KlausST
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Today, 07:32KlausST replied to a thread Getting trigger signal for 555 timer from elevator button. in Elementary Electronic QuestionsHi, There are many solutins. I'd go this way: * use a 10k pullup on TRIG pin to 12V * use a diode from TRIG (A) to the pushbutton (C) Klaus1 replies | 33 view(s) -
Yesterday, 23:19Hi, Datasheet says: Did you read and follow the application note? Klaus5 replies | 184 view(s)
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Yesterday, 23:12Hi, I agree. But the OP asks about series connection. Klaus19 replies | 403 view(s)
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Yesterday, 23:08Hi, Please read all my posts...especially those with "sampling rate" and what is meant with "toggle NSS". It's all written already. Klaus35 replies | 1458 view(s)
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Yesterday, 22:34KlausST replied to a thread L293d - Input Voltage (motor operation) in Hobby Circuits and Small Projects ProblemsHi, General rule: Don't leave any inputs floating, neither at digital ICs nor at analog ICs...as long as it is not mentioned otherwise in the...3 replies | 163 view(s)
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Yesterday, 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...19 replies | 403 view(s)
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Yesterday, 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 | 182 view(s)
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Yesterday, 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,...19 replies | 403 view(s)
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Yesterday, 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 | 144 view(s)
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Yesterday, 06:21Hi, read my previous posts that's the wrong way round Klaus35 replies | 1458 view(s)
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Yesterday, 00:55Hi, If I need to know that, I'd compare the datasheets. I'd focus on voltage levels, timing... Klaus2 replies | 104 view(s)
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Yesterday, 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...3 replies | 163 view(s)
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15th October 2019, 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 Klaus19 replies | 403 view(s)
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15th October 2019, 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...35 replies | 1458 view(s)
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15th October 2019, 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...9 replies | 298 view(s)
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15th October 2019, 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 | 390 view(s)
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15th October 2019, 13:47Hi, it (solely) depends on the battery. Read the battery datasheet or contact the manufacturer. Also visit www.batteryuniversity.com Klaus5 replies | 182 view(s)
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15th October 2019, 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 | 201 view(s)
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15th October 2019, 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 | 390 view(s)
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15th October 2019, 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 | 201 view(s)
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15th October 2019, 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 | 166 view(s)
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15th October 2019, 06:32Hi, * bad DVM * bad -5V power supply * too high current Klaus5 replies | 201 view(s)
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15th October 2019, 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...35 replies | 1458 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 | 202 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 | 202 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 | 175 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 | 390 view(s)
About KlausST
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17th October 2019
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