Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [schematic]

101 questions
18
votes
3 answers

Is there a convention for documenting a schematic with notes?

I want to add an explanation as to why I’ve done something a certain way (mostly for my future self) on my schematic. Yesterday when reviewing a circuit from last year, I asked myself “why the heck did I do that?!” And after changing the design to…
Nick Bolton
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16
votes
2 answers

Strange diode symbol in schematic

Does somebody know what the parts "D1" (top left) and "D2" (bottom left) are? I would expect them to be a special kind of diode, but I have never seen this symbol before in 10+ years of electronics.
Marc
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12
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4 answers

Why is there a polarized capacitor symbol in an AC circuit?

I am confused. My question is very basic, someone please enlighten me. If polarized capacitors should not be used in reverse polarity then why does every textbook (like the one I am using, Grob's Basic Electronics) show polarized capacitor symbols…
Asim
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8
votes
4 answers

How to follow the signal when reading the schematic?

I am learning how to read schematics. Are there any guidelines or good practice on reading schematics? It's my understanding that schematics are read left-to-right and that is how one should follow the signal: from left-to-right. Is that correct and…
komrad2236
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8
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3 answers

Why is there a 2 in front of some of these passive component parts?

Why is there a 2 in front of some of these passive component parts?
Bringle
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7
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1 answer

Unknown circular schematic symbol

This is the symbol that I do not know what it means. The top trace leads to a polarized capacitor
Koltin
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6
votes
2 answers

What are these short parallel lines around a connection line in a schematic?

I am examining the Analog Devices AD74413R and came across a symbol in the evaluation board schematic I am not familiar with. There are small parallel lines around connection lines in various sections of the following schematic: These seem to be…
JYelton
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6
votes
2 answers

What does a capacitor marked "105 | 47 μF" mean?

Attached schematic for the e-Paper driver HAT. The meaning of the yellow marked part is not clear to me. Does this mean I can replace 105 (1 μF) with 4.7 μF and use either as available? The entire schematic can be found here.
Just doin Gods work
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6
votes
3 answers

What schematic symbol is this switch with an arc?

I've referenced many symbol sheets with no avail. What would JP5 'AutoON' be here? I assume it's a switch that is default on, but the symbol is foreign to me.
Blake
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5
votes
2 answers

LM10 schematic transistor symbols

I'm trying to figure out what certain elements of the transistors from the schematic in the LM10 datasheet represent and I hope someone can help. In the attached image I have several questions: In Q1, what is the cross bit that looks like a…
user311088
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5
votes
2 answers

Help with 144Mhz small signal amplifier not amplifying

I attempted to build a single transistor amplifier to try and increase the voltage signal coming from a Si5351 module, set to 144 Megahertz. My primary goal is to increase the voltage about 3 to 4 times. The default output of the Si5351 with 85ohm…
niko20
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4
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3 answers

I need suggestions/feedback on my simple active balancer schematics for two 12V batteries in series

Since I currently use a 24V battery system for my house using 16 12V car batteries (2 parallel banks of 8 in series with each other) and use the lower 12V side for additional devices, (as well as due to the difference in age between batteries and…
Edin Fifić
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4
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2 answers

What is this component, and did I make this schematic correctly?

This control board is from a mini-split heat pump. It sits on the outside of the unit and receives signals from a remote control. It's from this discussion here. It's a single-sided board - am I getting the schematic correct, and is this typical…
Harper - Reinstate Monica
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4
votes
1 answer

4-20mA ADC, HV DC measurement & DC/DC PSUs schematic validation

Hello i am designing a small Li-ion battery charger based on an custom generator which produces 36v DC output and i have designed a PCB that controls the whole procedure and logs the measured data to an SD card using an esp32. I also have a 4-20mA…
geocheats2
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4
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1 answer

How do I tell KiCad where the power is coming from on a Eeschema

The problem I am a beginner/novice using KiCad and in creating PCB's, so I do not know much about these things. After following tutorials from YouTube I managed to create or copy symbols to my library and connect footprints to them. But now, when…
guttih
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