Top new questions this week:
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I work at an electronics store and the other day a customer came in who was rebuilding a circuit board. I sold him some resistors, but later he came back in wanting to return some of them because they …
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When teaching electronics to college students, we often use these large 1 W cylindrical resistors – not because we need the wattage rating, but because they are easy to handle and read the color code …
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I sometimes see these devices along power lines when I’m driving and was wondering what they were. They look just like the regular transformers that I see on top of electrical poles, but it seemed …
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I am designing a circuit that will be powered by 3 AAA batteries. I know that the nominal voltage of an AAA battery is 1.5 V, but I also read on the internet that the open-circuit voltage could be …
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Home hobbyist here, just trying to learn. I’m trying to calculate voltage drops across the various components, and I’m stuck on R4. I calculated R1 and R2 no problem (I think), using: …
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I read here mentioned The configuration in Figure 1a creates a very linear response in terms of the irradiance of the light source. Would this configuration of photodiode not be linear? Why? The …
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Can someone explain to me how this circuit works? I know D3 is a flyback diode, and BSS138 is a FET which means a low voltage can drive the relay on or off. What is the purpose of D2. Why use two …
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Greatest hits from previous weeks:
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There are a lot of poorly drawn schematics here. A few times people have actually asked for critiques of their schematics. This question is intended as a single repository on schematic drawing rules …
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I have never understood input and output impedances of an op-amp. If anyone can explain what these two terms mean in an op-amp I’d highly appreciate it. Thank you! www.eecs.tufts.edu/~dsculley/…
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In my home, I have some halogen spot lights, which have an energy efficiency rating of ‘C’: I would like to replace them with more efficient LED bulbs, but looking on the Philips website, they claim …
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I have been looking around for an easy way to convert 12V to 5V. I have seen some people saying that a simple resistor is all that is needed. $$ Volts = Ohms \cdot Amps $$ $$ Amps = \frac{Volts}{…
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Flash memory storage and EEPROM both use floating gate transistors for storage of data. What differs between the two and why is Flash so much faster?
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I’ve been trying to design a charging system for a small robot powered by a 2S 20C lithium polymer (LiPo) battery. Were I to trust everything I read online, I would believe that the LiPo will kill me …
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How do I identify the markings on an SMT component and match it up with a part number so I can be a good designer and actually look at a datasheet (and read the whole thing)? Or identify a part to …
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Can you answer these questions?
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I just had some custom Arduinos manufactured, and it’s the first time I’ve included a USB controller, CH340. I’m able to flash the bootloader to the Atmega2560 over ICSP, so the AVR is fine. However …
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I quote from Allen and Holberg, 3e, Pg 468: If a comparator has a large capacitive load, the chances are that it is slew rate limited. Under these conditions, we will show several methods capable of …
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I am trying to design a power supply for portable device and stumbled upon a problem that is probably trivial, but it’s a tough one for me (having no formal electrical education). The device is …
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