http://www.youtube.com/watch?v=Mh4Eg60dkWo&hl=en

A small Jacob's Ladder, driven by a 555 timer circuit quite similar to the Ainslie clock in all its variations. The 2n3055 transistor, the automotive ignition coil, and the big diode are wired up exactly as the remainder of the Ainslie "heater" circuit. The only real difference is in the choice of timing R and C in the 555 circuit, and the 10-turn pots for precise control of frequency and duty cycle. And yes, in this circuit the battery voltage will actually appear to rise as the circuit runs. For example the no-load voltage when I started was 12.6, and when I finished this demo it was up to 12.8. So it must be a massively overunity Jacob's ladder!! The circuit diagram jpg may be downloaded from www.mediafire.com



http://www.youtube.com/watch?v=VNL8QTS0sM0&hl=en

This radio could be a really magnificent performer but it's let down slightly by distorted RX audio on SSB and it has a small frequency error of about 150Hz. The noise blanker performance is the very best I have ever come across and the receive sensitivity is superb. It has a far greater signal to noise ratio, on FM, than any of my other radios. AM receive is nothing short or spectacular and FM isn't far behind. For £145 brand new in the box, you have a 50W SSB radio with variable power on all modes, thanks to its two IRF520 output devices. 15W carrier on AM, swinging up to around 45W on a whistle. A multitude of menus plus PC programming makes this a very versatile radio indeed. Great for 10 and 11 Metres or you can program it to do both. Whether or not these radios will stand the test of time has yet to be seen. The lead free ROHS compliant solder, used during the manufacture of these radios, is a serious cause for concern as it seems to be more prone to giving dry solder joints. The quality of the components seems to be at least on a par with the CB radios of old, if not better. There are a few nice touches, such as the presence of a crystal filter in the first intermediate frequency stage when using AM or FM. The PA transistors have a more than adequate heat sink but the AM/FM TX voltage regulator relies on the main chassis for its heat dissipation. I look forward to seeing Simon Parker's review of the V5.1 or V6? when it is released by the factory. This is my final ...



http://www.youtube.com/watch?v=_sAmOUTuvnY&hl=en

rebuilderinabox.com - Go here to help locate the proper rebuild kit and the rest of this video for your vehicle.



http://www.youtube.com/watch?v=NaQqJRAZuEI&hl=en

www.microchip.com This reference design provides an easy method to evaluate the power, and features of SMPS dsPIC® Digital Signal Controllers for high wattage AC - DC conversion application. Discover the many benefits of digital power control implementation in this reference design. The SMPS AC - DC Reference Design unit works with universal input voltage range, and produces multiple DC outputs. The design is based on a modular structure, which features three major power stages; the input stage, intermediate stage and the third stage, a Point of Load. The input stage is a PFC Boost Converter, the intermediate stage is a Phase-Shifted Zero Voltage Transition (ZVT) Converter, which includes ZVT Full Bridge Converter and Synchronous Rectification, and the third stage is Single-phase and Multi-phase Buck Converters. This reference design uses two dsPIC33F16GS504 devices; one used for the PFC Boost Converter and ZVT Full Bridge Converter, while the other dsPIC® DSC is used for Single-phase and Multi-phase Buck Converters.



http://www.youtube.com/watch?v=snAOXUSACOU&hl=en