betwixt
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Today, 18:14Those a 'flyback lines', it's the dots that normally make the picture as they scan back to the top of the screen ready for the next visible raster....3 replies | 86 view(s)
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Today, 12:53Can you post a picture of the horizontal lines or at least describe them please. Are they overlayed on a normal picture or are they against a...3 replies | 86 view(s)
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Today, 09:01betwixt replied to a thread Need to ensure SMPS output filter has at least 10mR of ESR...use "ESR resistor"? in Power ElectronicsOne milliOhm is incredibly small, the chances are the ESR of the capacitors is higher than that already and the added resistance of the connection to...7 replies | 186 view(s)
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Yesterday, 16:48A spectrum analyzer would be a far better instrument for measuring at those frequencies! Brian.13 replies | 477 view(s)
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Yesterday, 10:03You stand absolutely zero chance of a multimeter reading that! Consider that when using frequencies in that range you need at the very least...13 replies | 477 view(s)
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Yesterday, 09:55betwixt replied to a thread Questions of mechanical to electrical energy transfer in Power ElectronicsFollow Brad's advice but please bear in mind that nobody makes a 'dynamo' charger specifically for the voltage and current you need. I cases like...4 replies | 239 view(s)
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Yesterday, 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...13 replies | 477 view(s)
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22nd February 2020, 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...42 replies | 3836 view(s)
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22nd February 2020, 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 | 278 view(s)
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22nd February 2020, 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...34 replies | 682 view(s)
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22nd February 2020, 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,...34 replies | 682 view(s)
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22nd February 2020, 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 | 278 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 | 274 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 | 379 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 | 379 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...42 replies | 3836 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 | 235 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 | 230 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 | 230 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 | 298 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 | 486 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 | 1686 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 | 1351 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 | 1686 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 | 1351 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 | 1686 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 | 653 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 | 397 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 | 1776 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 | 174 view(s)
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