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Questions tagged [schematics]

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.

0
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1answer
30 views

Altium pin parameters in symbols

thanks for the many great questions and answers over the years. This is my first question. I use Altium Designer for capturing designs. I had an idea to make my processor components a little more ...
0
votes
1answer
29 views

Altium net designator like option?

I'm looking to see if it is possible to label net names in Altium in some way similar to the concept of component designators (eg R? C?) which would enable me to duplicate a section of a circuit which ...
0
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1answer
75 views

Is this notation for a single capacitor or a dual capacitor?

So Im trying to repair the indoor fan on our ducted AC system (2 weeks wait to get it replaced on warranty). Capacity has exploded. I replaced it with a similar cap (8uF 400v) and wired it the same as ...
-1
votes
1answer
58 views

Altering schematic for adaptor

I am trying to make a PCB for the attached schematic (mixer.jpg). Rather than run on 2 9V batteries, I would like to plug it into the wall using a +9 / -9V DC power supply. Do I need both diodes and ...
3
votes
3answers
579 views

How to keep the state of relay

In schematic below when current exceeds the set point of PR1 it toggles the relay and as soon as current drops the relay goes back to normal state: How can i keep the relay state as triggered even ...
0
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1answer
52 views

current sense switch

This schematic triggers the relay when current exceeds 1-3A: I want to do some modification in this circuit; How can i reverse the circuit working to trigger the relay when power connected to INPUT ...
0
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1answer
135 views

Overcurrent protection for DC motor [closed]

I found a circuit to protect DC motors from stalling: this is the schematic: and this is the board I made based on that schematic: When the power is connected to the circuit makes all LEDs on but ...
0
votes
2answers
54 views

Bus vs Signal Harness in Altium

I am designing a Schematics for one of my big project. I am using Hierarchical Design for my project. My Schematics has one processor which has 5 UART. The UART nets have names like ...
-1
votes
1answer
75 views

Light Activated Switch

Can I use a 12 V power supply as the source of electricity for this circuit? And where do I connect the positive/negative of my power supply? I'm a bit new to this so please understand, thank you.
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2answers
107 views

Why is my dark activated circuit not working?

When I turn my circuit on the LED turns on but even in the dark the LED is still on. Can someone help me?
-2
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2answers
55 views

How to convert light activated switch into dark activated switch [duplicate]

Can anyoe teach me how to convert this into light activated switch (https://i.stack.imgur.com/r6lZH.jpg)
0
votes
0answers
70 views

How to convert light activated switch [duplicate]

Can anyone teach me how to convert a light activated switch into dark activated switch vice versa.
1
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1answer
28 views

Connecting multiple Net Labels to same Net Wire

I am using Altium Designer 17. My schematics is Hierarchical and divided into multiple sheets. Few sheets have microprocessor ...
0
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0answers
40 views

Attiny 841 dev board schematic review

I am about to send a custom Attiny841 dev board (aimed at Optiboot) to production and I thought, since I never used netiher this microcontroller nor the USB-UART converter before, I'd come here and ...
0
votes
3answers
108 views

What is the best program for designing circuit diagrams [closed]

I am trying to find a free program for designing circuit diagrams. Is Autodesk's Eagle program any good or is that just for designing PCBs. I've had a look at Microsoft Visio but I don't really want ...
0
votes
2answers
82 views

How to Convert 28V to 12V?

I have to use a 28V DC power supply for a certain design I am doing. But I only need 12V DC to power up this device. How would I design this in a schematic? What would I need? I have been searching up ...
1
vote
2answers
88 views

Does this prototype match the schematic?

