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.

learn more… | top users | synonyms

0
votes
1answer
69 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
66 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
46 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 ...
1
vote
0answers
22 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
49 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
40 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
74 views

How to modify this schematic for more amps? [on hold]

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
358 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
50 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
50 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
53 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
49 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
421 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
2k 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
votes
1answer
81 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
117 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 ...
3
votes
2answers
88 views

Figuring out transistor function in schematic

I know some digital logic. Here is a simple Full adder schematic. It is easy to understand the digital part but i don't understand the logic of adding transistor on the sum output? What is the purpose ...
0
votes
0answers
44 views

Over 100 pins ic packages in Eagle [duplicate]

I want to use Eagle or Kicad to design a board using Maxim chips MAXQ1103 and MAX32550 http://datasheets.maximintegrated.com/en/ds/MAXQ1103.pdf and ...
1
vote
1answer
31 views

Altium, how to add 74HC165 in schematic

I want to add a 74HC165 in schematic using Altium. But I'm unable to find 74HC165. Do I have to create own library for it ?
2
votes
1answer
55 views

Modding a Fender princeston chorus, having issues reading this part of the schematic

I am trying to add some wires for the left or right channel of this fender amp, and having trouble understanding the schematic here: There are 2 1/4" phono jacks on the front that are input no 1 ...
2
votes
1answer
101 views

Why would an audio circuit output through two caps like this?

I'm studying a circuit that is based on a clone of the Apple Mockingboard from way back when. Being new to EE, the first thing that struck me as odd is why the ...
6
votes
3answers
451 views

Decoupling caps in circuit schematics difference

I want to ask if there is differences between this two circuits: I ask this questions becouse in different schematics like this: There is two decoupling cap of 0,1uF, it's a mistake or are ...
1
vote
3answers
334 views

What is the purpose of a resistor on the non-inverting terminal of an Op-Amp Integrator? [duplicate]

I have seen this type of circuit design a few times, but am not sure why it is needed. Considering the schematic below, what is the purpose of resistor R3?
0
votes
1answer
49 views

20VDC LED Illumination

I'm looking to build a simple test circuit, where I can get an LED to illuminate when it senses 20VDC or above, and to remain off if it is sensing any less.
3
votes
1answer
94 views

Are there conventions for representing hierarchical components on a schematic?

Say I'm designing a device with a lot of repeated elements, like an 8-channel audio mixer. Each channel will have functional units that are identical and repeated, for example, an amplifier. To keep ...
0
votes
1answer
49 views

xilinx create schematic of top modul with lower level moduls

I have a top modul VHDL source file, which has a few instances of lower-level modules (VHDL) and signals which connects these lower-level modules. How can I generate a schematic for this? I mean, I ...
6
votes
5answers
765 views

Does “Connected” mean solder together?

Looking here, I am shown that the connecting symbol, means the wires are, literally "connected" as shown below. I am currently working on trying to decipher an FM Radio schematic, but am having ...
0
votes
1answer
55 views

how to change the structure of the schemetic components in altium designer

I downloaded a library for microchip PIC18F in altium designer. The schematic component for PIC18F2455 is show in the figure (left). But what I want is the component looks like - right part of the ...
2
votes
1answer
74 views

Help with schematic

I made a schematic with an ATmega328, a LT1763, and a HC-05 module. I was wondering if I made any mistakes on the schematic. It also has a 4 pin female header for a MPU-6050 module. It might end up ...
2
votes
4answers
211 views

PCB Layout, Functional vs Actual Pin Order

I'd like to continue this conversation here: CAD Schematic pin arrangement approach Basically, there are 2 major ways to do schematic symbols, either with true pin order or by grouping pins by their ...
0
votes
2answers
53 views

Soldering my own CUL sender/receiver

I have been thinking of starting a new home project: I want to automatize some stuff at my home, starting with the heating. To do this I looked at the FHEM project. All looks pretty good and ...
0
votes
1answer
103 views

What is the purpose of the thick blue line in this schematic?

