betwixt
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Yesterday, 08:17You can't exactly simulate a hardware reset because the reason for the last reset is held in one of the registers and set at the time it happens....12 replies | 238 view(s)
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24th April 2019, 23:29betwixt replied to a thread MAINS transfer relat circuit: does this look safe and reliable? in Power ElectronicsIf the relay contacts are sufficiently rated there is no reason why an AC relay can't be used. I am a little suspicious of the relay in the...4 replies | 140 view(s)
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24th April 2019, 21:38betwixt replied to a thread Wish to repair Tenma 72-8155 capactiance meter in Service Manuals, Requests, Repair TipsI would think it highly unlikely that significant charge would still exist after several days, especially in-circuit, more likely it 'just' broke and...2 replies | 67 view(s)
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24th April 2019, 14:07betwixt replied to a thread Can I use a digital potentiometer replace the potentiometer in a buck converter board in Professional Hardware and Electronics DesignIt would be difficult to replace the potentiometer with a digital one in that schematic because of the high voltages it would have to endure. You...4 replies | 194 view(s)
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24th April 2019, 13:59A UART is a specific device within most microcontrollers, you need to consult the data sheet to see how to use it. If you want to use any other pin...3 replies | 126 view(s)
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24th April 2019, 13:16You can use any pin of a microcontroller to read or send serial data if you program it appropriately. If the microcontroller has a UART module it is...3 replies | 126 view(s)
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24th April 2019, 12:01Not in the 16F877A. Most modern PICs have an option to internally connect MCLR to VDD so the pin is released for other uses but the venerable 877A...12 replies | 238 view(s)
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24th April 2019, 11:57betwixt replied to a thread LM741 Bass/Treble & Volume Control in Hobby Circuits and Small Projects ProblemsYes, you need to hold the non-inverting input at about half supply voltage for it to work. Grounding it will stop it working. As the DC level is...15 replies | 1250 view(s)
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24th April 2019, 11:53betwixt replied to a thread Arduino to Arduino using Serial through MAX232 in Hobby Circuits and Small Projects ProblemsI'm with Klaus on this, twisting the wires alone will serve no purpose and twisting RS232 signals will make things worse. RS232 also requires a...2 replies | 105 view(s)
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24th April 2019, 11:40betwixt replied to a thread Multiple ADC inputs connected together in Professional Hardware and Electronics DesignPerhaps one or both of the pins have dual purpose and is used in digital mode. Taking two identical measurements makes no sense and the extra load...4 replies | 143 view(s)
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24th April 2019, 08:27betwixt replied to a thread Trying to repair a Bosch JS470E jigsaw - component ID? in Service Manuals, Requests, Repair TipsI would agree with Brad that it sounds a bit more serious than a broken inductor. However, answering your original question, it does appear to be...7 replies | 199 view(s)
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23rd April 2019, 14:01betwixt replied to a thread Trying to repair a Bosch JS470E jigsaw - component ID? in Service Manuals, Requests, Repair TipsLooks like a 4.7mH inductor but why it is mounted on a second board is a mystery unless it is to sense the magnetic field from the motor. When it is...7 replies | 199 view(s)
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23rd April 2019, 13:56betwixt replied to a thread [moved] How to design a crystall oscilator circuit using CMOS 40106 DESIGN in Hobby Circuits and Small Projects ProblemsThe capacitor values come from the crystal manufacturers data sheet, if you use 33pF or 39pF it should work fine, the values are not particularly...7 replies | 342 view(s)
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22nd April 2019, 15:38betwixt replied to a thread First 555 timer circuit, bunch of questions using a relay in Hobby Circuits and Small Projects ProblemsIn a way you are right but the risk is that your connection isn't to ground first then the trigger pin second. If you touch trigger first you...12 replies | 1295 view(s)
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22nd April 2019, 13:19The symptoms still suggest the problem is due to signal strength. If the USB link was faulty you would not see the correct characters at all. It...14 replies | 947 view(s)
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22nd April 2019, 09:15betwixt replied to a thread First 555 timer circuit, bunch of questions using a relay in Hobby Circuits and Small Projects ProblemsBear in mind that floating inputs also present a risk of damage. In simple terms, that static charge you used to trigger the timer could be big...12 replies | 1295 view(s)
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21st April 2019, 21:35betwixt replied to a thread First 555 timer circuit, bunch of questions using a relay in Hobby Circuits and Small Projects ProblemsCapacitive touch sensors work on a different principle and would be very difficult to implement with simple 555 timers. What you saw was the trigger...12 replies | 1295 view(s)
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21st April 2019, 21:16betwixt replied to a thread Ethernet(ENC28J60) Interfaced Arduino - DHCP Failed in Elementary Electronic QuestionsI can't see why the CPU should be overloaded and I suspect it is a limitation of Proteus. I do not use Windows so I cannot use Proteus to check...4 replies | 271 view(s)
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21st April 2019, 16:18betwixt replied to a thread Ethernet(ENC28J60) Interfaced Arduino - DHCP Failed in Elementary Electronic QuestionsSimulations are often wrong! Did you change the line:as advised in the program? also check your MAC isn't blacklisted by your router. Brian.4 replies | 271 view(s)
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21st April 2019, 12:28See if XON/XOFF protocol is supported. It drops special commands for 'stop' and 'start' into the data stream itself so you don't have to rely on...13 replies | 1421 view(s)
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21st April 2019, 12:25Those messages are telling about the connection state to the network. They are saying it is intermittently able to connect, which implies a weak or...14 replies | 947 view(s)
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21st April 2019, 10:31betwixt replied to a thread First 555 timer circuit, bunch of questions using a relay in Hobby Circuits and Small Projects ProblemsI seriously do NOT recommend leaving the trigger pin floating. It worked when you touched it because your body held enough static charge that it...12 replies | 1295 view(s)
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21st April 2019, 08:43betwixt replied to a thread First 555 timer circuit, bunch of questions using a relay in Hobby Circuits and Small Projects Problems1. The circuit will probably drain your car battery in about 1 year if you don't recharge it. So don't worry about current consumption, the relay is...12 replies | 1295 view(s)
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20th April 2019, 11:47What GSM module? What TTL to USB converter? The message suggests you have a poor GSM signal, the different messages say it is having trouble...14 replies | 947 view(s)
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20th April 2019, 08:07Even 2400 Bauds (= symbol rate rather than bit rate) might be difficult to achieve over a normal phone line. The reason is simple, there are only two...13 replies | 1421 view(s)
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19th April 2019, 11:31I'm no expert in Atmega devices but the schematic suggests it generates the negative voltage needed for serial communication comes from a charge pump...16 replies | 666 view(s)
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18th April 2019, 19:34.... or more accurately DecTemp = (float)AdcValue * 0.0001; It shouldn't have crashed though. Maybe something that has been fixed since MPLABX...6 replies | 709 view(s)
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18th April 2019, 14:41The compiler should never produce duplicate addresses in its hex file. It would imply the linker had failed and at the very least should abort with...14 replies | 883 view(s)
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18th April 2019, 14:32betwixt replied to a thread Fuse replacement 110V 5A to replace 220V 5A ? in Service Manuals, Requests, Repair TipsBungees aside - when a fuse breaks it is because the current through it exceeded its rating. The current causes heating in the fuse wire regardless...5 replies | 490 view(s)
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18th April 2019, 11:40betwixt replied to a thread How to read incremental rotary (quadrature) encoder? in MicrocontrollersI agree with Klaus, you would need significant extra electronics to externally multiplex SW with the encoder output and for such a low priority...7 replies | 260 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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