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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-6
votes
0answers
40 views

Neuron Circuit schematic [on hold]

How could I make one 'neuron' in electrical components and what should be the values of these components. Also how do I 'power' them. ex. give tiny electrical pulses or a continues 5v for example? ...
1
vote
0answers
29 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
0answers
34 views

Electric schematics for acer laptop battery as10d61 and i2c protocol specification

I already know that it has GNG, +11.1v, i2c (smbus), and temp sensor, pin to enable charge more (by 1kom resitor to GND) I know that i2c pins must have same high resistance comparing to other pins. ...
-1
votes
1answer
42 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
53 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
74 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
79 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
66 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
34 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
53 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
39 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
65 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
68 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
70 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
68 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
50 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
55 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
55 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
45 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
83 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
376 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
86 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
67 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
61 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
72 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
429 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
84 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
120 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
89 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
45 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
38 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
58 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
106 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
461 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
368 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
50 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
98 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
55 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
779 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
62 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
77 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
217 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
59 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
105 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
141 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
136 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
119 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
90 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
63 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 ...