KlausST
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Today, 13:39Hi, The two resistors are no "15V" generators. They just divide the input voltage by 2. --> If your supply voltage is 10V then the voltage at...16 replies | 316 view(s) -
Today, 07:58Hi, What advice do you expect? Cutoff voltage depends on battery, not on application. For sure you may measure the battery voltage...but it...5 replies | 154 view(s)
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Today, 07:01Hi Try this: * NPN, PNP, 2x R = 4k7 Wire it this way: * 30V --> NPN_C * NPN_E to PNP_E = 15V output * PNP_C to GND * resistors in series,...16 replies | 316 view(s)
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Today, 06:27KlausST replied to a thread Holding button for 2s to trigger 555 timer in Elementary Electronic QuestionsHi, On button press: the capacitor gets slowly discharged by a high ohmic resistor On button released: the capacitor fastly gets discharged via a...2 replies | 126 view(s)
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Today, 06:21Hi, read my previous posts that's the wrong way round Klaus33 replies | 1396 view(s)
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Today, 00:55Hi, If I need to know that, I'd compare the datasheets. I'd focus on voltage levels, timing... Klaus2 replies | 95 view(s)
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Today, 00:49KlausST replied to a thread L293d - Input Voltage (motor operation) in Hobby Circuits and Small Projects ProblemsHi, You should not guess, better read the datasheet. It clearly says every input voltage above 2.3V is valid HIGH level. Better than long...2 replies | 119 view(s)
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Yesterday, 22:22Hi, A power voltage divider could be made with two equal resistors, an NPN and a PNP... Not very precise, but good enough for fans Klaus16 replies | 316 view(s)
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Yesterday, 21:40Hi, Your scope picture (especially the upper one of post#29) is awful. Don't you recognize that the sampling rate is much too low for your...33 replies | 1396 view(s)
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Yesterday, 21:10Hi, From your first post I thought about sinusoidal waveform with positive and negative voltage swing. Now it seems to be a squarewave... with...7 replies | 247 view(s)
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Yesterday, 13:50KlausST replied to a thread [SOLVED] USB to RS232 exactly similar to COM1 in Service Manuals, Requests, Repair TipsHi, draw a sketch. Klaus9 replies | 348 view(s)
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Yesterday, 13:47Hi, it (solely) depends on the battery. Read the battery datasheet or contact the manufacturer. Also visit www.batteryuniversity.com Klaus5 replies | 154 view(s)
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Yesterday, 13:44Hi, I doubt the PCB is getting hot. Usually the electronic parts getting hot. .. and only some of them. To detect which one is getting hot: ...5 replies | 194 view(s)
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Yesterday, 08:03KlausST replied to a thread [SOLVED] USB to RS232 exactly similar to COM1 in Service Manuals, Requests, Repair TipsHi, No. It just says it works with your computer, but it does not say anything about compliance. ***** True: RS232 idle state = high = 1 =...9 replies | 348 view(s)
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Yesterday, 07:47Hi, First you need to determine: * How much current can your supply deliver * How much current do you expect your circuit to draw * Measure how...5 replies | 194 view(s)
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Yesterday, 06:40Hi, There is no GND plane? Is it? (Maybe you used copper pour --> this is not compareable to a GND plane) If not: good luck. Especially with...3 replies | 157 view(s)
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Yesterday, 06:32Hi, * bad DVM * bad -5V power supply * too high current Klaus5 replies | 194 view(s)
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Yesterday, 06:29Hi, 1k seems to be OK. But in detail it depends in: * expected speed * drive strength of the output pin * signal trace length, connected...33 replies | 1396 view(s)
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14th October 2019, 22:01KlausST replied to a thread average value of as square wave in Analog Integrated Circuit (IC) Design, Layout and FabricationHi, What "design procedure" ? ...for two parts: R, C. R C low pass filters are explained million times in the internet, since it's probably the...6 replies | 192 view(s)
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14th October 2019, 20:27KlausST replied to a thread average value of as square wave in Analog Integrated Circuit (IC) Design, Layout and FabricationHi, A low pass filter? Klaus6 replies | 192 view(s)
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14th October 2019, 17:28Hi, To be honest: I donīt know the answer. * maybe the copper loss is tested with DC. Then there are additional losses caused by AC: Proximity...4 replies | 170 view(s)
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14th October 2019, 17:20KlausST replied to a thread [SOLVED] USB to RS232 exactly similar to COM1 in Service Manuals, Requests, Repair TipsHi, Read RS232 specifications. There is no need for 11V. If Im not mistaken, then even 3V / -3V levels comply with RS232. If your connected...9 replies | 348 view(s)
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14th October 2019, 17:13Hi, I donīt think this is possible. Most probably the power has a a capacitor at the ouput. It needs a lot of power to charge this capacitor...6 replies | 193 view(s)
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14th October 2019, 17:05Hi, We donīt know about your circuit. We donīt know what kind of ADC you try to build. We donīt know what cutoff frequency you like to have. ...2 replies | 96 view(s)
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14th October 2019, 07:09KlausST replied to a thread Desperate for help (computer fan control) or this could cost huge $$$ in Hobby Circuits and Small Projects ProblemsHi, Did you read the WIKIPEDA article. It says it delivers 2 pulses per revolution. That's all you need. Measure/calculate the count of...7 replies | 387 view(s)
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14th October 2019, 07:02Hi, Simple answer: There is no simple answer for your question. The only thing that is very likely: the less voltage you give to the MCU, the...3 replies | 256 view(s)
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14th October 2019, 06:30KlausST replied to a thread Desperate for help (computer fan control) or this could cost huge $$$ in Hobby Circuits and Small Projects ProblemsHi, Did you do an internet search? https://en.m.wikipedia.org/wiki/Computer_fan_control Klaus7 replies | 387 view(s)
About KlausST
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