I'm following this project which shows how to make an OpenTherm Adapter for an Arduino. It includes this schematic: Along with this simplistic PCB diagram: I am now in the process of making my own ...
0
votes
0answers
40 views

Updating schematic symbol in Altium

I'm trying to learn Altium and would like to know if someone can point me in the right direction here or if it's even possible to do this. So I've created a 20 pin symbol on a .SchLib for an IC and ...
0
votes
0answers
17 views

Building a Shunt Active Power Filiter Using

I am trying to built an experimental setup of a shunt active power filter to validate some Matlab simulations, I am using a SEMITEACH B6U+E1CIF+B6CI. (Here is the datasheet) and picture of the device :...
1
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0answers
29 views

Orcad Schematic Capture. Instances vs Occurrences

Using Orcad capture to create a multi-page hierarchical schematic I used the "Annotate..." option to renumber all parts. First set the them to "?" then incrementally update them. However, after this ...
20
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2answers
4k views

Is it ok to 'snake' the flow of my schematic?

I recently watched this video by EEVblog on drawing schematics. One thing he talked extensively about was that the logical flow of a schematic should flow from left to right. Whilst this makes ...
5
votes
1answer
126 views

How the PCB-A are designed?

I don't know if the question is straightforward. I am not interested in the manufacturing process, soldering, testing, etc. When I am working on a school project, first of all I try my design on a ...
0
votes
1answer
34 views

TPS26601 Industrial eFUSE Circuit Design

I have been designing a circuit for various Power protections like overcurrent, overvoltage, ...
0
votes
1answer
18 views

Analog Devices Filter Wizard Schematic Question

I am using filter wizard to help me design an active multiple feedback bandpass filter. I understand the parts of the schematic that show the stages of the filter, like this: However, I am ...
0
votes
1answer
24 views

On adding components in Eagle schematic same are not reflected on Eagle board else link error pops-up?

While adding new components to Schematic same are not reflected on board. Forward/Backward annotations cannot be performed. How Re-link the schematic and board so that I can add new components? or Can ...
0
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1answer
31 views

Schematics of PIN Photodiode interfacing with an ADC

This question is in continuation of my previous question. I am moving forward with PCB designing now. I have selected low input-bias current op-amp AD8616 for converting current signal into voltage. ...
0
votes
2answers
51 views

Why Gain-Bandwidth Product of devices having a simple one-pole frequency response is constant?

I was reading wikipedia page of Gain-Bandwidth Product and got struck at one particular statement. For devices such as operational amplifiers that are designed to have a simple one-pole frequency ...
0
votes
1answer
58 views

Schematic failure in I2C connection

Hi, I've built the schematic shown in the picture. It is an ESP-12 module that should communicate via I2C to the MPU6050. However, the communication seems to be disturbed. The clock and data line ...
3
votes
0answers
106 views

What is the purpose of this transformer winding in the following SMPS schematic?

I am trying to understand how the following PC switched mode power supply works : The way it works in general is OK. What is not clear to me is what is the purpose of the following part in red : ...
0
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0answers
36 views

I2C line pulled low by MCP23017

A simple interface of MCP23017 with Rpi using I2C lines. Since there is already an internal pull-up resistor of 1.8k on rpi I didn't use any pull-ups n I2C lines. Running ...
0
votes
3answers
107 views

What is this component on circuit schematics? [duplicate]

It's a resistor like coloured 2 pin component from a power supply board of a home theatre, with a glass-transparent aspect. I'm a hobbyist and not into complex circuit till now... looking for an ...
-8
votes
1answer
55 views

Where to find parameters of a component in Altium Designer [closed]

Where can I find the parameters of a selected component in the schematic editor?
1
vote
1answer
93 views

Is there a wrong way to wire a potentiometer?

I'm using Circuit Wizard to simulate a circuit and I'm trying to understand how to wire a potentiometer. While trying to learn how current flows through the pot, I found that it works in both ...
0
votes
2answers
190 views

PCB Reverse engineering in ALTIUM

I have to redo a schematic for a PCB. I have a paper version of the schematic, the Gerber file of the PCB and the PCB in a CADSTAR project but not the schematic. I'm using Altium and wanted to know if ...
0
votes
1answer
47 views

Altium Designer: How can you extract single members of a Harness?

