betwixt
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Yesterday, 16:39betwixt replied to a thread Can anyone help me identify this IC? in Service Manuals, Requests, Repair TipsI wouldn't pursue this too far, when a manufacturer doesn't show a logo it usually means it's a custom part for a special job and not sold under a...7 replies | 265 view(s)
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22nd January 2019, 22:25According to fig.3 it holds the restart timer in reset so it probably turns back on again when the reset is released. Page 3 quotes: If in doubt,...2 replies | 96 view(s)
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22nd January 2019, 20:20We would have to see the full code but usually this happens because some variable isn't initialized. A hardware reset and a watchdog reset are not...3 replies | 51 view(s)
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22nd January 2019, 15:25It will work but getting the mS delays accurate is better than fiddling around with the results. I think you are grossly overestimating the error as...19 replies | 544 view(s)
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22nd January 2019, 12:22The drift will be small but you may be able to compensate by changing the value you re-load into TMR1L (and TMR1H if the value overflows). You need...19 replies | 544 view(s)
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22nd January 2019, 10:28betwixt replied to a thread Can anyone help me identify this IC? in Service Manuals, Requests, Repair TipsA good starting place is to tell us what the IC is part of. If it's part of a battery charger for example, we would immediately exclude the...7 replies | 265 view(s)
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20th January 2019, 15:03I would do this a different way - the choice is your of course but by restructuring the code you can make it non-blocking very easily. By...19 replies | 544 view(s)
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20th January 2019, 10:22Basically follow this method: 1. configure the interrupts so one occurs when a character is received. 2. In the ISR, check the USART caused the...12 replies | 442 view(s)
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20th January 2019, 10:12betwixt replied to a thread Why is the European mains voltage so well regulated? in Elementary Electronic QuestionsElectric Mountain (Dinorwig) is the generator I was referring to. Its an amazing feat of engineering and virtually the whole power station is built...11 replies | 534 view(s)
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19th January 2019, 21:45betwixt replied to a thread Why is the European mains voltage so well regulated? in Elementary Electronic QuestionsI would guess it has a lot to do with the interconnects between countries. Electricity supply doesn't stop at borders in Europe so the load is very...11 replies | 534 view(s)
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19th January 2019, 10:15Klaus is right of course but I have used 405x and 4351 (the latched version of 4051) in broadcast applications very successfully. In fact they have...3 replies | 149 view(s)
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19th January 2019, 10:08betwixt replied to a thread MCPCB which is double sided and with plated through vias in Power ElectronicsI'm not sure about that TSSOP/2oz limitation. To be honest I spend little time these days on PCB development but I would have thought soldering such...12 replies | 389 view(s)
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18th January 2019, 20:40Try it and see. Make a text file with a single letter in it and save it. Use a simple text editor, not a word processor because they add extra...3 replies | 143 view(s)
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18th January 2019, 16:08This can be for two reasons: 1. Typically a terminator character is added to the end of text files, 2. Granularity of the filing system. ...3 replies | 143 view(s)
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18th January 2019, 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 | 658 view(s)
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18th January 2019, 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 | 658 view(s)
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18th January 2019, 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 | 658 view(s)
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18th January 2019, 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 | 658 view(s)
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18th January 2019, 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...6 replies | 234 view(s)
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18th January 2019, 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 | 658 view(s)
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18th January 2019, 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...10 replies | 315 view(s)
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17th January 2019, 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...12 replies | 442 view(s)
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17th January 2019, 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 | 301 view(s)
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17th January 2019, 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 | 658 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 | 231 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 | 158 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.12 replies | 389 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 | 247 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 | 158 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 | 219 view(s)
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