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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1answer
66 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
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2answers
60 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
42 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
49 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
221 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
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1answer
51 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
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1answer
69 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
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1answer
71 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
149 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
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0answers
26 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
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1answer
31 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
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1answer
70 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 ...
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2answers
80 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? ...
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2answers
107 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
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votes
1answer
69 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
744 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 ...
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3answers
119 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
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2answers
82 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
482 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 ...
0
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2answers
64 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
65 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
112 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
88 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 ...
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0answers
74 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 ...
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vote
2answers
244 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
156 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
174 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
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1answer
26 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
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0answers
71 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
100 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
93 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
574 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
66 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
87 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
94 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
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3answers
133 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
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3answers
121 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
293 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 ...
0
votes
1answer
106 views

Numitron clock project

I originally was looking into a Nixie clock. I'm scaling back a little and going to try a Numitron clock first. It lacks the high voltage :) Hows this look for a Numitron clock? The solenoids are ...
0
votes
1answer
88 views

Altium schematic rectangle color?

I'm learning Altium at job. Just curious what is the difference between the yellow rectangle and the white ones on the schematic symbols?
2
votes
1answer
98 views

What does the number of parallel lines in a relay symbol imply?

Some relay cores are represented by two parallel lines and others by three. Does the number of parallel lines have any significance? Saw this symbol in Tiny cad. What does three parallel lines in ...
1
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1answer
78 views

Datasheet of an unknown IC

When reading the Platinum Resistance Thermometer Manual, I was faced with this unknown IC (see pp. 38 from the manual): I searched the web with the following keywords: ...
0
votes
2answers
478 views

Help with Piezo conditioning circuit schematic

I have the below schematic that uses a piezo sensor as input and relays that information to an Arduino board for processing. The schematic came from a few folks over at MIT that built a ping pong ...
0
votes
1answer
103 views

Schematics: where do I need to place a junction?

I'm a bit confused about where I need to place a junction on the schematic, and where I don't. For example: When I connect a part, like a resistor or cap, to a wire, do I need to add a junction ...
4
votes
2answers
294 views

My first project, looking for a review and comments

This is my first project. I haven't built it, just laid out the circuits for it. I'd like someone with more experience than me to look things over and give me any advice, suggestions or comments. The ...
0
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1answer
59 views

3 Pin IR Reciever Schematic

I have been looking for this on google and couldn't find it, what does the schematic look like for a 3 pin IR reciever (ground, +5v, out)?
7
votes
2answers
690 views

What does this Mosfet Symbol mean (two diodes facing each other at Vgs)?

The title says it all: What does this Mosfet Symbol mean (two diodes facing each other at Vgs)? I know its an N-MOS, but I don't understand the meaning/purpose of the two diodes. Part: AO7404 ...
2
votes
1answer
76 views

Pin order differs in reality for my chip

I bought a DS3232MZ+, and I noticed that in the datasheet, the pins schematic looks like this: However, when I received my chip, I noticed that in reality it looks like this: Usually I tell ...
1
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2answers
51 views

How do I measure time delay from power ON to console messages

I am working on Microzed board (schematic is here). User guide is here I want to measure time elapsed right from Power ON to first message that comes on the console. The message on cosole comes ...
0
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3answers
148 views

Schematic editor capable of diagonal components

I've found several great editors capable of vertical and horizontal components, but none that can do diagonal ones. Are there any available? Edit - This is purely cosmetic. I've just started an ...