betwixt
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Yesterday, 23:16betwixt replied to a thread Help to build my auto disconnecting circuit. in Hobby Circuits and Small Projects ProblemsFor WiFi or Bluetooth control from a mobile phone there is no practical alternative to commercial modules. They are both very complex systems that...9 replies | 265 view(s)
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Yesterday, 09:38betwixt replied to a thread Help to build my auto disconnecting circuit. in Hobby Circuits and Small Projects ProblemsA simple relay and delay circuit will cut the power either by direct switching or by a relay. If you want to set the delay by WiFi it gets much more...9 replies | 265 view(s)
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Yesterday, 09:22How do series connected buffers increase the output capability? Brian.6 replies | 203 view(s)
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10th November 2019, 14:33betwixt replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsUnbalanced switching just creates distortion in the waveform and a DC offset toward the voltage you are not pulling down. In most cases it would be...19 replies | 539 view(s)
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10th November 2019, 10:22betwixt replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power Electronics"Burst firing" in this context is no different to mechanical thermostats but operating a bit faster. The alternative is phase control as in...19 replies | 539 view(s)
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9th November 2019, 21:58betwixt replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsBoth are bad, especially the one in post #6. By alternating the half cycles you are creating a 25Hz (I think the fundamental is 50Hz in your...19 replies | 539 view(s)
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9th November 2019, 15:53betwixt replied to a thread Regulating temperature of mains connected heating element: Skipping mains half cycles in Power ElectronicsAlways try to draw equal current from each polarity of cycles so the average over a short length of time is always zero. If you draw half cycles,...19 replies | 539 view(s)
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8th November 2019, 14:45betwixt replied to a thread "RS-232 port to transfer data to PC for analysis" in Software Problems, Hints and ReviewsAs Klaus stated, RS232 is a voltage level definition for serial communications, it has nothing to do with UARTs although in most cases one is...6 replies | 304 view(s)
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8th November 2019, 10:10I think they are asking for an equivalent PCB that has the 5V PSU on it as well. Basically a stand-alone AC powered WiFi relay. Brian.5 replies | 372 view(s)
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7th November 2019, 16:58betwixt replied to a thread public hex to asm possible to get in Software Problems, Hints and ReviewsHaven't used Windows or the old MPLAB for many years but the error suggests you didn't add the source files to the project properly. Brian.26 replies | 1246 view(s)
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7th November 2019, 10:44betwixt replied to a thread Advice please making PCBs using Press n Peel film in Hobby Circuits and Small Projects ProblemsI doubt the problem is the cleanliness of the PCB, more likely the film has 'dried out' (aged) and lost some adhesion or the temperature is wrong. ...6 replies | 504 view(s)
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7th November 2019, 10:10I haven't checked the transistor data sheet to be sure but isn't the tab normally the collector connection on TO-220 RF power transistors. If it is,...12 replies | 359 view(s)
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6th November 2019, 13:54You are confusing the electronic level and the filing system levels. There are only two electronic operations, read bits and write bits, they apply...10 replies | 429 view(s)
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6th November 2019, 12:37That is usually dealt with by the operating system but is also depends on the way the SD card is formatted. Deleting a file generally means looking...10 replies | 429 view(s)
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6th November 2019, 11:30betwixt replied to a thread Advice please making PCBs using Press n Peel film in Hobby Circuits and Small Projects ProblemsI normally buy prepared boards with the resist paint already on them. On a few occasions the production has been aborted due to last minute design...6 replies | 504 view(s)
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6th November 2019, 11:18Not on the SD card, on the socket it plugs in to! Brian.10 replies | 429 view(s)
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5th November 2019, 16:10Most importantly, does it recover by itself? Is this a fault that only happens occasionally then continues to work afterwards or does it cease to...7 replies | 307 view(s)
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5th November 2019, 12:16Half the World uses 60Hz and some places use DC. All are compromises, lower frequency means generators in power stations turn slower and so last...9 replies | 337 view(s)
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5th November 2019, 10:29betwixt replied to a thread Advice please making PCBs using Press n Peel film in Hobby Circuits and Small Projects ProblemsI have tried test boards using that method and never got anything good from it. If you invest in a UV exposure box and some chemicals you will get...6 replies | 504 view(s)
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4th November 2019, 20:12betwixt replied to a thread high side PWM switching, to control LEDs separately in Elementary Electronic QuestionsIt should work but it might be easier to do it the other way around, drive all the low side transistors with the PWM but gate their drive signal with...4 replies | 265 view(s)
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4th November 2019, 20:06betwixt replied to a thread Can ULN2003 drive two 6~9V DC motors? in Elementary Electronic QuestionsAside from the limit FvM mentions, that device cannot 'drive' anything. It is a current sink only but you can use it in the negative side of your...2 replies | 185 view(s)
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4th November 2019, 11:13betwixt replied to a thread public hex to asm possible to get in Software Problems, Hints and ReviewsAn asm file is plain text so use any text editor you wish. The problem is not the type of file, it is how to recognize what is inside it. When...26 replies | 1246 view(s)
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3rd November 2019, 23:24betwixt replied to a thread public hex to asm possible to get in Software Problems, Hints and ReviewsI would be very surprised if the text was directly readable. Look for the ASCII codes of the original text to locate it. You can then substitute the...26 replies | 1246 view(s)
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3rd November 2019, 17:55betwixt replied to a thread How to estimate the actual distance of the object in image? in Digital Signal ProcessingThe camera appears to be directly over the center line and presumably you know the horizontal and vertical scale (or use distace between the other...3 replies | 231 view(s)
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2nd November 2019, 00:34betwixt replied to a thread Automatic light control circuit (On-Off) in Hobby Circuits and Small Projects ProblemsBetter, but it has some problems. It works from a DC 12V supply so it won't directly operate your lamp. You could change LED1 for a relay coil and...11 replies | 684 view(s)
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1st November 2019, 21:11betwixt replied to a thread public hex to asm possible to get in Software Problems, Hints and ReviewsI'm sorry but I am away on vacation at the moment using a mobile phone and it can't open .rar files. In theory, if you disassemble a file it...26 replies | 1246 view(s)
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1st November 2019, 12:17betwixt replied to a thread Automatic light control circuit (On-Off) in Hobby Circuits and Small Projects ProblemsThe transistors should be NPN. The circuit should work but it still has soft operating point. The relay current is depedent on the light level,...11 replies | 684 view(s)
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1st November 2019, 09:42Remember electric fencing is normally used to deter farm animals from straying outside a perimeter, they are not for stopping thieves. Most use...4 replies | 242 view(s)
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1st November 2019, 09:27You have it wired correctly. I see no problems. Brian.2 replies | 169 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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