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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29 views

Using PNP 2N3906 to signal GPIO LOW when negative pulse is detected

http://www.savagecircuits.com/attachment.php?s=04cc498cb970ec62cdb517a60346c629&attachmentid=290&d=1430452949) In the attached schematic +5v input is turned into GPIO Low while 0v input is ...
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3answers
222 views

What does this symbol mean?

What does this schematics symbol mean? Taken from here. I got the PCB and it's not a button.
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1answer
33 views

problem on connecting devices in eagle

i'm still a biginner in using eagle .... well everything is almost fine but i keep having this error .... although i cheked a 100 time Only INPUT pins on net 25 Only INPUT pins on net RXCAN ...
0
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1answer
48 views

What happens to the output of Optocoupler input voltage is negative

Here is an example of circuit using VIshay Optocoupler 4N25 5V to 3.3V GPIO Output (Inverted) Logic +5V Input ---> 0.0V output GPIO LOW +0V Input ---> 3.3V output GPIO High What happens to ...
0
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1answer
41 views

What is this M01PTH I see referenced on schematics?

What is this part "M01PTH"? I'm interested in building this "BBQ Temp Controller" Arduino-based project here: http://hruska.us/tempmon/ One component involved is a 12v blower. In looking at the ...
0
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0answers
36 views

How do I create GPIO outputs from circuit to connect to Arduino Micro

how do i design the GPIO outputs so i can connect it to two pins on my Arduino and get the readings. ie. if green didoe is on GPIO 1 = High, other wise Low if red diode is on GPIO 2 = High, ...
0
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0answers
13 views

Unexpected error after Arduino Uo schematic upload to Eagle

I wanted to learn a little bit in board schematic analyze/modification. I am learning Eagle so I've downloaded Arduino Uno official files and the error appears: I've already done 2 or 3 basic boards ...
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1answer
23 views

Is it possible to edit gerber file using allegro?

I want make some corrections in gerber file. Is it possible using allegro? Or is any other better method to do it?
1
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1answer
90 views

What does the series of circles in a schematic mean?

I saw this series of 4 circles in the schematic of an Arduino board. Similar circles appear in other Arduino schematics, though I don't think they are Arduino specific (which is why I post here ...
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0answers
24 views

two PCIe x1 interonnection

I am drawing schematics to connect the PCIe x1 edge connector of a picozed carrier card and the PCIe x1 of an SBC. I am new to this and have a very basic question. I have attached the pinouts of both ...
0
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2answers
90 views

Dual rail switching PSU critique

I am looking for feed back on the following power supply design. This power supply is intended to have 2 outputs: 24V @ 500mA and 32V @ 850mA. When the power supply is in standby, J1 pin 1 is @ 0V, ...
-1
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1answer
53 views

How to view SchDoc files online?

I have a file witch was designed with "Altium Designer". How could i view this file without needing to install "Altium Designer"? it is preferred to do this with an online app.
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2answers
169 views

Schematics: Effect factor and impedance

I have a questions regarding a simple schematic. I would like to calculate the total angle (φ) and power factor (cos φ) of this circuit and the total impedance (Z). -- Not using the complex-method ...
3
votes
2answers
210 views

The usage of chip topography and diagram(schematic)?

Are you an EE? Do you use TI Op-Amps? then you should know the answer of this question. probably that could be interesting for us. If you take a look at the datasheet of TI(or a few other companies) ...
0
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4answers
107 views

Optimize PNP/Diode Schematic

I am trying to design a circuit which has four switches, numbered 1-4 as in the diagram. The circuit should function such that closing switch n turns on light ...
5
votes
2answers
491 views

What does it mean when components in schematics do not connect?

I'm fairly new to the whole Arduino world, and I'm just really curious about this schematic that I came across... I can read the basics of a schematic, but this one has me puzzled. What are the ...
0
votes
2answers
76 views

How should I connect / design this tactile push button on PCB & schematic?

