betwixt
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Today, 15:10I anticipated the voltage drop problem but without a specification for the solenoids it is difficult to see how much it is likely to be. However, to...23 replies | 339 view(s)
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Today, 13:00Depends on the power control circuit, it will work both ways, one will make the comparator output high when more than two solenoids active, swap them...23 replies | 339 view(s)
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Today, 12:31Only one opto if a single triac is needed to cut the supply -or- one relay to do the same thing. The solenoids are turned on by the switches...23 replies | 339 view(s)
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Today, 11:42I'm confused as ever, it gets easier to to confuse me as time goes by..... What do all those triacs do? If my original proposal is followed, the...23 replies | 339 view(s)
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Today, 09:47The usual reason for doing that is to make use of the propagation delay through the inverter but as Klaus stated, if we don't know what the timing...4 replies | 75 view(s)
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Today, 09:41The schematics in post #12 are the method I proposed but there is no need to use a ground side resistor for each switch, they are all in parallel so...23 replies | 339 view(s)
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Today, 09:29The capacitors sound a bit big to me too but the 'finger' effect can be things other than the clock. Are all the peripherals connected when the power...6 replies | 70 view(s)
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Yesterday, 22:39I would remove everything from the ISR except resetting the interrupt bit, capturing the received character to a variable and setting a flag to say...4 replies | 99 view(s)
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Yesterday, 12:05betwixt replied to a thread How can you tell if big quantities of a component will be immediately available? in Elementary Electronic QuestionsAsk the manufacturer or distributor. They all have stock control limits and knowledge of 'end of life' periods. For a specific part that isn't used...3 replies | 176 view(s)
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Yesterday, 11:5624V AC solenoids is a whole different ball game to 1.6V DC LEDS. I can't see any method using the switches alone and it seems all digital...23 replies | 339 view(s)
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16th January 2019, 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...4 replies | 161 view(s)
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16th January 2019, 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 | 106 view(s)
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16th January 2019, 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 | 164 view(s)
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16th January 2019, 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...4 replies | 153 view(s)
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16th January 2019, 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 | 106 view(s)
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16th January 2019, 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 | 143 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....23 replies | 339 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 | 196 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 | 180 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...23 replies | 339 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 | 465 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 | 90 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 | 164 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 | 323 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 | 164 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 | 167 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 | 192 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 | 422 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 | 465 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 | 323 view(s)
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