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Electrical Engineering

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Fundamentals of electricity, electronics, components, or theory

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I want to learn how to design a simple current source using a BJT. I found this picture on another site (https://www.wellpcb.com/blog/pcb-projects/constant-current-source/?utm_source=chatgpt.com), but ...
cosmin's user avatar
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4 votes
2 answers
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Answer to 2 is D and to 4 is B. I'm having trouble understanding the logic behind these answers. For Q2: How will closing switch #4 prevent lamp from lighting up? Wont current just flow through both ...
Douge Mrdouge's user avatar
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I am reading LINEAR CIRCUIT ANALYSIS by DeCarlo and Lin. The books states KVL in two ways. I wanted to ask if the second way offers extra functionality or simplifies some abstractions. Or it is just ...
Pranstein's user avatar
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I have been perplexed recently with regards to people on a forum, stating that it is unsafe to put 240vac directly into a basic potential divider. The divider was literally 210k ohms, with 3 resistors....
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I have purchased a 12vdc horn siren: https://www.amazon.co.uk/dp/B0CHM41B54?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 (I hope that does not get flagged as spam! If it does then I do not really know ...
Cheesus Toast's user avatar
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If a squeezy bottle of water is high-volume and lower-pressure is the equivalent of that in electricity high-amps and low-volts?
leeand00's user avatar
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This is more a basic circuit question than specific to transistors. So if a high enough voltage is supplied to the base of the transistor, the path between the collector and emitter is open. Thus ...
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I'm trying to make constant current with a sine pulse as an assignment from my project supervisor, the problem is I really can't imagine what a constant current that has a sine pulse at all, it just ...
17 Trịnh Hữu Phúc's user avatar
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Consider this simple LTspice simulation: two diodes in anti-series, supplied by a 20 V 10 Hz sine generator with a 1 kΩ series resistor. I expected the K node voltage to be always about 0 V. Instead, ...
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8 answers
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I am currently studying EE and am still very early on in my studies. In one of my principles class, my professors showed us the following circuit: simulate this circuit – Schematic created using ...
dvx2718's user avatar
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4 answers
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I've been learning Electronics from scratch and have a few misconceptions. I don't understand why in this circuit point B is at the same potential as point A. It stands to reason that there is no ...
user529812's user avatar
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I was trying to resolve the following problem: A 6.8 kΩ resistor, a 7 mH coil, and a 0.02 uF capacitor are in parallel across a 17 kHz ac source. The coil's internal resistance, RW, is 30 Ω. The ...
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From my understanding, bjts will have a diode from the emitter to the base. I was measuring the resistance of a BJT and found that the resistance between the emitter and base was about 500kohms when ...
MATHAINTMATHING's user avatar
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1 answer
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Based on answers to my previous post - I have a question about basic I2C transactions. If a basic transaction has the following structure: start chip address bytes to chip stop I am wondering if ...
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First of all following experiment with a simulation: I have a basic question to the voltage follower. Normally a voltage follower is constructed the way of the top circuit in the image. And this ...
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