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Doing some research on recording NTSC digitally
from All About Circuits Forum
(2010/9/4 9:33)
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I'm hoping to find a rather simple and cheap solution to capture, compress and record a NTSC video input. I'll probably be using ADV7180 for capturing a NTSC signal and converting it to 8bit YCrCb. I'm hoping to use a FPGA for compression and as a storage controller for a fast SD card. I guess the design will also require several RAMs, maybe other ICs I haven't thought about... I'm fairly new with video and just started researching this field, so any tips you can throw at me will be a huge help. Am I in the right direction here? Should I use a dedicated IC for the compression? Are there any development kits to help me out?
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What is this.....?
from All About Circuits Forum
(2010/9/4 9:32)
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I want to know what is IGBT..........?
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laplante motor reversal
from All About Circuits Forum
(2010/9/4 8:44)
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i have a laplante 220 v single phase 5hp motor currently in CW rotation, that i want to reverse, i have followed the diagram and the motor continues clockwise rotation, it's specs are model F184T5S4C P/N 240023 CW rotation L1 to T1,T5 L2 to T4,T8 CCW rotation L1 to T1,T8 L2 to T4,T5 what is the problem? thanks in advance
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MOSFET gate drive from 100VAC line
from All About Circuits Forum
(2010/9/4 8:39)
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Hi folks, This post is related to my previous one http://forum.allaboutcircuits.com/showthread.php?p=273818#post273818 but is an entirely different problem hence the new thread. I have a generator control circuit that drives a FET (N-Channel Enhancement mode) with a PWM signal to regulate the field current. The circuit is needs to be supplied from a stator winding that, due to a couple of small permanent magnets on the field rotor, only outputs about 12VAC at start-up. Obviously this is quite enough to adequately drive the FET gate but once energised, when the FET turns on, the same stator winding produces anything up to 130VAC and will be delivering several amps, all be it pulse width modulated via the FET, to the field rotor. My drive circuit is currently simple and ineffective:- Across the rectified output of the stator winding I have a large dropping resistor in series with a 10V zener with the fet gate at their junction. The FET source and zener cathode share t ...
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pure sine wave inverter design techniques
from All About Circuits Forum
(2010/9/4 8:00)
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Dear Friends, low cost square wave inverters use two 180 degrees out of phase square waves to drive a centre tapped step-up transformer.I have once made one successfully with single 12 V battery source But now I want to design pure sine wave on the same lines.I am trying to produce two positive halves of a sine wave 180 degrees out of phase.I have done so by passing sine wave from inverting and non inverting amplifiers separately and then clipping negative halves.But now I am trying to amplify both positive halves using non inverting opam amplifiers but not getting the desired output though working fine in simulation. Actual problem is designing non inverting opam with single supply and ground reference. Any practical ideas please.
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The fullerene animation in Google today
from All About Circuits Forum
(2010/9/4 7:54)
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Today, Google shows embeded in their logo an animation of the "fullerene". That thing is blocking my PC, taking 98% of the resources! It seems that I should have a most powerful one, just for that.
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AC Sensing - Generator control
from All About Circuits Forum
(2010/9/4 7:45)
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Hi folks, This isn
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HELP! Battery Charger
from All About Circuits Forum
(2010/9/4 6:53)
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Hello again folks, I've got this bosh charging unit that I really need to fix. The symptoms are everytime its plugged in it goes "bang" so I know there is a short somewhere but I cant seem to find it. Lucky I have another bosh charger exactley the same type that works so I have been able to swap compoments round and see whats working and whats not. Here are some pictures: http://img251.imageshack.us/gal.php?g=sdc10228w.jpg so far I have tested from the 230v ac supply: Capacitor - Working NTC 15K @ 25*c - Working 100UF 400v Capacitor - Working Transformer - Working P5NK80Z MOSFET - ( the one mounted on the heatsink next the the incoming 230v ac supply ) originaly faulty but has been replaced - Working 4 x DIODES that you can see I've replaced - All were faulty but now been replaced so are working inductor/transformer - ( the one with the silver bar and equal coper windings on each side) - Working Yellow inductor - working FAST EFFICIENT PLASTIC RECTIFIER ...
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Could this be the future?
from All About Circuits Forum
(2010/9/4 6:18)
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Hello, I saw this video on youtube ( Future of Screen Technology): http://www.youtube.com/v/g7_mOdi3O5E Bertus
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FM conversion
from All About Circuits Forum
(2010/9/4 5:45)
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hi everyone, i am a newb to this forum and wanted some help regarding my projected. can a 100MHz frequency modulated signal be converted to 900MHz?
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