betwixt
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Yesterday, 23:25betwixt replied to a thread Rectifier diodes with bypass capīs & gounding speaker basketīs in Hobby Circuits and Small Projects ProblemsReplacing 1N400x with BYV27 series will have ZERO effect in a standard 50Hz/60Hz power supply. If the power supply uses high frequency (SMPSU) it...5 replies | 94 view(s)
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Yesterday, 09:29... but good luck re-writing them to work on an 8051 system! Brian.9 replies | 244 view(s)
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15th November 2019, 16:15They rely heavily on look-up tables. There will be a table for each instruction that tells it whether it is a single byte or multi-byte (or...9 replies | 244 view(s)
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15th November 2019, 16:10betwixt replied to a thread Using Linux on ARM A9 cortecx in Embedded Linux and Real-Time Operating Systems (RTOS)Sounds like VNC is missing altogether, you probably need to install it. Also try "localhost:1" or "localhost:5901" as the connection address. ...2 replies | 143 view(s)
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15th November 2019, 15:38Two potential causes are: 1. if there is any difference in ground potential between the MUX and DAC it will show as an error. 2. If disabled (~E is...3 replies | 173 view(s)
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15th November 2019, 15:31Almost certainly this is a power supply problem. A "bridge" in a power supply usually refers to a "bridge rectifier" but they are extremely reliable...2 replies | 92 view(s)
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14th November 2019, 16:18TMR0IF is a flag (a bit that signifies something happened) in the interrupt register, not the timer itself. The timer runs continuously, counting 0...12 replies | 274 view(s)
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14th November 2019, 14:37The missing link here is you are not utilizing the interrupt at all. The interrupt routine (ISR) is called automatically by the timer module, you...12 replies | 274 view(s)
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14th November 2019, 10:06betwixt replied to a thread Power handling capacity of mobile phones,small satellite subsytem andwind profierl in RF, Microwave, Antennas and OpticsFemto Watts to Mega Watts. Are you talking about uplinks, downlinks, power consumption, power emission, overload capability, ERP or something else?...3 replies | 198 view(s)
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14th November 2019, 10:02We have no idea what is at the other end of the cable! If we assume (that is the best we can do) that the black wire is negative and red wire is...1 replies | 136 view(s)
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13th November 2019, 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...6 replies | 173 view(s)
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13th November 2019, 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...9 replies | 244 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 | 427 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 | 427 view(s)
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11th November 2019, 09:22How do series connected buffers increase the output capability? Brian.7 replies | 318 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 | 644 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 | 644 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 | 644 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 | 644 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...11 replies | 411 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 | 486 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.39 replies | 1785 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 | 541 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 | 421 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 | 473 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 | 473 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 | 541 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 | 473 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 | 340 view(s)
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