betwixt
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Today, 15:14betwixt replied to a thread How does one learn to read a schematic? (Marshall tube guitar amp) in Tubes and RetroReading a schematic of any type involves recognizing what the component configuration is. In analog circuits, tube or transistor, there are only...3 replies | 104 view(s)
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Yesterday, 20:52betwixt replied to a thread Problem with Logitech Audio PCB (No Sound Output) in Hobby Circuits and Small Projects ProblemsCan you plug the loudspeaker jack into something else to try them? I'm trying to confirm the fault is electronic and not just a faulty loudspeaker,...34 replies | 1598 view(s)
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Yesterday, 17:29betwixt replied to a thread 450w ATX smps switching voltage low in Service Manuals, Requests, Repair TipsThey are not the manufacturer, it's just the name they put on it that day. The next day it would have a different branding. That way nobody can go...6 replies | 229 view(s)
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22nd August 2019, 20:05betwixt replied to a thread Problem with Logitech Audio PCB (No Sound Output) in Hobby Circuits and Small Projects ProblemsI agree the voltages look slightly out on IC#2 but they are at least all shifted by the same amount. The photographs clearly show the grounds are...34 replies | 1598 view(s)
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22nd August 2019, 08:23betwixt replied to a thread Problem with Logitech Audio PCB (No Sound Output) in Hobby Circuits and Small Projects ProblemsThe slight differences are nothing to worry about. If one channel works and the other doesn't but the voltages are almost the same, it suggests...34 replies | 1598 view(s)
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21st August 2019, 12:46I don't think this is a reset signal timing or power supply problem. By paralleling two oscillator circuits you run the risk of them randomly not...8 replies | 323 view(s)
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21st August 2019, 12:44betwixt replied to a thread Splitting plane for negative power supply in PCB Routing Schematic Layout software and SimulationIt is entirely your choice. Using internal layers for power and ground is not absolutely essential, it is done for convenience as those nodes...2 replies | 149 view(s)
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21st August 2019, 09:46betwixt replied to a thread cd4060 used in sensor circuit in Hobby Circuits and Small Projects ProblemsI agree, but to describe it as a TDS meter is somewhat misleading, for example the domestic water here has little conductivity but extremely high...3 replies | 232 view(s)
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21st August 2019, 09:29That's very bright (and hot) for a microscope. I use a low power LED. Why do you need it to be so bright? Brian.15 replies | 445 view(s)
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20th August 2019, 15:31betwixt replied to a thread cd4060 used in sensor circuit in Hobby Circuits and Small Projects ProblemsNo idea. But I can tell you that you can't measure TDS with an electrical probe. It has to be done optically and I don't see any source or detector...3 replies | 232 view(s)
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20th August 2019, 13:19betwixt replied to a thread LTC 4367 Transistor burning Issues in Hobby Circuits and Small Projects ProblemsApologies, your original schematic shows an unconnected source at pin 9 but I see from the data sheet it is an 8-pin device with internally connected...4 replies | 176 view(s)
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20th August 2019, 13:12Your finger falls off? Seriously, there must be 10,000 different designs of SMPS doing 10,000 different tasks, how do you expect us to answer a...1 replies | 118 view(s)
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20th August 2019, 10:08The actual sensor device in a PIR module normally has two different sensors side-by-side inside it, so that they do not detect background IR, which...4 replies | 220 view(s)
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20th August 2019, 09:20I don't know of any such device but most PIR sensors are mounted in 'zoned' lenses anyway. They work by comparing the IR in adjacent zones (A B A B A...4 replies | 220 view(s)
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20th August 2019, 09:15I have no experience of this but I would guess it would be difficult to establish an arc with a power limited source. If my thinking is right, it...22 replies | 521 view(s)
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20th August 2019, 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...4 replies | 176 view(s)
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19th August 2019, 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 | 204 view(s)
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19th August 2019, 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 | 129 view(s)
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19th August 2019, 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...15 replies | 445 view(s)
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19th August 2019, 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 | 925 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...26 replies | 680 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 | 925 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 | 925 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 | 562 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...26 replies | 680 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...26 replies | 680 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 | 339 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 | 339 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...5 replies | 255 view(s)
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