Tagged Questions

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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0
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1answer
23 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
1answer
47 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
114 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
93 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
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0answers
32 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 ...
2
votes
1answer
86 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
50 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
57 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
93 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
110 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 ...
0
votes
0answers
41 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
77 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
91 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
47 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
56 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
237 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
56 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 ...
0
votes
1answer
76 views

What is this SB component on schematics

Is the SB19 component a "jumper" (0-Ohm resistor)? On the board itself, some of these are placed, and some aren't, leading me to believe that's what they are. There aren't any 0's on them, though. ...
0
votes
1answer
85 views

Determining Voltage and DC/AC from Wiring Diagram for Spark Door Buzzer

I'm looking to use my Spark Core to control my door buzzer in my apartment. I'd like to identify the correct parts I need to build the required circuit, but this seems to be dependent on the voltage ...
4
votes
2answers
153 views

What are the use of these diodes?

I have a circuit diagram which is for a circuit used for testing batteries under a load, only one of the batteries can be tested at a time and I was just wondering what the point of the diodes in the ...
0
votes
0answers
30 views

Multisim database BOM report problems; alternatives?

For example, we use four parts that are all .1uF 50V capacitors, all with different footprints. They’re electrically the same, so we’d want them to show up on the schematic as “.1uF 50V”. That means ...
1
vote
1answer
35 views

Make a pad connect to two nets with different names in Eagle

I have a part that is an SMT 'jumper', it is unpopulated and you use it by bridging the pads with solder. I want to put a track from the pin pad to GND. But the pad pin needs to also go to an address ...
0
votes
1answer
80 views

Adding diodes to easy driver stepper motor driver

I had an easy motor driver damaged by removing the motor while the drive was energized. I sent an email to Brian Shmalz to see if there was anything that could be done to protect the board in these ...
0
votes
2answers
88 views

Schematic Design and Non-PCB Mounted Components

I am working on a bipolar power supply for hobby and educational purposes. Concerning the schematic, is it possible/good practice to place devices that don't go on the PCB in the schematic? ...
1
vote
2answers
111 views

Can any one say which Schematic Software is used for this Circuit diagram

Can any one say which Schematic Software is used for this circuit diagram. I know Eagle and Pspice
-1
votes
1answer
86 views

808 bass drum schematic : explanation

I am curious about this schematic (I would develop a project around this machine) I was trying to understand how this bass drum work, but sounds complicated for me... The trigger input is a pulse. ...
6
votes
4answers
770 views

Schematics vs PCB designs

I've heard the terms schematics and PCB designs used interchangeably as well as used distinctively. Are these one in the same, or do they represent to different sets of blueprints? If the latter, what ...
1
vote
3answers
129 views

What type of Op Amp or comparator has a schematic symbol with hysteresis like symbol

I already know it is not a schmitt trigger, it looks like it is used as an open loop amplifier taking a reference voltage on the (+) and the V0 is fed into a schmitt trigger. I have no other data. ...
0
votes
2answers
115 views

Wiring Harness Software

Is there any software or method out there that makes laying out a wiring harnesses easier? I can draw a wiring harness out in just about anything, but mapping all the wires, colors, lengths and ...
2
votes
3answers
517 views

What does the T symbol signify in electrical diagrams?

I'm trying to connect to my atmega1284rfr2 using the basic application circuit in their datasheet. The red lines and letters are my own annotations. I'm having trouble understanding what all the ...
4
votes
4answers
237 views

How to deal with devices connected via a connectors in schematics?

