betwixt
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Yesterday, 21:09You just blew my mental picture of you right out of the water Audioguru: multicolored dreadlocks, punk rocker, leather jacket full of metal studs...10 replies | 458 view(s)
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Yesterday, 21:02betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsA capacitor is a capacitor, electrolytic is just one type of construction. The charge is held across the capacitor, regardless of polarity so it...98 replies | 3309 view(s)
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Yesterday, 09:38betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsFollowing on from post #91: I actually used 22 Ohms in series with the Diac but that is irrelevant for this argument. You will notice the same...98 replies | 3309 view(s)
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6th April 2020, 23:51betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsI think we are going nowhere fast. I can't confirm what your simulator tells you because I don't use Windows and as far as I know Proteus doesn't...98 replies | 3309 view(s)
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6th April 2020, 21:36betwixt replied to a thread Is it possible to repair this touch Screen FCP Cable? in Hobby Circuits and Small Projects ProblemsVERY hard to repair properly, especially as there is a screw hole next to the damage. It looks as though someone didn't fit the cable properly and...5 replies | 152 view(s)
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6th April 2020, 11:05Try these tests: 1. using a high current range, briefly use the meter to short out the +5V to ground. The 7805 should go into current limit at...10 replies | 579 view(s)
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5th April 2020, 21:14I'm not sure what is wrong and I'm afraid I can't really afford the time to debug it for you at the moment. The statements are perfectly valid in...8 replies | 812 view(s)
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5th April 2020, 17:38betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsRacing Klaus..... This is a DB3 Diac, 100K resistor and 100nF capacitor: and this is what I see on the scope: Brian.98 replies | 3309 view(s)
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4th April 2020, 19:25betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsWith 100V and 10K in series it is possible the current through the Diac is sufficient that it doesn't turn off. That's why I wanted you to try 100K...98 replies | 3309 view(s)
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4th April 2020, 09:02The current version of MPLABX is 5.30, I strongly suggest you update as the older versions had lots of bugs (some still present!). That is the IDE...8 replies | 812 view(s)
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4th April 2020, 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,...98 replies | 3309 view(s)
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3rd April 2020, 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...98 replies | 3309 view(s)
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3rd April 2020, 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 | 212 view(s)
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3rd April 2020, 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...98 replies | 3309 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 | 497 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...98 replies | 3309 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...98 replies | 3309 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 | 514 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 | 444 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 | 539 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 | 497 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 | 811 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 | 444 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 | 444 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 | 375 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 | 444 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 | 375 view(s)
About betwixt
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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.
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