betwixt
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Yesterday, 21:47betwixt replied to a thread 12v DC proximity detector for use on truck (2-3 feet range) in Analog Circuit DesignDiscriminating what is about to hit is very difficult but if you can live with just a short range proximity sensor, look for ultrasonic devices. They...4 replies | 69 view(s)
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Yesterday, 15:32The hard way I'm afraid. The codes are quite different, including that one is an 8-bit processor and the other is 16-bit. You need to read the...3 replies | 90 view(s)
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11th November 2019, 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...10 replies | 362 view(s)
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11th November 2019, 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...10 replies | 362 view(s)
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11th November 2019, 09:22How do series connected buffers increase the output capability? Brian.7 replies | 288 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 | 608 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 | 608 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 | 608 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 | 608 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 | 331 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 | 454 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.30 replies | 1511 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 | 524 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 | 408 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 | 460 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 | 460 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 | 524 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 | 460 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 | 329 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 | 366 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 | 524 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 | 279 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 | 193 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...30 replies | 1511 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...30 replies | 1511 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 | 242 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 | 715 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...30 replies | 1511 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 | 715 view(s)
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