betwixt
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Today, 00:04betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsNO! Diacs do not 'clip' the voltage, that's what Zener diodes might do. There is a special characteristic of Diacs that once they start to conduct,...79 replies | 2585 view(s)
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Yesterday, 21:48betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsI fear we are going backwards.... A 100nF capacitor has a reactance (Xc) of 26.5K Ohms. So in your bottom circuit the voltage across the Diac will...79 replies | 2585 view(s)
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Yesterday, 11:40Both ways will work but one side of P1/P2 is connected to ground or supply so you not have real isolation. In general, it is safer to ground one...2 replies | 127 view(s)
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Yesterday, 09:02betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsOne shot and try a slower timebase speed. What you should see, if the simulation is working, is a repeating sawtooth waveform. The capacitor...79 replies | 2585 view(s)
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2nd April 2020, 21:04I can't see anything obviously wrong but you should keep the wiring as short as possible. The PCB design around the crystal is horrible! I think...7 replies | 406 view(s)
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2nd April 2020, 20:47betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsYou are not reading what Klaus explained - it is current that triggers the SCR but it does come from the discharging capacitor. Your schematic is...79 replies | 2585 view(s)
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2nd April 2020, 09:15betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsBack to basics eagle1109 - if you charge up a capacitor, it doesn't matter what value or what the voltage is, then short it out, how much current...79 replies | 2585 view(s)
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2nd April 2020, 08:51betwixt replied to a thread water flow detection in a pipe in Hobby Circuits and Small Projects ProblemsI agree with Klaus, at least tell us if this is a 'one off' to build at home or a mass produced item, it makes a big difference to the solution. ...6 replies | 312 view(s)
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1st April 2020, 21:25If you haven't got an oscilloscope or frequency counter, try using a mobile phone app that measures audio frequencies (there are many!) and let it...10 replies | 315 view(s)
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1st April 2020, 21:20Assuming the ADC is 10-bits, with 1.097 vREF the ADC would read 373 with 400mV input. Where does the 500 come from in your calculation? For...12 replies | 426 view(s)
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1st April 2020, 12:57Can you show a picture of the screen please. I am trying to see if the dots are being sent to the LCD by the software or if the dots are caused by a...7 replies | 406 view(s)
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1st April 2020, 09:41betwixt replied to a thread Resistance of component bag made of "reddish" ESD plastic? in Elementary Electronic QuestionsVideo #7 is quite honestly nonsense. Did anyone notice the comparison between pink plastic and metal flashed bags wasn't done properly? Pink plastic...17 replies | 673 view(s)
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1st April 2020, 09:18Yes, with 50+ years of experience, much of that designing test equipment! Brian.10 replies | 315 view(s)
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31st March 2020, 17:03I would argue the opposite. It helps to preserve the contacts although there is some additional loss as the capacitor is shorted out and discharges...10 replies | 315 view(s)
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31st March 2020, 15:55The wire will win easily but if this is an energy harvesting experiment you should be aware that a few microwatts of power is all you are likely to...6 replies | 286 view(s)
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31st March 2020, 15:50It isn't necessary to use one at all but I would suggest something in the region of 0.22uF if you insist on using one. These are not user friendly...10 replies | 315 view(s)
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31st March 2020, 13:07I used to listen to New York and Boston stations here in the UK years ago, before the noise pollution became to great. That was on a long wire...6 replies | 286 view(s)
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31st March 2020, 09:07betwixt replied to a thread computer parallel port external relay control in Hobby Circuits and Small Projects ProblemsFrank, it would be helpful to know how you control the parallel port at the moment. Obviously some software is involved and it probably writes...9 replies | 468 view(s)
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31st March 2020, 08:52betwixt replied to a thread Resistance of component bag made of "reddish" ESD plastic? in Elementary Electronic QuestionsAll of this goes around in circles. Static is a fact of life, it isn't the voltage that causes harm, it is the voltage difference when charged...17 replies | 673 view(s)
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30th March 2020, 22:33betwixt replied to a thread computer parallel port external relay control in Hobby Circuits and Small Projects ProblemsThe real problem is finding a parallel port on a PC these days. When one does physically exist you have to jump through hoops to bypass the...9 replies | 468 view(s)
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30th March 2020, 20:59The photographs show a 16x1 LCD. The code is for a 16x2 LCD. In the "inilcd" routine, the line that sets the display geometry is You can edit...7 replies | 406 view(s)
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30th March 2020, 20:41TA = TA + (analogRead(A1)- 500)*vREF/1024*100; Are you sure that subtracting 500 is the correct value. I'm not familiar with the Arduino Nano but...12 replies | 426 view(s)
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30th March 2020, 16:32.... and did you compensate for the zero offset on the MCP9700? The devices are not directly interchangeable. Brian.12 replies | 426 view(s)
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29th March 2020, 00:03betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsFvM - not according to the schematic in post #42. With the pots at minimum resistance it places 240V AC across the 100uF capacitor. Not quite...79 replies | 2585 view(s)
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28th March 2020, 21:45betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsLook at what happens if you set both potentiometers to minimum resistance - you effectively connect the capacitor across the incoming AC. That means...79 replies | 2585 view(s)
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28th March 2020, 21:21betwixt replied to a thread PIC16F877 interface with ds1307 ...RTC running 10 sec slow in MicrocontrollersTimekeeping is internal to the DS1307 so the interface code is unlikely to be the problem. Taking 70 seconds to complete one minute implies the RTC...12 replies | 598 view(s)
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28th March 2020, 00:15betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsThe schematic shows a normal diode but the text calls it a 'trigger diode'. In a real circuit a diac would be used. A diac isn't like a normal...79 replies | 2585 view(s)
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27th March 2020, 21:45The problem with your simple flyback converter is we simply cannot see it. Please post a schematic and tell us where exactly the waveform is being...23 replies | 793 view(s)
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27th March 2020, 21:42betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power Electronics'Ground' in a simulation means the reference point that everything is measured from, it doesn't have to be a connection to the Earth beneath your...79 replies | 2585 view(s)
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