betwixt
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Yesterday, 15:28betwixt replied to a thread Is there a safe way to fix this scratch on the hot side of PSU? in Power ElectronicsDell PSUs are no better or worse than every other make. Top picture: not much you can do to restore the original copper, I think I would run a...3 replies | 83 view(s)
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Yesterday, 15:18HardwareChap - can you give us more information please. Are the two coils part of a single inductor (magnetically coupled) or are they independent...3 replies | 73 view(s)
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Yesterday, 11:22betwixt replied to a thread MCPCB which is double sided and with plated through vias in Power ElectronicsAgreed - and what are the 'J' references to? Brian.8 replies | 147 view(s)
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Yesterday, 11:151. remove R4 and R6 they serve no purpose, link the PIC directly to the '164. 2. read the HC164 data sheet, the input is clocked on the low to high...2 replies | 55 view(s)
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Yesterday, 11:01Circuit A will only work when the diodes are Zener types. Remember a Zener works like a normal diode in forward direction so the clamp voltage is...3 replies | 73 view(s)
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Yesterday, 09:41betwixt replied to a thread "IR based" relay driving problem in Hobby Circuits and Small Projects ProblemsNice idea but I doubt it will ever work. LDRs are sensitive to a far wider spectrum of light than you want and are also slow to react. A simple...6 replies | 125 view(s)
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15th January 2019, 22:39I'm not laughing - honest. If kavin_eees will allow an analog solution it is very simple: add a series resistor to the whole feed to all the LEDs....4 replies | 149 view(s)
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15th January 2019, 16:44I agree a NE555 would struggle to produce timing as long as that but the CMOS version might be able to. The timing would be very imprecise and...9 replies | 170 view(s)
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15th January 2019, 16:34The LED logic is: 1. switch open, LED has no voltage across it, 2. switch closed, 10mA bypasses the LED so there may not be enough current. ...8 replies | 164 view(s)
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15th January 2019, 16:25A further question: Do you want to do this using logic or an analog solution. If all the LEDs draw the same current there is a very simple way to...4 replies | 149 view(s)
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15th January 2019, 10:44Only showing my age on the outside - I'm still a teenager inside :-D Brian.7 replies | 398 view(s)
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15th January 2019, 10:39betwixt replied to a thread 230Vac pump drive with a microprocessor in Elementary Electronic QuestionsR44 isn't necessary and R3 may need a slightly lower value but otherwise it should work. Note that it may be advisable to add a snubber (33 Ohms and...1 replies | 80 view(s)
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15th January 2019, 10:26betwixt replied to a thread MCPCB which is double sided and with plated through vias in Power ElectronicsSo you propose something like the bottom image but made from two of the top image back-to-back with your own plastic insulator. Sounds...8 replies | 147 view(s)
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14th January 2019, 22:43... I think that was just to detect zero crossing. However, using PIC PWM module usually implies a relatively fast PWM rate so unless this is a...10 replies | 311 view(s)
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14th January 2019, 22:38betwixt replied to a thread MCPCB which is double sided and with plated through vias in Power ElectronicsQuestion: are you using double sided MCPCB (assuming that having a core means there is layer each side of it) or are you proposing two single sided...8 replies | 147 view(s)
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14th January 2019, 15:07Typically, the pyro detector produces a small signal that is amplified and filtered by one or more op-amp stages then fed to a comparator. There will...6 replies | 159 view(s)
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13th January 2019, 16:44betwixt replied to a thread Common mode noise and earth connections in offline SMPS in Power ElectronicsThe situation is similar to your crystal set thread where it is aptly described as like a one handed clap. A noise generator has to be between two...4 replies | 183 view(s)
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13th January 2019, 16:21Could do with a clue here - is 'ENABLE' an input to this circuit or an output from it? Are you perhaps trying to gate the signal on RC0 so it only...17 replies | 415 view(s)
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13th January 2019, 16:13I'm pretty sure I've got some NE-2 here in my box of ever ageing junk. Yes, I do remember them in counters and I think there was a commercial...7 replies | 398 view(s)
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13th January 2019, 12:36Klaus, CCP1 is one of the capture or PWM output pins depending on configuration. In PWM mode it is an output, in CCP mode it effectively becomes a...10 replies | 311 view(s)
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12th January 2019, 20:36betwixt replied to a thread Common mode noise and earth connections in offline SMPS in Power ElectronicsI think that would be the preferred way. However, you have to think of the unit as a whole, it may generate noise but how does it get out. If you...4 replies | 183 view(s)
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12th January 2019, 20:30betwixt replied to a thread TO247 FET mounted in "SMD" fashion and pressurized against heatsink with "foam" in Thermal ManagementI disagree with both of you! It should be thermally insulating since it is only intended to put pressure against the tab, if it was conductive, and...6 replies | 340 view(s)
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12th January 2019, 20:23betwixt replied to a thread "Crystal set" radio works only when connected to earth in Elementary Electronic QuestionsThink of the circuit as a 'floating' receiver, it doesn't care where it's signal comes from as long as it's there. What you did was attach an antenna...5 replies | 218 view(s)
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12th January 2019, 10:33The same applies to all PICs, the pins can be inputs, outputs or tri-stated. If you are using any as an output and drive it high or low, it will have...18 replies | 732 view(s)
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11th January 2019, 23:04... but beware that if you tri-state the pin (TRISx register) it is disconnected from the driver circuit inside the PIC so it will no longer pull the...18 replies | 732 view(s)
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11th January 2019, 22:58Somewhat reminds me of a 'beeper' I can across a few months ago. It was a tone at about 1KHz pulsing at about 2Hz rate with apparently no active...7 replies | 398 view(s)
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10th January 2019, 21:05Not quite. The voltage is brought within the range of the microcontroller by the potential divider R6/R8 and R7/R9, the amplifier is configured as a...4 replies | 454 view(s)
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10th January 2019, 17:48Checksums are as reliable as there are combinations of bits in them. The real answer depends on what the serial data contains and whether you can...3 replies | 147 view(s)
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10th January 2019, 12:27betwixt replied to a thread Mosquito Zapper - Different approaches, and circuit diagrams... in Analog Circuit DesignAC and DC ratings are not quite the same thing but for low frequencies if you multiply the AC rating by 1.414 (square root of 2) it will give a...6 replies | 268 view(s)
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