betwixt
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Yesterday, 23:13Most electrical solder contains some silver but higher concentrations are used when soldering some surface mount components with silver doped end...1 replies | 79 view(s)
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Yesterday, 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...6 replies | 159 view(s)
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Yesterday, 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...6 replies | 159 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...37 replies | 3592 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 | 189 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 | 181 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 | 181 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 | 255 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 | 353 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 | 1522 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 | 1117 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 | 1522 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 | 1117 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 | 1522 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 | 595 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 | 349 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 | 1627 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 | 153 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 | 316 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 | 1627 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 | 674 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 | 316 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 | 204 view(s)
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11th February 2020, 23:11betwixt replied to a thread Old capacitor needs replacing not sure what to replace with. in Hobby Circuits and Small Projects ProblemsThey should be fine. They exceed the rating of the originals and are also probably more reliable and effective than the original type too. Brian.15 replies | 1061 view(s)
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11th February 2020, 10:41Certainly it's a timing issue but your code is still much longer than needed. All those "LCD_D4 = (out_char & 0x10)?1:0;" and similar statements are...12 replies | 674 view(s)
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11th February 2020, 09:36Sounds like you are inventing the SMPS concept again! A Zener only works as a clamp in reverse biased direction, in forward mode it works like a...6 replies | 296 view(s)
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11th February 2020, 09:33You have a lot of duplicate code in there making it more difficult to read. Note that writing commands and data to the LCD only differ by the...12 replies | 674 view(s)
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10th February 2020, 22:50betwixt replied to a thread Old capacitor needs replacing not sure what to replace with. in Hobby Circuits and Small Projects ProblemsLook here at the 'Wima' branded capacitors. https://www.rapidonline.com/Catalogue/Search?Query=capacitors&Attributes={%22Voltage%22:} They are...15 replies | 1061 view(s)
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10th February 2020, 20:31betwixt replied to a thread Old capacitor needs replacing not sure what to replace with. in Hobby Circuits and Small Projects ProblemsMust be my eyesight failing... yes, it is 5nF although 50nf would probably work better. There is a small 'Y' near the value and a small 'X' near...15 replies | 1061 view(s)
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