betwixt
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Today, 00:31Yes, an ordinary meter will measure voltage up to its maximum frequency. Typically for DVMs that will be a few KHz. You can rectify the signal and...5 replies | 110 view(s)
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Yesterday, 15:32betwixt replied to a thread Rectifier diodes with bypass capīs & gounding speaker basketīs in Hobby Circuits and Small Projects ProblemsThat is just a normal toroidal transformer with primary and secondary on different bobbins. That construction is normally used when very high voltage...40 replies | 3685 view(s)
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Yesterday, 14:30I'm still confused about what this code is supposed to do and in particular how it produces the display. Am I correct in thinking the lines: #define...6 replies | 194 view(s)
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Yesterday, 14:21Looking at data sheets and application notes, the snubber capacitor values range from 3.3nF up to 10nF, 103pF still seems unreasonably low to have...25 replies | 331 view(s)
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Yesterday, 13:02If the schematic is to be trusted, shouldn't C1/R2 be across the rectifier? Is D5 doing anything? 103pF in the snubber circuit seems far too small,...25 replies | 331 view(s)
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Yesterday, 10:08I explained the timing issues to nayakajit87 and how to structure the ISR efficiently in a previous post but it has been ignored. As well as that,...6 replies | 194 view(s)
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21st February 2020, 23:13Most electrical solder contains some silver but higher concentrations are used when soldering some surface mount components with silver doped end...3 replies | 210 view(s)
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21st February 2020, 23:08betwixt replied to a thread Please help power supply dead 110V to 24vdc 5vdc in Service Manuals, Requests, Repair TipsThe big capacitor is fed directly from the bridge rectifier which in turn is fed through the filter and fuse from the AC input. It could be the NTC...7 replies | 228 view(s)
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21st February 2020, 10:10betwixt replied to a thread Please help power supply dead 110V to 24vdc 5vdc in Service Manuals, Requests, Repair TipsTwo points to make here: 1. You show DC voltages across the transformer primary and secondary, you can't measure these voltages with a normal test...7 replies | 228 view(s)
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20th February 2020, 12:14betwixt replied to a thread Rectifier diodes with bypass capīs & gounding speaker basketīs in Hobby Circuits and Small Projects ProblemsWhat is an "R-Core" transformer? We need to backtrack here - regardless of the advice that you don't need them, are you proposing snubbers across...40 replies | 3685 view(s)
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19th February 2020, 14:03Provided you use the specified transistor it should be fine, its internal base resistor will limit the current to a safe level. Brian.3 replies | 205 view(s)
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18th February 2020, 17:21betwixt replied to a thread Displaying the time parameter using Timer interrupt in Analog Circuit DesignAdditionally, please do what I suggested in the ISR. Reduce it to: void interrupt isr(void) { if (TMR1IF) { TMR1IF = 0; TMR1H =...4 replies | 193 view(s)
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18th February 2020, 10:17betwixt replied to a thread Displaying the time parameter using Timer interrupt in Analog Circuit DesignI couldn't read code so badly formatted and commented. Please stick to one style to make it easier to read. I think I managed to unscramble it as: ...4 replies | 193 view(s)
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17th February 2020, 10:01LEDs are already constant voltage devices so there is no point in placing a Zener across them. If reverse voltage may be an issue, a normal diode...3 replies | 260 view(s)
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16th February 2020, 15:34betwixt replied to a thread Where to buy Electronics components in UK for domestic use? in Miscellaneous EngineeringTry Rapid Electronics https://www.rapidonline.com/ they carry vast stocks of components and construction materials and for small deliveries they use...2 replies | 384 view(s)
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15th February 2020, 21:24betwixt replied to a thread Basic 12v Battery VOLTAGE METER, more resolution needed in Elementary Electronic QuestionsThat is exactly right. I will try to explain my reasoning about the shunt regulator method: A diode blocks the flow of current in its 'reverse...21 replies | 1576 view(s)
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15th February 2020, 20:41betwixt replied to a thread Glow LED on specified counter values 0-500 in 89c52 uC in Microcontrollersfrom my post #9: Subtract the increment from the counter then check the modulo for zero. You did it the other way around! Subtracting Counter...30 replies | 1171 view(s)
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15th February 2020, 11:35betwixt replied to a thread Basic 12v Battery VOLTAGE METER, more resolution needed in Elementary Electronic QuestionsAgreed Klaus, but using the diodes as a shunt voltage regulator like that means they have to pass more than the combined current of all the LEDs in...21 replies | 1576 view(s)
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15th February 2020, 11:26betwixt replied to a thread Glow LED on specified counter values 0-500 in 89c52 uC in MicrocontrollersSubtract the base values 10 and 15 from the Counter value and if the result modulo 10 and 15 is zero, turn the LED on, otherwise turn it off. Make...30 replies | 1171 view(s)
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15th February 2020, 10:32betwixt replied to a thread Basic 12v Battery VOLTAGE METER, more resolution needed in Elementary Electronic QuestionsAs I see it, the only purpose for having R7 at all is to drop the LED voltage to about 2.5V across the four diodes. I'm not sure why that is...21 replies | 1576 view(s)
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15th February 2020, 10:20You must understand the problem first. Three phase uses three wires so you cannot 'magic' an independent reference from them unless you use a...10 replies | 606 view(s)
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15th February 2020, 10:06betwixt replied to a thread Waveform saving upon trigger in windows from Oscilloscope in Elementary Electronic QuestionsI have a Tek MSO3032 but I use Linux so the Windows software is of no use to me. For screen capture I simply plug it into my network (I think your...5 replies | 360 view(s)
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13th February 2020, 17:07The LM224 can run off 4V but the highest voltage it can output is Vs-1.5. The information you need is in data sheets, you should be particularly...68 replies | 1654 view(s)
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13th February 2020, 17:00betwixt replied to a thread [SOLVED] Working of Analog and digital convertors with its significance in Analog Circuit DesignNot the top one or the bottom one, the second from the left in the middle column looks like the answer. Or of course you could give us some...1 replies | 157 view(s)
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12th February 2020, 21:39betwixt replied to a thread 3-phase Δ-connected 11kV Open Circuit Fault Detection? in Power ElectronicsThe problem with sensing after the voltage is dropped is the transformer typically sits across two of the phases (delta-Y configuration) so it is...8 replies | 317 view(s)
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12th February 2020, 20:07That depends entirely on whether you want an exact but bigger voltage or one inverted in polarity. The amplification is the same regardless. ...68 replies | 1654 view(s)
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12th February 2020, 09:55That is risky code! Use a variable to hold the LCD data before writing it back, there is no guarantee the lower bits of LATC hold the data on the...12 replies | 691 view(s)
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12th February 2020, 09:37betwixt replied to a thread 3-phase Δ-connected 11kV Open Circuit Fault Detection? in Power ElectronicsAssuming there is a load on the lines, I would use current monitoring rather than voltage monitoring. An open line will not conduct any current but...8 replies | 317 view(s)
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11th February 2020, 23:17betwixt replied to a thread I2C copper trace lost continuity in PCB Routing Schematic Layout software and SimulationI would say a one off problem and not in any way related to the function of the line. Most likely there was the thinnest of copper there due to...1 replies | 214 view(s)
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