BradtheRad
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Today, 01:08BradtheRad replied to a thread computer parallel port external relay control in Hobby Circuits and Small Projects ProblemsProgress means we gain something but something may be lost too. With parallel ports gone, we wonder how to send control signals from modern...7 replies | 143 view(s) -
Yesterday, 19:10BradtheRad replied to a thread Samsung GT-P5210 10.1 inch Tablet repair in Service Manuals, Requests, Repair TipsIt's essential that you measure voltage coming from the charger when it's plugged into the tablet. It may not be easy to find suitable test points. ...1 replies | 116 view(s)
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Yesterday, 02:35BradtheRad replied to a thread Dimmer lamp 220v ac (resistor values) in Elementary Electronic QuestionsSimilar projects are discussed in related threads listed further down this page. A halogen bulb is different from ordinary incandescent type....2 replies | 160 view(s)
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Yesterday, 01:33BradtheRad replied to a thread Resistance of component bag made of "reddish" ESD plastic? in Elementary Electronic QuestionsConsider building this static charge detector. Made from a 4011 quad NAND gate. Red led lights for positive polarity, green led for negative. The...11 replies | 293 view(s)
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29th March 2020, 08:02BradtheRad replied to a thread How to adapt (normally) PCI Express x1 to work in PCIe Mini Slot in PCB Routing Schematic Layout software and SimulationYou probably know about installing drivers for new hardware, and looking at Device Manager to see if any device causes an alert. Several...1 replies | 194 view(s)
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28th March 2020, 19:47BradtheRad replied to a thread matching network design question in Analog Integrated Circuit (IC) Design, Layout and FabricationSome definite amount of ohmic resistance ought to be ahead of your filter. Looking closely, that appears to be a resistor just above the waveform...9 replies | 309 view(s)
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28th March 2020, 07:19BradtheRad replied to a thread Help needed; Check of PCB and some other questions in Hobby Circuits and Small Projects ProblemsThen what you installed may be sufficient. The source of noise isn't much different from the buzzing that comes through an amplifier when the...14 replies | 784 view(s)
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27th March 2020, 21:26The hatched area is the region that generally works for low voltage, low current circuits (I think). The upper and lower limit are approximate (obere...5 replies | 524 view(s)
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27th March 2020, 09:49BradtheRad replied to a thread PAC and PSTB for switched capacitor integrator in Analog Circuit DesignI think your schematic ought to include some amount of resistance at each incoming voltage. And for good measure put a resistance in series with...1 replies | 181 view(s)
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27th March 2020, 09:34BradtheRad replied to a thread Help needed; Check of PCB and some other questions in Hobby Circuits and Small Projects ProblemsIt sounds as though you have 50kHz pulses running through tracks separated by 1 mm, for a few feet of length. There is a certain amount of inductance...14 replies | 784 view(s)
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27th March 2020, 09:04BradtheRad replied to a thread Looking for an non-invasive sensor for a fitness machine in Hobby Circuits and Small Projects ProblemsI imagine there's a metal arm or pivot moving just inside the housing, which you could detect with a strong magnet. And the magnet may produce...4 replies | 348 view(s)
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26th March 2020, 05:57BradtheRad replied to a thread need translation from Chineese to English in Service Manuals, Requests, Repair TipsThere are free translation websites. One method is to highlight the characters (by mousing through them), then copy and paste. (Example,...3 replies | 357 view(s)
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26th March 2020, 00:29BradtheRad replied to a thread Help needed; Check of PCB and some other questions in Hobby Circuits and Small Projects ProblemsI can see why all led's and sensors must point 90 degrees from two flat PCB's facing each other. The length of your narrow circuit board (1050 mm)...14 replies | 784 view(s)
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24th March 2020, 23:01BradtheRad replied to a thread Help needed; Check of PCB and some other questions in Hobby Circuits and Small Projects ProblemsYour image is a long, thin pcb. Detail is visible by enlarging it. Did you intend for your sensor data sheet to be a duplicate of your pcb? Is...14 replies | 784 view(s)
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24th March 2020, 10:59vivekroy replied to a thread Differential comparator with reference comparison voltage level in Analog Integrated Circuit (IC) Design, Layout and FabricationThe paper references to Razavi's textbook for the comparator xD5 replies | 428 view(s)
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24th March 2020, 10:15vivekroy replied to a thread Differential comparator with reference comparison voltage level in Analog Integrated Circuit (IC) Design, Layout and FabricationIf it was a common mode feedback circuit, it would have compared (voutp+voutm)/2 with VR. From the description by the author it seems like it...5 replies | 428 view(s)
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24th March 2020, 08:25BradtheRad replied to a thread [SOLVED] Effect of LC filter in simulation of BTL H-Bridge inverter? in Power ElectronicsThe screenshots are Falstad's animated simulator. Free to download and use at (your computer needs to have Java installed): falstad.com/circuit ...12 replies | 554 view(s)
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24th March 2020, 06:37Yes, there it is, looking at the graph in the Elemente book link (looks like page 211). The graph relates frequency to Zo... and Zo is...5 replies | 524 view(s)
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24th March 2020, 00:41Diluted hydrogen peroxide is germicidal and non-allergenic. There are claims that ultra-violet lamps disinfect surfaces. A review article is in...7 replies | 901 view(s)
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24th March 2020, 00:32A high L:C ratio takes more cycles to grow to a steady state from power-up. It also rings for a longer time after shut-off. The reason is that it...5 replies | 524 view(s)
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24th March 2020, 00:20BradtheRad replied to a thread [SOLVED] Effect of LC filter in simulation of BTL H-Bridge inverter? in Power ElectronicsThose capacitors to ground provide a direct path for damaging high current, if LC resonance was instigated by switching at certain frequencies. ...12 replies | 554 view(s)
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22nd March 2020, 06:41Yes, if it's available. What is your power source? It may be easier to convert that. It's likely the laptop can operate on 19V... maybe even 18V or...10 replies | 616 view(s)
About BradtheRad
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- Born 1953. Some college.
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