The diagram that shows how the parts are hooked up logically. If your question is about a specific schematic software package, use that tag instead.

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1answer
19 views

Schematic Check for Color Organ

I am making a small color organ just for proof of concept fun. I am using 3 passive low, band, and high pass filters with their outputs connected to an envelope detector and a BJT that drives each ...
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votes
1answer
50 views

Laptop Motherboard Schematics [on hold]

I am working on a bunch of Hp laptop motherboards. These models are variations of HP 15-f Models They have different model numbers but the boards PCB looks the same just different variations of the ...
0
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0answers
17 views

Can I connect many SX1272 (LoRa) based devices to a gateway?

Simple question: Is SX1272 chip by Semtech capable of sending data to LoRa gateways? I'm a little bit confused about LoRa and LoRaWAN. What is the difference?
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votes
2answers
64 views

Capapcitor value in schematic with “mk” units

I've got a schematic that originated in Brazil that generally uses European symbols rather then US. But some values for capacitors are confusing me. There are several that are marked 100n and so ...
0
votes
1answer
28 views

how to remove this error “ERROR 152: Port on instance does not exist in entity declaration for instance”?

I am new to Cadence Allegro HDL for schematic design and for my first design i got this error. In 728 page document provided by cadence its is mention as follows, "Open the symbol for the component in ...
3
votes
2answers
51 views

Proper Arrow Directions for Off Page Connectors / Symbols…

Good day everyone, As I understand it, there are two kinds of objects that can be used on a schematic to indicate that the Net to which they are attached is connected to a location elsewhere on the ...
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0answers
37 views

Missing Bipolar Definition for “PNP”

I've been making a schematic diagram for an LDO which has a 'Vref' subcircuit which contains 4 PNP bjt's. Now when I run the schematic to produce a netlist, a fatal error (image shown) occured. How ...
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2answers
90 views

Creating electronic parts from scratch [closed]

So I want to create my own electronic parts from scratch,I don't like buying stuff from internet because it's mostly expensive and I believe if you make it yourself its more cheaper. You might ask ...
3
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1answer
54 views

How to represent socketed components in schematic

What method do people generally use to represent socketed components in a schematic, notably in this case I am referring to resistors & capacitors mounted into machined socket pins (multiple into ...
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0answers
22 views

Sync. system with output equals to input (t - 2)

I have this table: The upper one is (on hebrew) input, and the second line is output. The first and second input are irrelevant, but on the table above it is ...
0
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0answers
33 views

KiCad Eeschema zoom causes poor rendering

I recently installed KiCad to use at home (I'm familiar with Altium at work but $$). I've only just started using it and seem to be having trouble with zooming on the schematic (Eeschema). If I zoom ...
1
vote
1answer
62 views

SX1272 - LoRa - What is the minimal schematic (needed capacitors/resistors) to use that device?

I'm interested in SX1272 by Semtech. It's a LoRa modem. I'm not the best at reading datasheets. Maybe it's because of my poor English. I wonder what is the minimum schematic of such a chip? What ...
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1answer
48 views

Please review my RGB Controller

First off, I just want to say that I'm still pretty new to PCB and schematics design, and electronics in general, so any suggestions on improvement are much appreciated! I'm creating a basic circuit ...
0
votes
1answer
31 views

NJM2072D Application Questions for Audio Detection Circuit

I am building an audio switch with channel priorities. I will use this in car events where we communicate car-to-car on FRS radios. A few of us also use 2 meter amateur radios for longer range ...
9
votes
1answer
507 views

What does this schematic symbol mean (similar to solder bridge)?

this symbol is similar to solder bridge, but there is a connection on both end. what does this symbol mean, and what is the equivalent pcb for this symbol
2
votes
1answer
35 views

Questions about FM Mic Kit Schematic

I'm currently building an FM Microphone kit and I'd like to understand its operation before physically putting it together. The documentation only provides an overview of some aspects and provides no ...
0
votes
3answers
199 views

How ro get more watts from a 1w amplifier?