I have a few sensors (potoresistor, temp sensor...) that connect to the board indirectly. The PCB will have a connector such as the molex 4pin fan connector that will in turn connect to the ...
0
votes
1answer
82 views

Orcad to Kicad schematic

I am looking into a reference design which was probably done using Orcad. I am using KiCAD for my design. In the reference design, there are schematic symbols like >> and <<. According to this ...
2
votes
1answer
124 views

Which software is used for producing those schematic sketch? [closed]

It's a while that in the internet I'm finding schematics with hand-made pencil drawing style. I've tried to search a little bit for the software used to make them but I didn't find it. Any advice? ...
2
votes
1answer
95 views

Resistor values on schematic

I'm at best a hobbyist EE and could use some help reading a schematic. I'm trying to test a chip (TI BQ76920) I found that will read the voltages from a multiple cell (1-5 cells in series) Lipo ...
1
vote
0answers
96 views

How to specify a capacitor in Altium schematic as DNP

I am working on a prototype of a project and it involves an antenna. This means that I will probably have to tune this first version a little bit once I get it assembled. To do this, I wanted to place ...
1
vote
2answers
377 views

Powering SIM 900 gsm

I bought a sim900 (the chip itself, not a module) and have gotten stuck trying to figure out how to power it. I hope to power it using a pin from my RBBB arduino clone, which outputs 5 volts and ...
3
votes
4answers
162 views

How to read this basic schematic?

I need to build a circuit where light is converted to sound. The light falls on a CDS cell and the current is passed through the NPN transistor to amplify it. I know this is a very simple ...
4
votes
1answer
180 views

What purpose does the capacitor serve in this schematic?

I'm looking at this schematic someone did for daisy chaining a set of 74HC595's and I wanted to know why there is a capacitor put on the pin4/latch and the GND. What purpose does it serve and why is ...
1
vote
1answer
28 views

STK4192II pinout?

I have been blowing through bandwidth trying to find a pinout diagram of an old STK4192II stereo amp IC but all I can find are reference design schematics, while these will work I guess I want to use ...
0
votes
0answers
73 views

PCB to schematic

Is there a software package out there that will allow you to layout a board and "populate" it and then render a schematic from that board? I have a few power supplies to fix and no documentation on ...
-2
votes
1answer
101 views

Why so many capacitors in design?

I was looking the schematic for programming a standalone AVR chip. I am curious why we need so many capacitors. As far as i know, i know we need one capacitor on the power supply. I don't remember ...
4
votes
3answers
108 views

How to correctly connect audio plug to LM386?

I'm working on my first circuit which includes LM386 chip and some music. Since I don't have a lot of experience with electronics I need a little help with audio plug. It's the same as that: I know ...
2
votes
3answers
577 views

What is this AC source?

Below is a part of a schematic and I would like to understand each part of it. What I think is happening: This is being fed a 48V AC source These leads are a source and a ground? I'm not sure ...
0
votes
2answers
72 views

Connecting jumper to input pin

I am designing an active high function in my MCU program and I need a jumper to activate/deactivate the function by placing it between Vcc and one input pin of the MCU. I have came up with two ...
1
vote
2answers
107 views

Draw circuit diagrams with custom shapes? [duplicate]

I want all the benefits of dedicated schematic drawing software but I often don't like the way the diagrams actually look. I know it sounds trivial, but I find it easier to read nicely hand drawn ...
0
votes
3answers
95 views

How to determine wattages on an applications note schematic?

Specifically, I refer to Fig 18 on Page 14 of this datasheet for dual supplies. Really nice, really "simple" to use 2x40W power amp I want to try out. Unfortunately, I'm a newbie and their schematic ...
1
vote
3answers
137 views

“Not mounted” - Meaning on a schematic

I was looking at the schematic of the LPCXPRESSO LPC1769 board from NXP and I couldn't figure out what they meant by "not mounted" which appears on the left corner of the following picture. Here's a ...
1
vote
3answers
135 views

How to deal with grounding and the capacitors in this opamp schematic?

Here is a schematic I'm planning to make (right click on the image and 'open image in new tab' to see it better'): I have a transformer and AC to DC converter that makes +/-12V. (1) Does 'power ...
0
votes
2answers
391 views

How to replace this NPN transistor with a MOSFET?

Here is the schematic of the circuit I'm trying to build (source) but I only have an IRF9530N Mosfet; I don't have any NPN transistors at hand. What would the schematic look like with a MOSFET ...