LM317T Voltage Regulator with Pass Transistor

A regulated 1.25 to 20.8-22V bench power supply ("lab supply") with a 230/16VAC 1.8A transformer and LM317T. Max load current is 1.5A. The box is a bit bulgy, the mains transformer got there very tight.



http://www.youtube.com/watch?v=fqdvXY9md-Y&hl=en

My Cobbeled together N gauge model train layout. an alco C424 life-like train running with no cover because i had to re wire it. it was given to me 15 years ago. my DIY speed controller can also be seen. just an LM317T regulator and a 12V transformer. and in typical cat fashion, Tiger the cat had to check it all out. glad i passed the CAT scan.



http://www.youtube.com/watch?v=hKDixiVk3lM&hl=en

This is a video showing you how to strip a technics 1200/1210 back to its face plate. The reason for doing something like this is either to pain the face plate or to replace it, in either case stripping the turntable back to the face plate is required. Just as an experiment I phoned my local electronics repair shop to get a quote on how much he would charge to do this and he said 20 quid setup charge 40 quid to strip it and 60 quid to put it back together 120 QUID !!!!!!! Thats like 170 dollars I could buy a second hand turntable for that alternatively 85 quid to simply change the face plate thats like 120 dollars, so you are defiantly saving a bomb by doing this yourself. Its not massively difficult you just have to have your head screwed on and pay close attention to where all the bits went, if you think about it the main circuit board, the power circuit board, and the transformer are all joined so youre not going to put them back in the wrong place and you know where the tone arm goes and the pitch fader, and if you have ever switched on a technics turntable you will know where the power switch is, so you cant really go wrong. Information. When soldering on these turntables especially the older models leaded solder is normally used so keep your soldering tip clean after soldering, and mind your fingers because sometimes leaded solder can bubble and it spits and itll burn your fingers. This link is for more detail on removing the screws from the bottom of the turntable ...



http://www.youtube.com/watch?v=CDYgjwdQ55s&hl=en

upload test (1x)PIC16F887A [Microntroller Unit, storage everything and process everything] (1x)20mhz crystal [clock source for the processor] (1x) LM317 [power supply for LED, and LED brightness control] (1x) 10K pot [adjust voltage on the LM317 IC for LED brightess control] (1x) 220ohm resistor [feedback for LM317 IC operation} (1x) 78L05 100ma fix 5V regulator [PIC power supply] (2x) 18pf capacitor [crystal filter] (3x) SN75468 IC [21 column LED cathod current sink] (8x) PN2907A [8 row LED anode current source] (4x) NO pushbutton [for changing menu and character setup] (4x) 0.1uf capacitors [filter noise on pusbutton switch] (1x) 2200uf 10V capacitor [5-voltage line filter] (1x) 8pair-DIP switch (for change mode from programming the PIC to normal operation and also in future, for cascading multiple board ]



http://www.youtube.com/watch?v=ZqFMbjsWD4E&hl=en

We caught up with Jay Leboff and talked about NRG Dock Personal Solar Solutions @ nrgdock.com. This is the first green solar product I have seen that is specifically targeted at re-charging your portable devices. The idea for the product was hatched after he was without power during a storm for several days and needed a way to recharge his cell phone and other portable devices. This product line works with those in rental units or who own a home of their own very clean and slick this is probably one of the most innovative solar products I saw at the Consumer Electronics Show 2008 From their website "NRG Dock's® photovoltaic cell charges its power station, storing energy for whenever you need it. NRG Dock's® regulator ensures the proper voltage for powering and/or charging personal communication devices - including laptops."



http://www.youtube.com/watch?v=vZP39wZqOyI&hl=en

mi rheubus casero que solo me costo 20 pesos ... y funciona re bien



http://www.youtube.com/watch?v=s3aQJYGzblk&hl=en

Power supply 1,2-27V



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