betwixt
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Today, 09:06betwixt replied to a thread LTC 4367 Transistor burning Issues in Hobby Circuits and Small Projects ProblemsI presume the source connection on Q2 is connected to +50V, it isn't shown in the schematic. Gradual reduction in output suggests something is...1 replies | 23 view(s)
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Yesterday, 22:22betwixt replied to a thread Will I be able to drive LED with attached analog circuit ? in Analog Circuit DesignIt will work but I would use a bipolar transistor in this circuit. My reasoning is that to use the MOSFET as a switch its gate voltage needs raising...3 replies | 133 view(s)
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Yesterday, 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 | 93 view(s)
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Yesterday, 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...6 replies | 230 view(s)
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Yesterday, 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 | 819 view(s)
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18th August 2019, 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...22 replies | 465 view(s)
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18th August 2019, 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 | 819 view(s)
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18th August 2019, 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 | 819 view(s)
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18th August 2019, 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 | 492 view(s)
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18th August 2019, 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...22 replies | 465 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...22 replies | 465 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...5 replies | 270 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...5 replies | 270 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 | 167 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 | 1277 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 | 623 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 | 392 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 | 425 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 | 1277 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 | 124 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 | 135 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 | 182 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 | 152 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 | 202 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...4 replies | 155 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 | 492 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 | 289 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 | 343 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 | 1899 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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