I'm a newbie in the world of electronics, and I decided to build a 3watt amplifier. I searched arround the web and I found the following schematic for a 1w amplifier: My question is: • What is the ...
0
votes
1answer
37 views

Different bus representations on schematics?

Here is an excerpt from a sample "data flow" diagram: Now both lines in both circles represent buses but in #2, there is no bus arrow that goes to the IC. What is the difference between them? Does ...
-2
votes
1answer
115 views

Schematic of switching power supply 230V to 5 / 3.3 VDC [closed]

I would like to ask you if you have the schematic of the power supply mentioned below. There are various variations but the input is always AC 85-265V 50/60 HZ while the output is, depending on the ...
0
votes
1answer
94 views

Questions About Schematic

I am working on a color organ and want to use a design similar to this. I understand the gist of the schematic, but I have a few questions about it and how it works. First: I understand that it is ...
0
votes
1answer
99 views

How does this reverse NOT gate work?

I created a 74LS181 circuit in Logisim based on TI's datasheet. Notice how the NOT gate for the B0 input has a dot before the triangle: Here's a screenshot of my circuit: Notice that my ...
0
votes
1answer
63 views

Hey I am using 2 4N35 Optocoupler from Visha can I replace them with a single ILD615 from Vishay?

I went through both datasheets and i think it should work. Basically I am asking if the dual channel version of 4N35 is the 8 dip ILD615. Thanks. edit: I have added the picture. my circuit is like ...
2
votes
2answers
86 views

Does a switch schematic symbol have a conventional “polarity”?

I'm studying Rudy Severns eBook Snubber Circuits for Power Electronics; great read by the way. In it he has the following figure, notice the phrase in the caption "including voltage and polarity ...
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2answers
71 views

Does the order of connections on a protoboard matter?

I am a beginner in the field of electronics. I am trying to learn about applying schematic diagrams to protoboards. Let's say that I have a schematic depicting connections between pin #2 of a ...
0
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0answers
71 views

Temporary key switch on keyboard

Okay, have been doing a bit of research, but still have came up short on my quest. I want to know what component to use for temporary switching keys on a keyboard. I play a game that uses the "q" and ...
4
votes
1answer
678 views

Why Do Pin Numbers Sometimes Look Like Reference Designators? [duplicate]

Sometimes when I look at schematics like the Beagleboard and the Raspberry Pi, some of the pin numbers look like reference designators, like C10. And what makes it even more confusing is that there is ...
0
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1answer
64 views

schematic errors in eagle regarding vcc and vdd

Hello somebody there ? Can someone explain to me why VDD is connected to VCC directly ? Call me stupid but this cant be right . I hope I am stupid and to be able to learn something out of this :+1: ...
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1answer
50 views

Are pins of WOG bridge package numbered?

The WOG package used for a diode bridge looks like this: As I'm preparing a PCB layout footprint for this device, I need to assign pin numbers. Those pin numbers map to the schematic and ensure the ...
2
votes
4answers
132 views

Would this lazy zero cross detector work?

Task: Design a ZCD for 230VAC to be interfaced to an atmega168, 5VDC. The pictured optocoupler is SFH620A-3. I have on hand 1/4W E24 resistors. I am extremely lazy and want to go away with as ...
3
votes
1answer
380 views

Correct SPI Configuration?

I'm still not entirely clear on TTL, so please, forgive my ignorance in this. I have a sensor and a microcontroller. The sensor is a BMI055 Gyroscope and accelerometer. The microcontroller is the ...
1
vote
1answer
94 views

Electrical schematics component ID's

Is there a list of standard ID codes used for components on a schematic drawing that anyone can point to? e.g. K = Contactor S = Switch Y = Solenoid X = Terminal strip etc. Any list would be ...
1
vote
2answers
102 views

What is this symbol called?

