Top new questions this week:
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I have a small signal transformer with values as in the below schematic (the simulate button works well to see the AC response). The values are measured and the simulated AC response agrees sort of …
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When browsing for buck-boost converters I’ve looked at many datasheets and I’ve made an observation that I’d like to question. I have a low-power application and energy consumption is one of my …
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I’ve “scanned” through all possible combinations of values for the current-limiting resistor for the LED input of the CNY17-4 optocoupler, as well as the output pull-up. At 25 kHz, I couldn’…
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The 40 dB gain op-amp circuit below oscillates (rail to rail) at around 140 kHz when there is no signal generator driving Vin. With a signal generator driving Vin at 10 mVpp it’s fine with signals 15 …
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I am modifying a current source/sink and there are three circuits that are relevant which are shown below, all using a MOSFET and an op-amp to stabilize a voltage across a sense resistor. My questions …
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I am trying to find a fault on a multilayer board currently. I use mostly my multimeter in buzzer mode and came across such a situation. When I measured a 1 kΩ resistor in buzzer mode it didn’t beep …
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I am trying to build an automated battery swap mechanism for drones. What I currently have in mind is a battery housing sitting on the drone which has electrical contacts on the inside, and a Li-po …
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Greatest hits from previous weeks:
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For some reason, I understand transistor logic gates, and I am able to solve problems, but for some reason I do not understand the and / or logic gates constructed by diodes. If someone can explain it …
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Power supplies are available in a wide range of voltage and current ratings. If I have a device that has specific voltage and current ratings, how do those relate to the power ratings I need to …
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I have gone through various sources… But I am not quite sure what it is.I want an and gate and the logical equivalent is two inputs feeding to one gate and for Y=AB’ the logical equivalent is …
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By the side of my earphones, there’s a switch that flips between two initials, IP and NK. This Quora question suggests that this is the IP / NK transformation, which somehow makes the earphone …
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I am connecting up an AC motor and was wondering if this labeling system was representative of something? Or just another set of letter like X,Y,Z? I could not find any information regarding this in …
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What is the extra, 5th, pin on micro usb 2.0 adapters for? Here is an image with the different connectors. Most of them have 5 pins, but the A-type host only has four. (source: wikimedia.org)
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If I pass a current through a copper conductor, how can I calculate how hot the conductor will get? For example, if I have a 7.2kW load powered by 240VAC, the current will be 30A. If I transmit this …
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Can you answer these questions?
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I have a gaming fightstick which I don’t want to install any additional buttons into. I need help with connection or a circuit so when I press two buttons (eg select & start), it triggers a third …
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I was trying to tinker around with a 555 timer, but I don’t have any 100 nF capacitors for pin 5 the control voltage. Can I use a 68 nF capacitor? I also thought about stacking two capacitors in …
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While designing a Raspberry Pi CM4 application board, I found an issue with the power supply. I selected the same IC as the official CM4 I/O board: the AP64501SP-13. I used even the same values for a …
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