betwixt
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Yesterday, 08:27betwixt replied to a thread Need help/tips in fixing my Acer projector. in Service Manuals, Requests, Repair TipsI have no experience with these at all but the symptoms suggest either a power supply fault or something is overloading the power supply. The regular...2 replies | 190 view(s)
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18th October 2019, 09:12The coil is powered directly from the rectified AC so it de-activates as soon as the power fails. We have no idea what voltage comes from your...3 replies | 192 view(s)
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17th October 2019, 20:52The plug type is the choice of whoever designed the unit the battery is connected to, it isn't part of the battery itself. Almost certainly the red...4 replies | 399 view(s)
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17th October 2019, 11:53RS-422 should have high noise immunity already. If you can build yourself, UART->Opto->ADM488 or ADM489 would work and be simple. Keep the opto on...3 replies | 330 view(s)
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17th October 2019, 09:57Connect the relay coil across the input side of the regulator, using a series resistor if the voltage is too high. Then, switch your output using the...3 replies | 192 view(s)
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16th October 2019, 21:50betwixt replied to a thread Mains leaking currents causing problems in my house in Elementary Electronic QuestionsNo, I meant the one in the Belkin device in post #38. I understand your confusion over this, there are factors most people wouldn't think twice...46 replies | 2395 view(s)
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16th October 2019, 10:59Q4 is needed if there are two fans in series. The circuit will try to maintain the center at ~15V but the dissipation would be a problem, especially...20 replies | 768 view(s)
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16th October 2019, 10:56If the frequency is fixed, and you are using logic levels which are precise, you can get 90 degrees shift with one resistor and one capacitor. Just...11 replies | 506 view(s)
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16th October 2019, 09:20You are missing the fan connections and 100R is far too low in value, the resistors alone would dissipate 2.25W each! What Klaus is suggesting is...20 replies | 768 view(s)
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15th October 2019, 16:56Yes, you can use two 7815 regulators to drop the 30V down to two 15V supplies but the drawback is they will almost certainly run very hot. They have...20 replies | 768 view(s)
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15th October 2019, 16:47betwixt replied to a thread Mains leaking currents causing problems in my house in Elementary Electronic QuestionsI think the "not grounded" indicator is to warn you the protection isn't going to work. All 'surge protectors" and similar protection devices are...46 replies | 2395 view(s)
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15th October 2019, 14:34Generally not a good idea but it depends on the actual fan design. Most low voltage DC fans do not draw a precise current and it quite likely goes...20 replies | 768 view(s)
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14th October 2019, 23:46You understood correctly, but in this application you DON'T want the diode to conduct so it is wired the other way around. It will still conduct when...8 replies | 409 view(s)
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14th October 2019, 21:01Almost, the diode is in the right place but the arrow should point upwards. As shown it will conduct when the switch is pressed and divert the...8 replies | 409 view(s)
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14th October 2019, 13:19betwixt replied to a thread Algorithm to estimate given battery chemistry and capacity in Power ElectronicsVehicle charges, even most mobile phone chargers, have a communication path to the battery management system. They can tell the requirements by...3 replies | 301 view(s)
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14th October 2019, 13:13Your claims don't seem reasonable. How could a residual voltage of '+/-25V' appear on a 12V output? Are you saying it went up to 37V or down to...6 replies | 247 view(s)
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14th October 2019, 13:05Without knowing the exact specification of the power adapters nobody can tell you exactly. A GUESS would be: 100 adapters at 6W each = 600W DC...7 replies | 284 view(s)
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14th October 2019, 08:56That is correct. With no power applied, there is no path to power the relay coil. When the switch is pressed, power reaches the coil and the...8 replies | 409 view(s)
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13th October 2019, 22:11betwixt replied to a thread how to change pir sensor coverage angle? in Elementary Electronic QuestionsI wouldn't 'tweak' a commercial product, I would start from scratch. I assume this is just a one-off project and not for mass marketing so I would...12 replies | 699 view(s)
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13th October 2019, 21:50You almost have it right. the relay contacts on the left go across the momentary switch instead of chassis. Basically, it makes it think the...8 replies | 409 view(s)
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13th October 2019, 09:01betwixt replied to a thread Will the TVS diode protect the DC line from AC power? in Elementary Electronic QuestionsThe TVS will protect against excessive voltage provided the current is limited to a suitably small amount but it will not protect against the...3 replies | 290 view(s)
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12th October 2019, 19:34betwixt replied to a thread Protecting the inputs of HV7802 current monitor from damage due to inrush current in Analog Circuit DesignI think that should be 100uV not uA Klaus ..... but we know what you mean :-D Brian.4 replies | 294 view(s)
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12th October 2019, 19:32betwixt replied to a thread Mains leaking currents causing problems in my house in Elementary Electronic QuestionsBeware, most 'plug testers' work by looking at the difference between the three pins, live, neutral and earth. As you only have two pins it may not...46 replies | 2395 view(s)
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12th October 2019, 19:21betwixt replied to a thread how to change pir sensor coverage angle? in Elementary Electronic QuestionsThat is exactly the thing but it only has a range of 10m (about 30 feet) so you would need more than one to give the 50' length you need. With a...12 replies | 699 view(s)
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12th October 2019, 19:18It is a standard 18650 Lithium Ion battery. There are many chargers for it if you search with that number. There are three wires, one will be a...4 replies | 399 view(s)
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9th October 2019, 14:11betwixt replied to a thread FSK 1200baud discrete "modulators". What do you think? in Digital Signal ProcessingThe problem is the frequencies are low compared to the data rate. A change to logic high or low is likely to result in partial cycles of the tone and...5 replies | 1098 view(s)
About betwixt
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- Retired senior engineer for a test equipment company but still very busy!
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PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
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