betwixt
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Yesterday, 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...5 replies | 132 view(s)
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Yesterday, 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...5 replies | 172 view(s)
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Yesterday, 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...5 replies | 132 view(s)
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Yesterday, 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...5 replies | 172 view(s)
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Yesterday, 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 | 315 view(s)
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Yesterday, 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...16 replies | 501 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 | 315 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...1 replies | 162 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...8 replies | 248 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.8 replies | 248 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...59 replies | 2106 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...59 replies | 2106 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...4 replies | 234 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...59 replies | 2106 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 | 610 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...59 replies | 2106 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 | 218 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 | 218 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 | 688 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...59 replies | 2106 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...59 replies | 2106 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 | 529 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...59 replies | 2106 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 | 529 view(s)
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24th March 2020, 21:34Everything is relative..... If your chassis is ground and your reference is ground, there is no antenna effect. Brian.11 replies | 529 view(s)
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23rd March 2020, 22:41betwixt replied to a thread Why On startup LED1(connceted at GPIO-0) ONCE gets blink at ESP-01 module in Elementary Electronic QuestionsOK, here are the results: On the module I checked, which has been programmed with my own code but this is at power-up and before it runs: IO0...9 replies | 1017 view(s)
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23rd March 2020, 00:39betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsThe schematics do make sense but as you point out, they are devoid of actual values. Treat them as conceptual, they show how it works without...59 replies | 2106 view(s)
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23rd March 2020, 00:19betwixt replied to a thread Why On startup LED1(connceted at GPIO-0) ONCE gets blink at ESP-01 module in Elementary Electronic QuestionsI haven't checked but it is also possible the pin carries a short burst of serial information. When the ESP8266 powers up it sends a list of...9 replies | 1017 view(s)
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23rd March 2020, 00:10betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsThe who concept from the first post is rather odd and it gets worse when you start adding zero crossing optocouplers, triacs and MOSFETS. As with...59 replies | 2106 view(s)
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22nd March 2020, 21:36betwixt replied to a thread thought experiment to understand measuring equipment. in Power ElectronicsI have this picture in my mind of 40,000 'D' batteries in series and a poor little 0603 SMD resistor...... Brian.18 replies | 734 view(s)
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