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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2answers
65 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
114 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
144 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 ...
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1answer
22 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
55 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
90 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 ...
3
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3answers
59 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
557 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 ...
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2answers
47 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 ...
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2answers
59 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
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3answers
88 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 ...
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0answers
19 views

Raspberry Pi Compute Module schematics [migrated]

I want to create a massive electrical switchboard PCB (24x 230V relays) with individual current and voltage monitoring using a RPi Compute Module as controller and the GPIO banks for controlling. ...
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3answers
123 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 ...
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3answers
98 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
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2answers
146 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
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1answer
77 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 ...
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1answer
70 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
87 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 ...
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1answer
68 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
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2answers
244 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 ...
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1answer
76 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
280 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
51 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
521 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
75 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 ...
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2answers
48 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 ...
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3answers
113 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 ...
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1answer
223 views

Is there a standard symbol for a pressure sensor?

I am using Eagle to design a PCB that includes an analog pressure sensor. However, I can't seem to find if there is any standard symbol for the device. There isn't anything on the datasheet. I began ...
1
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1answer
119 views

Variable capacitor notation with a division sign (e.g. 2÷10p)

In this schematic, there is an unfamiliar notation for the variable capacitors using and division sign or obelus, for example 2÷10p (red), as opposed to, e.g. 1p for a fixed capacitor (green). I ...
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0answers
35 views

How to increase component thickness in tinycad?

I drew this circuit using tinycad. Is there any option to increase thickness of each component to improve its visibility.
2
votes
1answer
78 views

How to create tag type of label in Cad Eagle? [duplicate]

I can't get my copy of cad eagle to create tag type of label for a wire or a net. Instead I get simple text type of label. GND label is what I am trying to get. I have tried turning xref on and ...
0
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2answers
98 views

BCD Up-Counter Schematic Error

When I try to simulate my schematic for my up counter, i get the error Net "Net-name" cannot be connected both to an input port and an instance output pin. Here is my schematic I am pretty sure ...
0
votes
1answer
109 views

How these circuit diagrams in the datasheet was made? [closed]

I've seen so many IC datasheets, and so appreciate the elegant reference circuit diagrams they've made. I'm not meaning the 'function' of the circuit, but the 'beautiful' schematics itself, such as ...
1
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1answer
240 views

Where is Cadence's Allegro Design Entry HDL 16.5 Snap o Grid Option?

I am looking for the snap to grid option? Any idea how to enable it? I did try looking on Cadence forums and documentations, but I did not find anything. Also any idea how I can move ...
1
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1answer
385 views

What is the symbol on the supply voltage that looks like a shaded-in capacitor?

I am looking at a datasheet for NJM2073 (dual low-voltage power amplifier). On the fourth page, there is a sample circuit; right at the V+ input there is a symbol that looks like a capacitor. However, ...
21
votes
3answers
885 views

What's a schematic (compared to other diagrams)?

What's the difference between a schematic, a block diagram, a wiring diagram and a PCB layout? Why do engineers want a schematic instead of a wiring diagram? Where does Fritzing fit into this?
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0answers
47 views

Testing FPGA-based SPWM

Sinusoidal Pulse Width Modulation (SPWM) was written using verilog in FPGA and it was simulated in ModelSim. The next task is to test it in actual hardware setup. The pulse of FPGA is 3.3V and we ...
1
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1answer
68 views

Eagle PCB: how to get BOM from a library part?

I am using a library part in my Eagle PCB schematic. I would love to learn more about what's inside / what sub-components the library owner used to make it. Is there any way to do this? For example ...
1
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1answer
79 views

Review and question about AD9838 circuit

I have tried to come up with a schematic of using AD9838. I used the eval. board schematic and modified it to my needs. The eval. board schematic can be found on page 9 here: AD9838 eval. board ...
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2answers
64 views

Understanding audio port schematic

This is a typical audio socket. In the datasheet there is a schematic, but it only has description for 3 pins out of 5, what is the use of the rest of the 2 pins?. Also what does the symbol in front ...
0
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1answer
314 views

Xilinx and VHDL · Why is this INOUT port undefined?

I'm using Xilinx ISE 13.1 x64 WebPack for a college assignment and I'm implementing a BCT for the sake of it. It's a Binary Coded Ternary. Like a BCD, but with only three digits (0, 1 and 2), to ...
4
votes
1answer
53 views

Custom >NAME group for components in EAGLE

I'm designing custom component library for my project and I'd like to create custom naming subset for my custom parts. When ever I create custom part the default naming order is U$1, U$2 etc., when ...
2
votes
2answers
140 views

BCD to 7 Segment Decoder Schematic: Need help fitting in page

I am working on the schematic for a BCD to 7 segment decoder right now. I understand the logic, but it is the design of the schematic that I need help with. Here is my schematic so far: As you can ...
2
votes
1answer
96 views

How do I connect this piece of electronics to show the digit display? (from satellite decoder)

I have the following piece of board/electronics: Link: http://i.imgur.com/jwomLz8.jpg Link: http://i.imgur.com/4BCKU21.jpg Now, I recently bought an arduino, so I want to connect the digit ...
3
votes
2answers
295 views

How to create block diagrams efficiently?

TL;DR: Need good block diagram schematic drawing process. Table of Contents Topicality and Relevance Question Topicality and Relevance Topicality: John F. Wakerly, in his book Digital Design: ...
4
votes
4answers
554 views

What does this schematic symbol indicate? (Bent line)

I'm looking at a schematics of a power system, and encountered some schematics I find quite strange. As you can see, the schematic contains a lot of bent lines. I have two hypothesis: It indicates ...
1
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1answer
102 views

Which “schematic editor” is used here?

Kindly help me identify the schematic creator/editor used.
1
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1answer
122 views

Gain of this schematic

I am interested in the following compressor, which I reverse-engineered from a pcb (there might be some mistakes, but I don't think so) (open the schematic in a separate window to see the small ...
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0answers
116 views

Placing separate 5V rails on a single schematic/board in Kicad

I'm working on a board with what is essentially two separate circuits. Both will run on 5V supplies but I would like to keep them separate in case I need to power them from separate sources. They do ...
2
votes
4answers
597 views

What is this electronic symbol labelled “Current Source”?

What is this electronic symbol? How do I physically implement this? simulate this circuit – Schematic created using CircuitLab