I have need for a tactile push button that I am using to cause an interrupt on a microcontroller. I have found my desired switch (linked above) but I am having trouble deciding the best way to design ...
0
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0answers
45 views

Drawing Schematics for different boards

I am an entry level electronics engineer. I have been assigned a task to start off with drawing schematics for the connection of these boards: Picozed Zynq module + SBC + Gimbal + Power Supply using ...
0
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0answers
34 views

New guy on the block…first project

So I am building boom box out of an ammo can. I want the ability to be able to use external power or battery power, with the option of using a switch to go from one or the other. When on external ...
2
votes
1answer
93 views

How can I reset all part names in Eagle PCB?

I've built a large PCB, which merges about 17 schematics. There are about 1000 components on the board. What I need to do now is rename all of the resistors and capacitors. Currently the parts are ...
3
votes
1answer
130 views

Unable to identify the symbol in schematic

In my job I came across reading a customer schematic. I am facing trouble in identifying the marked part of the schematic, which is connected at the pins of uUSB ...
3
votes
2answers
288 views

Finding the schematic of a black box with unknown impedances

I'm struggling with trying to understand a piece of homework in Electrical Engineering that I'm really trying to solve on my own but now I'm basically stuck. The assignment is to find the schematic ...
4
votes
1answer
126 views

Help understanding circuit in Forrest Mims' Getting Started in Electronics

I've worked through Forrest Mims' Getting Started in Electronics, but cannot figure out why the below circuit (on page 92 in the fourth edition) claims that LED1 and LED2 alternate in being lit ...
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0answers
66 views

What is the IEC 60617 schematic symbol for jumper and test point?

What is the IEC 60617 schematic symbol for jumper and test point? I have tried to find it in the official standards but it seems not to be defined explicitly.
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1answer
45 views

Identify this 2xNPN AC-coupled preamplifier circuit

My workmate has this nifty little EMI-detecting wand he built back in 2000. It senses EMI fields using an approx. 200 turn air-core coil, and converts them to audio signal. He uses it to detect e.g. ...
2
votes
1answer
64 views

Inductors with no value on schematic

I'm reviewing a schematic so that I can replicate it and I've come across several labeled inductors with no values. From my Googling, It seems that these may actually be ferrite beads. My question is, ...
0
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2answers
100 views

Bench power supply “Issues that rouse during build”

I'm building a power supply, based on this instructable and this one I am using 24volts DC power supply, 7+ amps circuit is based on LM338 / 7805 / 7812 Circuit is working although few things ...
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0answers
89 views

Schematic design critique

I designed a schematic for my project and I'd be thankful if you could give me any feedback on it. I'm specially looking for anything wrong or inefficient with my circuit. The purpose of this ...
0
votes
1answer
154 views

Power on reset circuit for microcontrollers

In this schematic, there is a reset circuit with two pushbuttons: The button marked "warm reset" sends an active low signal to one microcontroller, while the button marked "cold reset" sends a ...
0
votes
1answer
70 views

Orcad DRC Error

I am new to Orcad Cadence 16.5 Schematics. i drawn a schematics and while running DRC, the following error repeatedly occurs for all Components. Please help me to eradicate the below errors: ...
0
votes
1answer
63 views

Learning Schematics

I'm trying to learn to read apple schematics and I have a few question regarding components and lines. I have circled areas of the image below and numbered them according to the question I'll ask. In ...
1
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1answer
51 views

Unshown compile error in Altium Designer 13.1

I have a schematic sheet in Altium Designer 13.1 and I made an unconnected label on purpose. (In the red rectangle) My problem is: when I compile this sheet, there is no error shown in the ...
0
votes
1answer
69 views

Schematic shows some resistor values as DNE

What does it mean on a schematic when some resistor values are listed as DNE?
2
votes
1answer
98 views

LM2907 schematic critique

I have been working with the LM2907 as I have been designing a few circuits around it. This has lead to me wanting to understand more of its inner workings and build up a breadboard model of the ...
0
votes
1answer
80 views

What does this symbol represent?

