betwixt
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Yesterday, 23:48I've never heard of a 74m294 and searching for it turns up hair dye! If you had something that divided the 32KHz by 1000000 without loading the...8 replies | 109 view(s)
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Yesterday, 22:00Only if the multimeter is specified to do so, most will not work above 2 - 3 KHz. The two most important things to measure from a crystal...8 replies | 109 view(s)
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Yesterday, 16:26Remove the two lines that contain 'GIE', they are not needed and could cause other problems including possible 'deaf' periods where serial data is...9 replies | 242 view(s)
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Yesterday, 10:03Are you confusing FT232 and MAX232 perhaps? FT232 = serial to USB converter MAX232 = Voltage level converter usually used in serial TTL to RS232...9 replies | 242 view(s)
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27th February 2020, 16:47What puzzles me is the pins of TX1 suggest it is a metal can package with pins to fit a 14-pin DIL profile. That almost certainly means it produces...12 replies | 355 view(s)
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27th February 2020, 16:37betwixt replied to a thread IC TDA2004R Electrical specifications in Elementary Electronic QuestionsTDA2004 was never a good device. It was designed to go in low cost record players and tape recorders. I think it went out of production in 1996! ...7 replies | 273 view(s)
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26th February 2020, 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 | 437 view(s)
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26th February 2020, 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 | 166 view(s)
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26th February 2020, 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 | 437 view(s)
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26th February 2020, 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...5 replies | 280 view(s)
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26th February 2020, 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 | 166 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 | 249 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 | 266 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 | 253 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 | 437 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 | 437 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 | 437 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 | 320 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 | 652 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 | 652 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 | 333 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 | 652 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 | 4121 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 | 334 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 | 879 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 | 879 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 | 334 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 | 342 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 | 444 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 | 444 view(s)
About betwixt
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- Electronic design, TV production, photography, web site design
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- Retired senior engineer for a test equipment company but still very busy!
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PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
It's better to share your questions and answers on Edaboard so we can all benefit from each others experiences.
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