betwixt
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Yesterday, 23:58That is a good sign, for the scan to be full width but that voltage so low indicates a problem in generating the 200V line. The lower that voltage...10 replies | 310 view(s)
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Yesterday, 21:021K is fine if 1V is the minimum output. There is an explanatory note at the bottom of page 1 showing 909 Ohms for 0.9V. The instability could be...3 replies | 73 view(s)
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Yesterday, 20:48Sorry for the delay, I've spent the last day in hospital so I couldn't write back! I suspect the problem is the +200V supply to the video...10 replies | 310 view(s)
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Yesterday, 20:29Likewise but I wonder if the PLL in question is the internal clock multiplier. It would be useful to have some more information. If it is the...3 replies | 127 view(s)
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Yesterday, 20:23Are you observing the minimum load current requirement as shown at the bottom of page 3. The load current must be >1mA over the whole voltage range...3 replies | 73 view(s)
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25th February 2020, 12:44betwixt replied to a thread Looking for a single SMD pin header in Professional Hardware and Electronics DesignWhy not simply use copper pads? Brian.3 replies | 209 view(s)
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25th February 2020, 09:36You didn't look very far. There is a register in that device specifically for setting PWM deadtime. Look at page 170. Brian.5 replies | 220 view(s)
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24th February 2020, 23:15betwixt replied to a thread Specifications beyond data sheet... in RF, Microwave, Antennas and OpticsNo guarantees of course but I would guess it would work over quite a wide range. The lower limit is usually decided by internal gain dropping due to...3 replies | 235 view(s)
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24th February 2020, 23:07I've traced the schematic. My first guess is C756 is faulty. Do you have a voltmeter if I ask you to take measurements? Brian.10 replies | 310 view(s)
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24th February 2020, 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....10 replies | 310 view(s)
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24th February 2020, 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...10 replies | 310 view(s)
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24th February 2020, 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 | 285 view(s)
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23rd February 2020, 16:48A spectrum analyzer would be a far better instrument for measuring at those frequencies! Brian.13 replies | 602 view(s)
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23rd February 2020, 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 | 602 view(s)
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23rd February 2020, 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 | 306 view(s)
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23rd February 2020, 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 | 602 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...43 replies | 3979 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 | 310 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...35 replies | 813 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,...35 replies | 813 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 | 310 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 | 316 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 | 410 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 | 410 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...43 replies | 3979 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 | 252 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 | 249 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 | 249 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 | 316 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 | 536 view(s)
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PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
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