I am trying to understand the internal circuit schematic of the LM565 phase locked loop IC, on page 6 of this datasheet: PDF Datasheet for LM565 from TI website In the upper middle, there is a ...
3
votes
2answers
72 views

What's these symbols style name/source?

I've found a lot of schematic diagrams that use this style of symbols, specially in the Wikipedia. I think these symbols are pretty clear and stylish. I would love to use them for the schematics I ...
1
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0answers
52 views

Why does this seem like a strange way of connecting a bridge circuit to the ADC?

I was planning to hook up a quarter bridge circuit to the AD7730LBR Analogue to Digital Converter that I bought. I was having a look at a "Load_Cell_Schematic" provided by this webpage (the download ...
2
votes
1answer
237 views

Updating Schematic Component/Footprint in Altium Designer 15.0

I am building a library for Altium Designer version 15.0 and have a schematic component as well as a PCB footprint. The footprint is linked to the schematic through the dialog opened when I ...
0
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1answer
59 views

PCB software and companies that make [closed]

I am looking for a free software tool to make PCB for my circuit and submit it to a company to make it. My circuit components include surface mount devices and antennas. Any suggestions.
1
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2answers
52 views

How should I design a schematic component for a component library?

This is my first time making schematic components, of which I will then be making the footprints for PCB designs. I'm using KiCad. I don't know the best "layout" for the components I'm making. For ...
-3
votes
1answer
88 views

How to modify this schematic for more amps? [closed]

How can this schematic be altered for more amps and to match my transformer? The transformer I am using outputs 21-0-21 volts ,4amps.
3
votes
3answers
417 views

How to read Slide Switch schematics?

I can't understand the schematics of the 20pin slide switch SS44D04. The schematics are in this pdf: http://www.lightcountry.com/download/slide/Slide%20Switch%20SS%20Series-11.pdf It is the first ...
0
votes
1answer
140 views

STM32F411 Nucleo board - what the ferrite bead is used for?

I'm trying to design my own pcb for the stm32f411 and when i saw the datasheet of the stm32f411 ( http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00115249.pdf ) ...
0
votes
1answer
101 views

Connecting SSR relay

I bought a cheap SSR relay (SSR-40DA) on ebay and like to connect it directly to arduino, Schematic on website (http://www.fotek.com.hk/solid/SSR-1.htm) shows that LEDs already have resistors in the ...
0
votes
0answers
104 views

Band-pass filter time step too small error in Proteus

I'm trying band pass filter circuit and having this error . here is the circuit diagram & the schematic file Sallen key. U3(+IN) & U3(-IN) = 50mv sinusoidal with some phase difference. ...
0
votes
2answers
139 views

How do I overlap wires in OrCAD capture without having the two wires have a node?

I'm doing a schematic for this in OrCAD capture CIS. In laying out my schematic I need to draw one wire going through another wire, but not necessarily intersecting with it via a node. When I drag a ...
5
votes
5answers
437 views

Can someone check over my schematic?

This is the first schematic I have made that was not a simple LED. I want to know if it seems good before I go and build it (and buy the parts). Here is the schematic: Here are a few of my ...
34
votes
6answers
1k views

How do you document your hardware design decisions?

How do you document your hardware decisions in the design phase? How do you avoid having to ask yourself the following questions while reviewing an hardware design that you made in the past: Why did ...
0
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1answer
86 views

How does this capacitor discharge?

I have this schematics here Does anyone know how the capacitor in the black circle (disregard the blue circles) can discharge once it is charged up and the power has been disconnected. It is ...
2
votes
3answers
124 views

Resistors in paralel on pcb schematics?

I know that capacitors in parallel are used for filtering, but what could possibly a resistor in parallel be used for? Take for example the schematics I pinned to this post ...