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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0answers
71 views

Will this circuit function? [duplicate]

I have this circuit, based on this. I already have a question about this here, but it was getting really long, and hard to read. I created this to make it easier. My circuit: I use an 11.4V ...
1
vote
2answers
86 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
50 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
453 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
49 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
46 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 ...
1
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0answers
33 views

Can I change VCC pin to 3.3V on a 5V Arduino Pro Micro? [migrated]

I'm using a 5V Arduino Pro Micro (schematic). For my project, I'm using the VCC pin to output power to an external device. I need VCC to output 3.3V to the external device. Can I open jumper SJ1 to ...
2
votes
1answer
96 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
77 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
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0answers
39 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
103 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
135 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
155 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
23 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
62 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
93 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
votes
3answers
71 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
567 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
56 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
67 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
90 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
129 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
104 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
178 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
88 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
74 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
90 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
72 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
313 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
85 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
287 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
votes
1answer
55 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
591 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
49 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
votes
3answers
120 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 ...
1
vote
1answer
335 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
vote
1answer
121 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 ...
0
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0answers
37 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
101 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
votes
2answers
101 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
123 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
vote
1answer
307 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
vote
1answer
402 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, ...
24
votes
3answers
1k 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?
0
votes
0answers
49 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
vote
1answer
74 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
vote
1answer
86 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 ...
1
vote
2answers
66 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
votes
1answer
397 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 ...