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
32 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
69 views

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

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 ...
0
votes
1answer
25 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
187 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, ...
20
votes
3answers
549 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
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0answers
35 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
37 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 ...
0
votes
1answer
48 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
59 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
72 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
39 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
79 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
88 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
134 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
388 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
vote
1answer
95 views

Which “schematic editor” is used here?

Kindly help me identify the schematic creator/editor used.
1
vote
1answer
112 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 ...
0
votes
0answers
81 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
450 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
6
votes
1answer
125 views

Crystal oscillator in schematics

What the numbers 1 and 2 mean next to Crystal oscillator in hardware schematics? I tried to search online and went through about 20 lists with component symbols, but non had the numbers nor ...
2
votes
2answers
179 views

What is the purpose of the capacitor in this schematics?

I am trying to understand a RTC module from Sparkfun. I don't understand the purpose of the capacitor in this circuit. Here are the procduct's page and the schematics link. Can some one please ...
2
votes
1answer
79 views

Is there a standard reference designator to use for labelling indicator lamps in schematics?

In a schematic, LEDs typically are labelled using the letter 'D' since they are diodes. From what I can tell, it seems that there is no standard for labelling indicator lamps (e.g. small incandescent ...
4
votes
1answer
135 views

Is there a schematic symbol for a supercapacitor?

Is there a schematic symbol for a supercapacitor, as distinct from smaller polarized capacitors?
-1
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1answer
323 views

How to make a digital clock using MSP430G2553?

I want to make a digital wall-clock as a small electronics project. Since I am very new to this stuff I want to just try to imitate some already completed projects so that I can learn from them. I ...
9
votes
5answers
977 views

What does this symbol indicate (line with brackets)?

I'm modelling a power system, and encountered a few symbols I have never seen before in a single line diagram. I believe the first one is a switch with three possible position. Closed, open and ...
4
votes
1answer
763 views

What is the symbol for a Fan on a circuit? Is it just Motor?

I've been looking around for the schematic symbol to use in a circuit drawing for a FAN. I'm not sure it exists. Do we use a Motor symbol when wanting to show a FAN? And just specify the motor ...
1
vote
2answers
201 views

How to add “Diac” in OrCAD?

I am trying to add Diac component into my OrCAD v16.5 Schematic Layout. But, I only find this code below as a netlist. Even Though, I can't include the netlist into OrCAD Capture perfectly. It didn't ...
2
votes
1answer
88 views

How can I power a SCSI hard drive without a motherboard/scsi card?

While this is possibly more of a Super-User question, I chose to put it in EE because I'm looking for information about power assignments on SCSI cables, and understanding how to send power ONLY (not ...
0
votes
1answer
75 views

Which program can I use to draw schematics? [closed]

I would like to draw this schematic for my report. It will be used just for drawing and not for technical things. An example is this I found online. Which kind of program do you use?
2
votes
0answers
74 views

Altium: fetch nets of components from schematic alone with DelphiScript

I would like to automatically derate certain components in a schematic using DelphiScript. For example, say we have a 5V and 12V net in our schematic and some 16V capacitors on each of those nets. In ...
4
votes
2answers
170 views

Altium says my labels are floating

Been using Altium and multi sheet projects for a while. My latest project involves a lot of signals so I'm trying to keep things tidy using lots of labels, ports, busses. So I have a bus for enable ...
2
votes
2answers
210 views

Gain in Common Emitter Amplifier

I need to design an amplifier having a Vin=150mVp, 1khz; Vcc=3V that can run an 8ohms, 0.25 watts speaker, with a gain for about 7 without noticeable distortion. Below is my designed voltage divider ...
2
votes
2answers
544 views

How to Wire Up Ultrasonic Transducer

I want to use the direct time of flight method to measure the distance between a person carrying an arduino and a certain part of the room. I have come across many different boards which can easily be ...
2
votes
3answers
165 views

Adding braking to a H-bridge schematic

I followed this schematic to build an H-bridge: http://www.pocketmagic.net/2009/03/a-simple-h-bridge-design/#.UqjoLFXxteW Now, when I first switched it on, I was surprised that the transistors ...
2
votes
2answers
136 views

How can I become more accomplished at reading electronics schematics?

