Top new questions this week:
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My multimeter does not have pF resolution and I am not able to find any tools which can measure a pF capacitance. My goal is to identify the capacitance of a 0603 capacitor that I have removed from a …
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I am looking at thick film chip resistors. If a 2512 resistor has a 2W power rating, can I parallel two to get 4W total power rating? Will the heating of the resistors increase resistance so as to …
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I am designing the architecture of an embedded system, and I have to decide between setting the power rail at 3 V or at 1.8 V. The system will have an MCU, memory and a few sensor ICs. Depending on …
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I am working on a project for LED control with MCU and LED drivers. I have an input voltage of 24 V and a DCDC converter to 3.3 V for the MCU. Each LED controller will have an output current of 1 A. I …
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I am designing a circuit which will control many electromagnets. Shift registers will be used (74HC595) to control MOSFET gates directly, with proper gate resistors (the MOSFETs will be switched at …
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Summary / Question I have this PCB (top only): There is essentially no “signalling” happening here, and the only divergences from steady-state are when the input AC (T1) turns on or off, or …
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What is the correct range of frequencies for radio waves? Wikipedia’s article on radio waves states that all frequencies below 300 GHz are radio waves, while the article on the radio spectrum states …
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Greatest hits from previous weeks:
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I know that electric vehicles have different performances depending on battery and motor, but it’s not clear how electrical and mechanical units are related. Can anybody please help? Will a 100V …
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Why do you need to store the voltage for some time in a capacitor? I’ve always assumed circuits to work when you power it on and stop when you power it off. Why can’t the whole circuit be drawn …
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What is a decoupling capacitor (or smoothing capacitor as referred to in the link below)? How do I know if I need one and if so, what size and where it needs to go? This question mentions many …
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What’s the difference between a microcontroller and a microprocessor?
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On a printed circuit board, I see lots of tiny letters and numbers. Is there some kind of standard that dictates what letter indicates what type of component?
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I want to add a real time clock module into my little project. I want to display both time and date on my existing i2c 2×16 LCD module. Both i2c-interface real time clock module and 2×16 LCD module …
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I’m trying to find replacement batteries for my UPS, I checked my local store and they dont’ have this particular model I need so I’m looking for other brand that does exactly the same. What I …
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Can you answer these questions?
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This is a portion of the schematic of an old (80s) audio synthesizer/effect (Roland Juno 6). The two inputs are triangle waves (opposite phase). The circuit shorted by TR8 and TR17 is not shown for …
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I would like to model the following circuit in PSpice: It is a single-pole, triple-throw switch implementation. I have tried to model it using Sbreak like below, however, I get a floating node error. …
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I am looking at this infrared LED: www.vishay.com/docs/84240/vsly5940.pdf It seems to indicate a “Forward Current” of 100ma, a “Peak Forward Current” of 200ma, and a “…
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