KlausST
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Yesterday, 08:06Hi, Maybe it's time to start from the beginning ... An engineer should start with specifying the requirements (forget about all the ADC and SPI...38 replies | 1620 view(s) -
17th October 2019, 18:17Hi, Maybe a production problem .. some 32768 Hz XTALs donīt like ultrasonic cleaning. Klaus9 replies | 316 view(s)
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17th October 2019, 16:31KlausST replied to a thread Getting trigger signal for 555 timer from elevator button. in Elementary Electronic QuestionsHi, there are millions. For a million of different requirements. But the most important - IMHO - is a proper PCB layout. The next important is...7 replies | 216 view(s)
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17th October 2019, 13:03KlausST replied to a thread Getting trigger signal for 555 timer from elevator button. in Elementary Electronic QuestionsHi, then itīs most probably an EMC problem, not a problem of the schematic. Use: (urgent) * PCB with solid GND plane * proper decoupling...7 replies | 216 view(s)
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17th October 2019, 12:25Hi, I donīt understand. Isolated but with no switching regulator. Due to the RS-422 you need energy to drive the 50 Ohms impedance signal...3 replies | 142 view(s)
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17th October 2019, 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) Klaus7 replies | 216 view(s)
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16th October 2019, 23:19Hi, Datasheet says: Did you read and follow the application note? Klaus9 replies | 316 view(s)
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16th October 2019, 23:12Hi, I agree. But the OP asks about series connection. Klaus20 replies | 588 view(s)
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16th October 2019, 23:08Hi, Please read all my posts...especially those with "sampling rate" and what is meant with "toggle NSS". It's all written already. Klaus38 replies | 1620 view(s)
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16th October 2019, 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 | 285 view(s)
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16th October 2019, 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...20 replies | 588 view(s)
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16th October 2019, 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 | 236 view(s)
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16th October 2019, 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,...20 replies | 588 view(s)
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16th October 2019, 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 | 177 view(s)
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16th October 2019, 06:21Hi, read my previous posts that's the wrong way round Klaus38 replies | 1620 view(s)
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16th October 2019, 00:55Hi, If I need to know that, I'd compare the datasheets. I'd focus on voltage levels, timing... Klaus2 replies | 122 view(s)
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16th October 2019, 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 | 285 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 Klaus20 replies | 588 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...38 replies | 1620 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...11 replies | 447 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 | 532 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 | 236 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 | 233 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 | 532 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 | 233 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 | 177 view(s)
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15th October 2019, 06:32Hi, * bad DVM * bad -5V power supply * too high current Klaus5 replies | 233 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...38 replies | 1620 view(s)
About KlausST
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