I know what the individual electrical components do (RLC). However, how can I learn to read schematics to determine what the circuit is doing? I have seen some experienced engineers looking at ...
0
votes
1answer
94 views

Symbol similar to thermistor

Ive come across this its a 4PDT switch, Im not sure of the symbol or the purpose of pins 13 and 14 Any ideas ?
2
votes
2answers
172 views

Can someone explain this simple schematic? (capacitor with voltage regulator)

Please understand that i am actually a really beginner in electronics. I found a really nice topic on how to create a 5V DC from a 9v power supply. All is ok. But in order to smooth out ripple, the ...
4
votes
1answer
108 views

Altium - Daisy-chaining repeated schematic sheets

Is there a more elegant way to do the following? Essentially I am trying to daisy-chain multiple "LED" devices, each with a data-in and data-out port. So do1 will be connected to di2, do2 -> di3... ...
-3
votes
1answer
241 views

How to design a schematic diagram of amplifier that can drive 8 ohms 0.25 Watts speaker? [closed]

I have here a schematic diagram for amplifier that drives a 0.025watts 8ohms speaker. But what I need is an amplifier that drives a 0.25 watts 8 ohms speaker. So, here are my concerns: How can I ...
1
vote
1answer
725 views

Can Proteus Isis open Eagle's schematic?

I had some years working with Proteus PCB design. A few years then, I did not do the same work. Now, from Googling, electronics community seem to place Eagle in a dominating position. Sparkfun, ...
0
votes
1answer
83 views

Where would I find or how would I build a laser driver for a 2W laser diode? [closed]

I have two laser diodes but I have no idea where to begin building my own laser driver. I would prefer to make my own but I will buy one if that isn't a good idea. Does anyone have a schematic of a ...
2
votes
1answer
208 views

Oscillator for High Voltage Transformer: RLC or Blocking Oscillator

What type of oscillator is being used in the schematic? How is that particular oscillator working in this circuit? I'm less than confident with oscillator theory, and I can't tell if this is RLC or ...
5
votes
2answers
171 views

Correct way to add High Side transistor to circuit with higher VCC than MCU?

I want to replace a physical N.O. switch with a microcontroller controlled transistor. The MCU is a ~3.3v MSP430. Since this is high side, I know I need a PNP transistor, and since the voltages are ...
2
votes
2answers
184 views

Microcontroller Protection

I used microcontroller for wireless application. Problems arise when I put the microcontroller in high rainfall areas. The microcontroller is often damaged by lightning. How to protect data lines ...
0
votes
2answers
130 views

Component libraries for schematic and layout design

I've got much difficulties to find the footprint for the components I have in hand: They don't have name (I buy them at somewhere similar to flea markets). Therefore, their proper footprints are ...
3
votes
2answers
133 views

Shift Registers Controlling Seven-Segment Display without a Latch?

I'm restoring a Model H Skee-Ball machine, and these old models have a bunch of hardcoded settings and unreliable switch detection, so I want to replace the main control circuitry with something ...
0
votes
2answers
83 views

Eagle converts board to schematic

There are times that a design is given constraints in the placements of components. For me, I would like to start from placing them first before creating the schematic. Is there such a capability in ...
0
votes
1answer
122 views

Bandpass audio filter in combination with PGA2311 analog ouput pins

I am working on modular preamp and I have Digital&Analog Power Supply, motherboard with CPU and Volume Control daugtherboard. On Volume Control Daughterboard there is an PGA2311 Volume Controller ...
0
votes
1answer
105 views

What software to graphically design a simple schematic? [duplicate]

I need to draw a schematic similar to that shown in the figure attached in this question. Are there softwares that allow to graphically design a schematic like that?
0
votes
2answers
141 views

What are these components in this schematic?

I have a schematic of my mobile phone. when i saw in the schematic, i saw two odd component. look: For number one: What are these both components? What's the usage of these? For number two: Is it ...