FvM
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Yesterday, 23:05It's generally no good idea to operate a peltier element with fixed voltage supply because for each combination of heat sink thermal resistance,...4 replies | 59 view(s) -
Yesterday, 22:19555 datasheet has application circuits and formulas for pulse width and frequency calculation. As for the 27 MHz generation, I was expecting a...8 replies | 100 view(s)
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Yesterday, 22:11Do you have a full datasheet with I/V/ΔT curves? What's the expected hot side temperature for -30° cold side? Did you check the actual temperature? ...4 replies | 59 view(s)
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Yesterday, 13:53Have a 555 circuit generating the modulation waveform and a 27 MHz crystal oscillator enabled by the pulse signal. 8 cm is rather short for 11m...8 replies | 100 view(s)
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Yesterday, 13:47FvM replied to a thread [SOLVED] LM741 Amplifier not working with IR2110 IC [PROTUES] in PCB Routing Schematic Layout software and SimulationThe design fault is to connect VDD to 12V, with 5V supply, the IR2110 logic inputs can be driven by processor signals directly.4 replies | 113 view(s)
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Yesterday, 13:42This sounds rather confused. Buffering the controller supply for 50 ms shouldn't be a problem, how 5 A and 50 mF come into play?11 replies | 241 view(s)
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Yesterday, 12:16dpaul replied to a thread dft-how to use .bench format in ASIC Design Methodologies and Tools (Digital)Seems that some people are working with .bench files in the same time frame. Similar post in the Xilinx forum:...1 replies | 103 view(s) -
Yesterday, 09:44FvM replied to a thread Problem with my echo circuit using PT2399 in Hobby Circuits and Small Projects ProblemsThe standard PT2399 application circuit is sending the low-pass filtered original signal to the output, that's not appropriate for an echo effect...3 replies | 154 view(s)
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Yesterday, 09:35FvM replied to a thread what's the rf cavity filter tuning principle in RF, Microwave, Antennas and OpticsYour colored hand sketched annotation of the drawing makes no sense, particularly the blue circle around a coupling slit. There's no tuning bolt in...6 replies | 190 view(s)
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Yesterday, 09:22FvM replied to a thread Hand soldering a 6x6mm QFN (28pin) in Hobby Circuits and Small Projects ProblemsDon't necessarily need stencil, applying solder paste with a syringe is possible as well. Reflow by hot plate or hot air.2 replies | 68 view(s)
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18th July 2019, 22:08Source = the voltage you are probing93 replies | 2342 view(s)
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18th July 2019, 16:35FvM replied to a thread What is this sensor? (Can detect the clap sound) in Service Manuals, Requests, Repair TipsIt looks quite similar to an ultrasonic piezo transducer. I doubt that it has much sensitivity in the audible sound range. Measuring the resonance...4 replies | 147 view(s)
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17th July 2019, 22:2410 pF input capacitance is still large for an active 100 MHz probe but at least acceptable for a number of measurement problems. To realize the...93 replies | 2342 view(s)
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17th July 2019, 21:59FvM replied to a thread Questions about a circuit interfacing a DC fan via open drain way in Analog Circuit DesignAccording to fan datasheet, the PWM input can be driven by 5V logic directly. No need for additional transistors.7 replies | 239 view(s)
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17th July 2019, 21:47Sure, if parasitic capacitance causes the voltage drop, it must have a similar value. But is the capacitance value realistic? Capacitance can be...76 replies | 2511 view(s)
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17th July 2019, 11:39Parasitic capacitances surely matter, surprising that you start now to think about it. 2 x 2nF however isn't but a shot in the dark and should be...76 replies | 2511 view(s)
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17th July 2019, 11:24FvM replied to a thread Power Supply for M95 GSM module to be compatible with ATEX limitations. in Professional Hardware and Electronics DesignI don't see that any of the V, I or P limits can be achieved other than with active electronic circuits. There are some issues like avoiding...7 replies | 1063 view(s)
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17th July 2019, 10:21FvM replied to a thread what's the rf cavity filter tuning principle in RF, Microwave, Antennas and OpticsThe tuning method can be basically described as variable capacitance. To understand the whole filter design, including the tuning options, you should...6 replies | 190 view(s)
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17th July 2019, 09:17Choosing the capacitor for exact series resonance is of course possible, but we have to consider the complete circuit. At the end of the day, the...5 replies | 216 view(s)
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17th July 2019, 09:10You can with multiple transmission line stubs. Obviously not all exactly quarter wave length. Smith chart tools like SimSmith will help you to design...2 replies | 143 view(s)
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17th July 2019, 09:03With effectively no voltage across the capacitor, X7R should be o.k. Major manufacturers have individual datasheets for capacitors, see e.g. Murata...5 replies | 216 view(s)
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16th July 2019, 21:57Next step is to make informative measurements, e.g. oscilloscope waveforms.4 replies | 339 view(s)
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16th July 2019, 18:23I would assume that the code is executed out of the flash memory rather moved to RAM. In this case, the RAM #WR signal won't be pulled low before a...4 replies | 159 view(s)
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16th July 2019, 08:51FvM replied to a thread can triacs rapidly switch AC into a transformer in Elementary Electronic QuestionsGate driver should be of course referenced to common source node. There are several reasons why the "chopper" circuit can't be used in the shown...7 replies | 222 view(s)
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15th July 2019, 13:00Perhaps we can paraphrase the question: Is it reasonable to start system level microcontroller programming without studying the datasheet...2 replies | 149 view(s)
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15th July 2019, 12:47I believe the question has been already answered by Akanimo. All externally connected IO pins, user clock, reset etc. must be present in the top...19 replies | 912 view(s)
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15th July 2019, 07:43The PWM circuit makes no sense as drawn, please review. I guess the µC PWM output should be controlling the switch, not feeding a switch terminal. ...5 replies | 228 view(s)
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14th July 2019, 23:28I mean one multitap voltage divider instead of three. 3 kV/mm is a large multiple of the clearance values suggested by safety and PCB design...93 replies | 2342 view(s)
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14th July 2019, 23:00FvM replied to a thread Looking for SPICE model for coupled lossy transmission line in Electromagnetic Design and SimulationIf you want a S-parameter model, why are you asking for a SPICE model? A simple behavioral model with constant delay and sqrt(f) proportional losses...7 replies | 295 view(s)
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