For better readability of the schematics I wanted to do something like in this image(Distributing the I2C-bus): But I get "Conflicting Harness Definition for COM-IF" as a compile error. Am I doing ...
2
votes
1answer
334 views

How can I identify these capacitor values?

I’m trying to build the power supply from this schematic. I’ve been purchasing the parts, but am confused about the capacitors I’ve labeled, especially became their numbers start with “R”. What are ...
0
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2answers
44 views

Passive Component ratings displayed on schematic - Use actual value or design requirement value?

When placing a passive component such as a cap or resistor on schematic, most people usually place the relevant rating (usually power for resistors, voltage for caps, and current for inductors) next ...
0
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0answers
72 views

What does arrow to battery mean?

In the following circuit, the wire connecting Ground to \$ V_{GG}\$ has a arrow pointing at the positive terminal. I have never seen this before. What does it mean?
1
vote
2answers
161 views

What is the purpose of a diode and resistor at the gate of a FET in this LED driver circuit?

I am trying to design a LED driver based the LM3409HV IC. I am using the reference design from TI as a starting point. The schematic in the datasheet has a diode (D2) and a resistor (R5) at the gate ...
14
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2answers
1k views

Ring around wire on diagram

If this is a repeated question, please let me know. I'm a hobbyist electronics person, and ran across symbols on a diagram I didn't recognize. I've attached the image below: What I'm trying to ...
4
votes
1answer
113 views

PCB layout rules

What are the design rules that should be applied when designing a PCB layout ? I am currently using Kicad, because it is free and it is simple to use. I made a layout for a L200 power supply. I wand ...
0
votes
2answers
79 views

KiCad - Bus as input pin to a component

Can a schematic component be created whereby a pin represents a bus (aka multi-bit) signal? For example consider a case where you want to create a component for a 32-bit 16-to-1 multiplexer. Using a ...
-2
votes
1answer
75 views

DC signal output 0-5V with constant 10mA

I am designing a Digital Logic Board and need to add a DC signal output from 0 to 5V (with potentiometer) with a constant 10mA. I have checked designs with LM317 and LM334 for adjustable current upto ...
-1
votes
1answer
138 views

Clock oscillator pin, requirement, ac-decoupling and termination

I'm trying to make something with ADI PLL (ADF4159 and ADF5901). In their datasheet there is nothing about how to source the clock pin. I have found lots of information about clocks on the internet ...
0
votes
2answers
123 views

RS485 transceiver design

I'm working on a TTL to RS485 transceiver which is part of a bigger project (arduino based) and I came up with the following design: I have a few questions: 1) I have seen very different values for ...
2
votes
3answers
171 views

How to wire headphone switch correctly in audio amp (LM4875) circuit?

I'm working on a circuit for a small audio device and I'm a bit confused about the headphone jack wiring, I hope someone can shed me some light. I'm using the LM4875 because I have a speaker and a ...
1
vote
1answer
101 views

KiCAD's eeschema: How to move a reference / value in a schematic?

I would like to arrange a component's reference or value label in a eeschema schematic but I cannot seem to select or move it. If I try to edit the respective field's X and Y position via the "Symbol ...
2
votes
1answer
90 views

Calculating the resistance for the base of a transistor

I'm building a circuit for my little niece's birthday (I'm already overdue with a couple of days). I started building it before I well understood enough about transistors and no I'm running a little ...
1
vote
2answers
37 views

How to represent a variable DC supply potential difference on a circuit diagram

I have a circuit diagram for a physics experiment. On the diagram I have represented a variable DC supply, but I would like to know where do I write the potential difference selected on the variable ...
0
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0answers
49 views

Auto-numbering components in LTspice

I'd like to re-number the components of my LTspice simulation from left to right and top to bottom to make the schematic more presentable. For example, in the circuit below, I'd like R44 to be R1, R50 ...