betwixt
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Yesterday, 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 | 1863 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 | 1863 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...1 replies | 124 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 | 1863 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 | 467 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 | 1863 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 | 189 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 | 189 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...18 replies | 522 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 | 1863 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 | 1863 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 | 463 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 | 1863 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 | 463 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 | 463 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 | 986 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 | 1863 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 | 986 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 | 1863 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 | 660 view(s)
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20th March 2020, 23:26betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsIf that was a real circuit the optocoupler would be embedded in the ceiling by now. However, the problem is the gate voltage has to be relative to...59 replies | 1863 view(s)
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20th March 2020, 00:43You kidding! - look at this: https://www.youtube.com/watch?v=6BBx8BwLhqg It's bad enough that it rearranges your molecular spin, I think a magnet...15 replies | 674 view(s)
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19th March 2020, 23:17betwixt replied to a thread capacitive touch sense switch in PCB Routing Schematic Layout software and SimulationThey don't normally work by sensing stray fields because it would fail on battery powered equipment or anywhere electrically quiet. The principle...7 replies | 519 view(s)
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19th March 2020, 23:08betwixt replied to a thread Where to get schematics about SCRs full-wave triggering circuits ? in Power ElectronicsJust for interest, I had to repair a dead UV water sterilizer unit recently and had to trace it's schematic from the PCB. It used a diac in a...59 replies | 1863 view(s)
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19th March 2020, 22:56Thanks for your good wishes Kostas. I was diagnosed just over a year ago but this last trip was for biopsy to see how far it has spread. Too many...15 replies | 674 view(s)
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19th March 2020, 22:47betwixt replied to a thread Why On startup LED1(connceted at GPIO-0) ONCE gets blink at ESP-01 module in Elementary Electronic QuestionsFor the first 50mS or so after power is applied, the IO0 pin is used by the internal bootloader to see if it should enter programming mode or normal...9 replies | 986 view(s)
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19th March 2020, 20:37I really wish it was Covid19! It's cancer I'm afraid. Actually I was quite lucky, the hospital stopped all admissions the day after I left so it...15 replies | 674 view(s)
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19th March 2020, 14:13Sorry for my misinformation about being RX only. I've been hospitalized for a while with only my mobile phone so reading Yaesu schematics hasn't been...15 replies | 674 view(s)
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19th March 2020, 10:37betwixt replied to a thread NE5534 quad version? in Analog Integrated Circuit (IC) Design, Layout and FabricationI agree with Prairiedog regarding the output stage. The data sheet for the LM383 specifically adds a resistor in the output 'Zobel' network to...8 replies | 501 view(s)
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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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