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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-1
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0answers
41 views

Developing / Documenting schematic / PCB design process. Need a little help [on hold]

So I have recently been tasked with documenting our schematic and PCB procedures as well as the creating a best practices document on how to do things and what they should look like. im having trouble ...
0
votes
1answer
25 views

Altium de-highlighting nets after using 'Find Similar Objects…' command

I can't work out why Altium is doing this, or how to undo it, or how to make it stop doing it. It happens when I use the 'Find Similar Objects... ' option; all of objects that it hasn't found are ...
5
votes
1answer
288 views

What is this schematic symbol representing?

I found this symbol in some datasheet. But I have no idea what is it? Can anyone tell me?
1
vote
1answer
35 views

Making sense of Cadence schematic source files

I'm looking into writing an application to visualize existing cadence (OrCad) projects when provided with the projects design files. I've had a look through the project directories and it looks like ...
2
votes
0answers
31 views

Using a CFL ballast to power 9W UV tubes

I would like to build a low-cost home UV exposure box for PCB manufacturing. Recently my attention was brought to these dirt cheap UV bulbs which are used in manicure drying lamps. I have the ballast ...
1
vote
1answer
73 views

PNP or NPN Transistor for this schematic?

I am quite new to electronics and hoping to build a voltage regulator using the schematic below. I will be using a 7806 regulator and a 7.4 Lipo battery (yes, the schematic is probably a little ...
1
vote
1answer
61 views

Where to find Advanced Schottky TTL Schematics

I am currently having difficulty locating the circuit diagrams/schematics for the Advanced Schottky versions of the 7400 IC series. While the standard TTL data books seem to have depictions of the ...
-3
votes
0answers
25 views

Why cant I find a Force Sensing Resistor part definition in Eagle?

Below I have a schematic that I have used a generic resistor symbol with a label of "'FSR" to identify Force Sensing Resistors. I am used to using a different symbol. Is there a better symbol in ...
4
votes
3answers
291 views

How to choose components for a circuit

I designed a simple circuit: that I would like to put components on - the point of the circuit is to light the LED when the voltage source is above 4 volts (it won't be more than 5), so I am ...
1
vote
1answer
35 views

How to avoid gated clock on a flip-flop?

I've read that it is a bad practice and I should use the enable signal. Is it also a bad idea to connect a gated, divided clock signal to the enable input?
1
vote
1answer
39 views

PCI 164-Pin Design on Altium

I would like to design a PCB having PCI 164-Pin on that shown at image. Is there any component I can add to schematic on Altium or should I just put some I/O ports on schematic?
0
votes
0answers
36 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 ...
1
vote
3answers
258 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.
0
votes
1answer
37 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
votes
1answer
78 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
votes
1answer
56 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
votes
0answers
38 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
votes
0answers
16 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 ...
1
vote
1answer
26 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
vote
1answer
102 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 ...
0
votes
2answers
108 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
votes
2answers
84 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.
1
vote
2answers
183 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
219 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
votes
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
509 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
96 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
votes
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
126 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
131 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
305 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
129 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 ...
1
vote
0answers
85 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.
-1
votes
1answer
47 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
65 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
votes
2answers
112 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 ...
0
votes
0answers
95 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
239 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
98 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
68 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
vote
1answer
63 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
75 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
113 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
93 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
76 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
vote
0answers
54 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
441 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
votes
1answer
60 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
vote
2answers
54 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
89 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.