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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2
votes
1answer
57 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
1answer
37 views

Over 100 pins ic packages in Eagle

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
23 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
44 views

how to make power voltage and current and power factor measuring digital meter for single phase motor of 230v [on hold]

I want to use current transformer for measuring current and voltage divider for measuring voltage. I dont know from where to start. I am using advanced microcontroller TIVA C (TM4C1294) for project. ...
2
votes
1answer
51 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 ...
1
vote
1answer
92 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
0answers
64 views

What's your electronics design question? Be specific [duplicate]

What are difference in this two circuits? We can find decoupling caps and a filter. Since filter should be of 88Khz and decoupling capacitors change it's value. It's correct to put filter after ...
5
votes
3answers
439 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
298 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
47 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
85 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
42 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 ...
0
votes
0answers
78 views

Light LED when 2 others are disconnected [migrated]

I need to make circuit in which orange LED will light only when yellow and red are disconnected. When one of buttons is pushed orange LED should turn off. See my attempt at it below. I am new to ...
6
votes
5answers
751 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
45 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
72 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
203 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
48 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
96 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
103 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
131 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
111 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
69 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
58 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
149 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
136 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
62 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
51 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
147 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
70 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 ...
0
votes
3answers
103 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
3answers
99 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
147 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
114 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
75 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
355 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 ...
0
votes
1answer
56 views

PIN selecting problem over arduino

My schematic as below. I have connected 8 hall sensor as shown in picture. Problem i am facing here is SO, s1, s2 The Led light are not glowing .Even the forard voltage across is 3.9v. i have tested ...
1
vote
1answer
87 views

Wiring an IC for VGA switcher

Original schematic: Here is the goal switch between two VGA outputs from one source VGA input. Parts list: 1 SPDT switch for switching between A or B video outputs. 2 CBT3244AD IC chips (here's ...
12
votes
5answers
1k views

Meaning of crossed wires in schematic

I am reading a datasheet of a motor and I keep seeing wires crossing each other and crossing them again. (see the picture below). Does anyone know what this means? EDIT: I also see this picture in ...
0
votes
2answers
148 views

Bench power supply adaptation 13.8V min to 12V [closed]

I have a bench power supply, which gives a minimum of 13.8V with 20A. There is something to do for adapting this scheme to give a minimum voltage of 12V? The scheme is this one ...
2
votes
1answer
116 views

Could I get some feedback on my circuit?

As someone who holds an engineering degree but is sort of new to circuit design/ electronics, I'm probably not aware of the many conventions and techniques that a more experienced circuit designer ...
7
votes
1answer
797 views

What is the component on the schematic indicated by the symbol of a diagonal rectangle with a line through it?

I can't for the life of me, figure out what these diagonal rectangles are... Help?
0
votes
0answers
68 views

Merging / Concatenating Buses in Altium Designer

In Altium Designer 14.3 I am trying to merge two 16bit buses into a 32bit bus with one of the input buses becoming the lower 16 bits and the other the upper 16bits of the output bus. Below is an image ...
0
votes
1answer
89 views

OP amp output not changing ( schematics )

This is a image of most of part of my circuit (555 timer IC is cut from right side)... using the pot (RV1) , I change the non inverting input voltages of the op amps. when non inverting exceeds ...
0
votes
2answers
192 views

How do I read this relay pinout/schematic?

I'm trying to understand the way this relay works. To me it looks like this KUHP-11DT1-12 is a DPDT relay. Pin 7 is connected to 1 or 4 and pin 9 is connected to 3 or 6 depending on whether the coil ...
1
vote
1answer
77 views

Delete or ignore I/O from a schematic block in Lattice?

I am programming with a Lattice ispMACH 4000ZE Pico DevKit and with the software ispLEVER Classic Project Navigator. I want to use in my schematic file the OSCTIMER block from the Lattice library, but ...
0
votes
1answer
73 views

How to explicitly connect hidden pins in eagle?

I am working on a project where I used a shift register 74HC595N which has hidden GND and VCC pins in Eagle. So I used the invoke property as shown in the pics, and connected the VCC and GND to the ...
2
votes
2answers
275 views

Schematic symbols: dot or bar to indicate negative logic

A question of style or consistency: considering below schematic symbol which notation to indicate a pin with inverted logic is preferred: Dot and bar above pin label (possible double-negation?!) Dot ...
0
votes
1answer
78 views

How to make valid harness port when generate sub-sheet from vhdl

I have an VHDL file (a block) with huge count of the different port that can't combined into the one bus because they have different names. These signals will be further connected to different parts ...