betwixt
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Today, 16:35betwixt replied to a thread 4x4 Keypad for Arduino with color keys and braille texture (no membrane buttons) in Elementary Electronic QuestionsMaking your own keypad is fairly easy and you can buy Braille keypad stickers from Amazon and others. You could consider these:...1 replies | 44 view(s)
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Today, 09:18Look at this link: https://www.electroschematics.com/9730/high-power-led-dimmer/ It is for high power LEDs but it will work just as well with a...5 replies | 192 view(s)
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Today, 08:23betwixt replied to a thread Sine PWM calculated with pic, instead of using table in MicrocontrollersThat seems a far better solution. There is an error in your table at 199 but that may be because of text formatting on Edaboard, I see a gap between...22 replies | 733 view(s)
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Yesterday, 21:12The scope traces look suspicious to me. Given that the scope, probe and stray capacitance is effectively the load after 100M of resistance, I would...20 replies | 402 view(s)
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Yesterday, 16:19betwixt replied to a thread Sine PWM calculated with pic, instead of using table in MicrocontrollersRemember that you can't produce two different PWM signals simultaneously with only one PWM generator but if one of the signals is the inverse of the...22 replies | 733 view(s)
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Yesterday, 10:59betwixt replied to a thread Sine PWM calculated with pic, instead of using table in MicrocontrollersI think it will work but the waveform will be quite distorted. I do not use BASIC at all but I would guess the PULSOUT command uses a software loop...22 replies | 733 view(s)
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Yesterday, 09:29The phase shift in your original post depends on the reactance of the capacitor so it varies with frequency. If you manage to find suitable values...10 replies | 444 view(s)
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Yesterday, 09:22Are you compensating the probe alone or with the HV divider resistors attached? You need to apply the square wave through the divider then do the...20 replies | 402 view(s)
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17th August 2019, 20:57What exactly is driving them, the waveform suggests it is a single pulse and the transformer is 'ringing'. Are the tabs mounted on a a heatsink? I...20 replies | 402 view(s)
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16th August 2019, 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...4 replies | 232 view(s)
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16th August 2019, 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...4 replies | 232 view(s)
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16th August 2019, 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 | 157 view(s)
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16th August 2019, 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 | 1212 view(s)
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16th August 2019, 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...17 replies | 542 view(s)
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16th August 2019, 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.13 replies | 374 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 | 412 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 | 1212 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 | 116 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 | 130 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 | 177 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 | 146 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...4 replies | 174 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 | 144 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...10 replies | 444 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 | 277 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 | 334 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 | 1888 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 | 1888 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 | 301 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 | 449 view(s)
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PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
It's better to share your questions and answers on Edaboard so we can all benefit from each others experiences.
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