I have a schematic and there's this symbol I don't understand. I tried reading list of circuit symbols but couldn't find a match.
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0answers
35 views

How does this simple 2 NPN, 2 cap, 4 resister flashing circuit work? [duplicate]

I discovered this circuit and I am fascinated at how simple and effective it is. I am also unable to figure out how or why it works. Can some one explain how the is circuit is able to flash? You ...
2
votes
3answers
42 views

improve IR reciever

I have simple IR receiver without any modulators, which reacts for IR wave (940 nm) link , I connected it as on this schema I beam on this receiver with laser diode with 650 nm lenght wave light. ...
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0answers
60 views

Connecting high power LEDs

I need to connect 12 10W LEDs in 6x2 or 2x6 configuration. Each LED has a voltage drop of 9-12V and 1050mA forward current. An Online calculator proposes such solution: ...
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0answers
13 views

gEDA command line tool to update an attribute of a component

Is there any command line tool, which can be used for updating the value of an attribute of a component having a valid refdes? For example: ...
3
votes
3answers
190 views

Microcontroller power directly from SMPS DC-DC (SPR01 series) - is it OK?

Is it OK to supply power durectly from 5V SMPS DC-DC converter? Of course I will put several capacitors: at the DC-DC output (I'd put 1uF or something), at the controller power input(s) (I'd put ...
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votes
2answers
66 views

How would I create this kind of circuit?

I'm just starting out with electronics, this should explain why my "schematic" is so readable. I'll attach it and explain further. I know how to create a simple circuit with the main slide switch and ...
0
votes
3answers
104 views

How to interpret negative voltage in this schematic?

I got the following schematic from a book. This schematic was shown during a discussion about loads in voltage divider which require negative voltage. Questions: The voltage value -25V at the ...
14
votes
7answers
1k views

What process do you use to ensure your PCB works on the first try? [closed]

What are the best practices for catching stupid mistakes vs more subtle ones? Do you run over a checklist of things for each design? If so, what kinds of things are on it? I'm interested in ...
0
votes
1answer
85 views

Difference between buses and nets

In short, what is the difference between buses and nets? Read some questions that seemed somehow related but still it is not clear for me. Related: How to use Altium Buses? ...
1
vote
1answer
56 views

Get rising edge using diode

Here is circuit from Horowitz's "Art of electronics" book: The problem is that I can't get expected signal from R2 resistor in OrCAD: Here is diode pass both rising and falling edges.Why? EDIT: ...
0
votes
4answers
205 views

Why is designed active low?

I buy a 2 channel relay module for Arduino. I surprised that why this relay module is designed active low? Circuit: i means that when we connect In1 to low V (GND) relay turn on. Is there any reason ...
-2
votes
1answer
100 views

AVR - ATMEGA328p ADC keeps returning 1023

We have developed an Atmega328p based Kit. We want to read some analog sensor values in the application. But analog readings always returns 1023. Even If we connect GND pin with analog pin, it gives ...
-1
votes
1answer
116 views

Building a linear Power supply

Being a poor student and a hobbyist, I've decided to build a power supply. For simplicity's sake, I've chosen a linear supply, build around 2 variable independent channels with 3 commonly used taps - ...
0
votes
0answers
60 views

Component IC does not work for different schematics

I tried to make some component IC in proteus. I found some YouTube videos about it and successfully ( I guess ) design one. It works perfectly on that schematics. But when I tried to use it on ...
1
vote
2answers
90 views

Does 3x22μF mean three capacitors of 22μF in parallel or series?

In the following schematic (TPS63061) several capacitors are denoted as multiples. As a newbie I am unfamiliar with this notation: does 3x22μF mean three capacitors of 22μF in parallel or series? ...
0
votes
1answer
41 views

Request, software to draw publishing quality diagrams [duplicate]

I'm trying to find a new solution for nice publishing quality schematics (as opposed as prntscreen ltspice as I'm doing right now) I downloaded dia and toyed with it but it doesn't seem to have a ...
2
votes
1answer
56 views

What are “islands” on circuit diagrams?

On many schematics I saw areas, which are apparently not connected to other parts of the scheme. For example, below is a part of Arduino Uno diagram: As you see, below are two "islands" which are ...
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0answers
72 views

Schematic is not working?

I have a schematic that I turned into a PCB, but to my dismay, it is not working and I can't figure out why. Here is my schematic : I have tested the board with a multimeter (3.275v and about ...