On this schematic for a Z80 computer, there appears to be a thick blue wire connecting some components together. What is it? Googling yields no results: here is the schematic
3
votes
1answer
122 views

RS232 to 1-Wire interface - need help understanding the schematic

There are plenty of projects on RS232 to 1-Wire, each one of them is almost the same, but none of the sources really explain the wiring. Let's take this one: ...
1
vote
0answers
134 views

Inverse engineering time

I got this circuit from an automatic lightbulb sensor , it basically turns on whenever the IR sesnsor detects movement, I was able to reverse engineer the entire circuit, however this clever bastards ...
4
votes
1answer
115 views

How does this DC/DC converter work

I've got my hands on a bunch of old garden lights with solar panels, and of course I disassembled them and found that they use just one 1.5V accumulator cell to light up the LED. Just for ...
0
votes
2answers
75 views

How does this wireless charger work?

I want to understand the way this circuit works. The following are diagrams of the transmitter and receiver of a wireless iPod charging circuit. I have added a link to the instructable that describes ...
0
votes
4answers
61 views

-12v Regulator selection & conversion

I need help in selecting proper Regulator for regulator IC for exiting hall effect sensor.Sensor exitation voltgae is +12 to -12 v . Usually i use 7812 1A for exite +12v , I would like to know is ...
1
vote
1answer
153 views

What does this microcontroller notation mean?

Referring to this schematic, what do the little white circles with red lines mean in the pin out diagram?
0
votes
4answers
99 views

Circuit Validity

The following is a circuit I have tried simulating on multisim. The LED on the transmitter part does not light up. The current is 0 through that LED. Is it legitimate?
2
votes
2answers
144 views

Opto coupler schematic

I am analyzing following circuit, but I am not getting its flow. In the following schematic SW1 is coming from controller and connected to opto coupler ( cathode of LED ) and J4B is connected to ...
1
vote
0answers
65 views

Problems with Infrared circuit on a PCB - Is it the board or schematic?

I am using the toner transfer method to apply my circuit for 6 sets of infrared emitters and collectors connected to an RJ15 cable on a PCB for use with a Raspberry Pi B+ board (connected via IDE ...
0
votes
1answer
70 views

Whats the difference between these three breakout boards for the ADXL345 Accelerometer?

I would like to use the ADXL345 in a schematic im working on right now, but as there is no typical/minimal circuit provided within the datasheet i got stuck. I did a bit of research and found three ...
2
votes
1answer
158 views

What is the need for the extra resistors in this equalizer circuit?

I am working on a final project for my circuits class to design an audio amplifier. We are creating an equalizer circuit that has passive high pass, low pass, and band pass filters. Every where I ...
0
votes
1answer
95 views

Difference between an inverter and a buffer with active low input

In logic diagrams found in datasheets (e.g. Texas Instruments 74HC316) I've often seen both inverters and buffers with active-low inputs ("negated buffers" or "inverting buffers" or whatever they are ...
1
vote
3answers
125 views

Schematic & pin reduction

I am using arduino Uno for developing my project. There are totally 24 analog hall sensor out put,1 temprature ananlog output, 1 Rshunt voltgae measurement. There are totally 26 Analog sensor.I am ...
0
votes
4answers
142 views

Automation schematic software for linux

Is anyone aware of a good linux program for drawing automation schematics? Not PCB design, circuit simulation and fine electronics. Industrial automation. Example: I looked at a couple of different ...
2
votes
1answer
152 views

Identifying a component symbol in a schematic [duplicate]

Problem: So I have ran across the following part and I simply don't know what it is. I tried searching for if you will a description of it. (I.E. two diodes on top of each other pointing opposite ...
1
vote
2answers
132 views

How reliable or trustworthy are LTSPICE demo circuits?

I'm looking at a few switching power supplies and one of the demo .asc files for the particular controller I was looking at really seems to fit my requirements. Can I use their schematics in designs ...
0
votes
0answers
86 views

Applying euler path to CMOS schematic with inverter

I've discovered that tracing the Euler path of a CMOS schematic can aid in creating compact stick diagrams. I have an issue, though. Of all the lectures I've read on the net, the pull-up and ...
4
votes
3answers
497 views

Simplifying CMOS schematic to reduce number of transistors

I know the basics in creating a schematic in CMOS, wherein in a(n inverted) boolean expression, if there is a: NOR - NMOS should be in parallel, PMOS in series; NAND - NMOS in series, PMOS in ...