betwixt
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Yesterday, 22:12betwixt replied to a thread NodeMCU sinking current through DIO while power is off in Analog Circuit DesignThe voltage ratings and polarity limitations are from the DIO pins (and others) to the ground pin. Ask yourself what voltage will there be between...3 replies | 132 view(s)
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Yesterday, 19:24betwixt replied to a thread NodeMCU sinking current through DIO while power is off in Analog Circuit DesignI'm hardly surprised, disconnecting the ground will almost certainly violate the maximum voltage and polarity ratings of the nodeMCU. Consider that...3 replies | 132 view(s)
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Yesterday, 16:51Cleaning the board AND the keypad mat is needed. I doubt the electronics is damaged. Take the floppy plastic keypad mat and wash it in warm (not...4 replies | 115 view(s)
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Yesterday, 13:24betwixt replied to a thread Problem with Logitech Audio PCB (No Sound Output) in Hobby Circuits and Small Projects ProblemsIt might but it won't work as well and you risk it being damaged or even exploding. You can generally increase the value and working voltages but you...24 replies | 1054 view(s)
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Yesterday, 08:47betwixt replied to a thread Why does my homemade Yagi wifi antenna perform so poorly? in RF, Microwave, Antennas and OpticsWhere is the folded dipole? The ends of the feeder cable need tidying up (they are part of the dipole) but they should go to the ends of the folded...12 replies | 280 view(s)
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Yesterday, 08:38betwixt replied to a thread interfacing IR remote using NEC protocol - mikroc for PIC in MicrocontrollersWow! That's a fast PIC! I think hexreader was referring to the PIC clock frequency not your PC. Brian.12 replies | 246 view(s)
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15th August 2019, 23:04From the schematic it looks like you don't need a potentiometer at all, just a variable voltage. The "CVS MAX TRIM" and "CVI MIN TRIM" circuits...11 replies | 364 view(s)
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15th August 2019, 21:30betwixt replied to a thread Problem with Logitech Audio PCB (No Sound Output) in Hobby Circuits and Small Projects ProblemsThe top picture looks correct to me, assuming the number refer to the actual pin numbers on the IC. Be aware that reversing the IC will probably...24 replies | 1054 view(s)
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15th August 2019, 11:20The problem is clearly in line 234, near the function for grinding smoke. If you want a sensible answer you will have to give us more information,...2 replies | 83 view(s)
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15th August 2019, 08:35betwixt replied to a thread To set two WiFi module(Esp8266) one as sender and other as reciever. in MicrocontrollersSearch for "ESP8266 modem" for clues. Brian.1 replies | 101 view(s)
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14th August 2019, 21:57ANY application can use embedded Linux, not just the ones you mentioned. It is popular because it is free and open source, that means you can modify...2 replies | 147 view(s)
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14th August 2019, 18:36As far as I know the enc28j60 just compares whatever IP you tell it with the data stream. I don't think it is aware of what the numbers actually mean...2 replies | 121 view(s)
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14th August 2019, 16:55I agree with Barry, you need to give us a little more information. How many keys do you need, to some extent that decides the kind of keypad you...2 replies | 126 view(s)
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14th August 2019, 08:45Maybe not a good idea to share the same crystal between two ICs, try disconnecting the OSC output from U6 or you have two conflicting outputs...3 replies | 127 view(s)
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13th August 2019, 22:26It will work but the limitations of the components, particularly the potentiometer will seriously degrade it as the frequency increases. The...6 replies | 291 view(s)
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13th August 2019, 14:58Like most diodes, LEDs are constant voltage devices. That means the voltage across them remains fairly steady as the current through them changes....9 replies | 234 view(s)
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12th August 2019, 13:48betwixt replied to a thread How to drive vending Machine motor through MOSFET Driver Module? in Power ElectronicsOK, so the motor has TWO connections, not six and the 'relay' is actually a switch is presumably driven by the mechanism. What we don't know is how...9 replies | 289 view(s)
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11th August 2019, 16:58Search for "synchroscope" for ideas. Note that they synchronize one source so it matches another before connecting them. Your discussion should...35 replies | 1846 view(s)
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11th August 2019, 12:03How about: "Methods to synchronize AC power sources so they can be interconnected in a grid" The problem you are trying to solve is how to bring...35 replies | 1846 view(s)
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11th August 2019, 10:07betwixt replied to a thread Whats the best way to ESD damage a PCB in Elementary Electronic QuestionsThe answer depends on the ESD you want to use. A human static discharge model is quite simple and well documented. If you are trying to quantify...6 replies | 270 view(s)
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11th August 2019, 09:53betwixt replied to a thread Strategy for a multi signal generator using a MAX10 in PLD, SPLD, GAL, CPLD, FPGA DesignAs this is the first post in a new thread it would be useful to know which other post you are referring to. Brian.10 replies | 395 view(s)
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11th August 2019, 08:41This should really be a new thread as the topic has changed but here is my suggestion: Grid power comes from power stations that use nuclear,...35 replies | 1846 view(s)
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11th August 2019, 00:03betwixt replied to a thread Using TL431/OPTO feedback with LNK304 based HV Buck in Power ElectronicsTry it. I can't see any reason it shouldn't work but do be aware of the combined gain of the switcher and TL431 causing stability problems. I think...1 replies | 134 view(s)
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10th August 2019, 17:08betwixt replied to a thread [SOLVED] What the best driver for controlling SSRs using a 5v uC in Power ElectronicsThat is correct. Double check the SSR has an internal series resistor to limit the current as described by FvM. Almost all of them do. Brian.5 replies | 177 view(s)
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10th August 2019, 14:30Np precautions are necessary except for possibly radiating interference. The impedance of the 'coil' will be the load rather than its pure...35 replies | 1451 view(s)
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10th August 2019, 14:26betwixt replied to a thread [SOLVED] What the best driver for controlling SSRs using a 5v uC in Power ElectronicsTwo transistors, NPN is probably easiest with the SSR in the collector. Brian.5 replies | 177 view(s)
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10th August 2019, 08:44betwixt replied to a thread Sine PWM calculated with pic, instead of using table in MicrocontrollersEasier to store the sine table in program memory than EEPROM. I don't know PicBasic but the equivalent in 'C' of making it a 'const' table. I doubt...13 replies | 519 view(s)
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10th August 2019, 08:36Something is wrong there. I assume the top 'scope trace is gate to SOURCE not drain. Can you show a photograph of the construction please, all I...35 replies | 1451 view(s)
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9th August 2019, 21:28betwixt replied to a thread Error in Parity bits of Hamming Code in PLD, SPLD, GAL, CPLD, FPGA DesignThe parity bits are included in the check as it moves along the bits. If you mean your original data also has a parity bit, for example in some...19 replies | 483 view(s)
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9th August 2019, 20:19betwixt replied to a thread How to drive vending Machine motor through MOSFET Driver Module? in Power ElectronicsYour photograph only shows two connections to the motor, the red wire and the black wire. It isn't clear what the other connections are but I...9 replies | 289 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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