betwixt
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Yesterday, 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 | 251 view(s)
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Yesterday, 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 | 306 view(s)
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Yesterday, 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...4 replies | 249 view(s)
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Yesterday, 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 | 615 view(s)
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Yesterday, 09:18Yes, with 50+ years of experience, much of that designing test equipment! Brian.10 replies | 251 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 | 251 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 | 238 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 | 251 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 | 238 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 | 389 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 | 615 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 | 389 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...4 replies | 249 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 | 306 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 | 306 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...61 replies | 2222 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...61 replies | 2222 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...8 replies | 384 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...61 replies | 2222 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...20 replies | 647 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...61 replies | 2222 view(s)
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26th March 2020, 20:58betwixt replied to a thread How to mitigate large area ground current loops in large arrays of paralleled SMPS's? in Power Electronics"circulating currents" doesn't really tell you anything, all currents 'circulate' to be able to do anything useful. If they mean ground loops, that...3 replies | 231 view(s)
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26th March 2020, 17:18betwixt replied to a thread How to mitigate large area ground current loops in large arrays of paralleled SMPS's? in Power Electronics"Large" is a relative term. Compared to the total power I would think noise relatively unimportant and the relatively sluggish response of the power...3 replies | 231 view(s)
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26th March 2020, 09:27The result is a boolean 0 or 1, it can't be anything else so you can re-write the code like this: void ack(){ if (ACKSTAT_bit) UART1_Write_Text("No...20 replies | 743 view(s)
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25th March 2020, 23:06betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsThink of the SCR as being a normal diode after being triggered. Substitute a real diode in the schematic and you will see what I mean. In conducting...61 replies | 2222 view(s)
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25th March 2020, 21:51betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsThat is correct, and it is what the oscilloscope shows. The negative half cycles are when the SCR is NOT conducting, remember it only conducts in...61 replies | 2222 view(s)
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25th March 2020, 15:19What I'm not grasping is WHY the chassis can't be a circuit conductor. Making it so would greatly simplify the EMC problem as there would be no...11 replies | 556 view(s)
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25th March 2020, 15:06betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsTo reiterate: the trigger voltage is applied between the cathode and gate , that means if you lift the cathode voltage, the gate voltage has to be...61 replies | 2222 view(s)
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25th March 2020, 09:39If I understand the problem correctly: 1. you have a 'chassis' (presumably the outer casing of the base unit) that should have no signals on it...11 replies | 556 view(s)
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