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

Stencil schematic creation software [duplicate]

quick question, I am able to create schematics in EAGLE and other online based tools. But for the purpose of creating basic schematics, i.e. no model numbers, with basic stencil component outlines? I ...
4
votes
2answers
225 views

Weird 240 ohm resistor on zq line to DDR

I've been looking at schematics that interface ddr ram and noticed a weird notation for their zq pull down resistor. What is with the dot at the top as well as the 1%? Haven't seen this before.
3
votes
1answer
106 views

Circuit Considerations

Note: Can skip all images except last, which is a schematic created using the editor. I am at a point in the design process where I have created a schematic of the circuit that I want to create. I am ...
-1
votes
0answers
26 views

Altium Junction & component colors

I've recently started using Altium Designer 16. So far I am very pleased, but the default schematic layout is not in my likings. This is why I ask, how I can change the default colors for various ...
1
vote
1answer
22 views

How to hide/delete the symbol pin types (named as pas/sup) from the eagle schematics?

Hi there, I was trying to do something and not sure what I did without knowingly those small green circles along with names has appeared on ever pin of all the components I had in the schematics. ...
-1
votes
0answers
31 views

Is there an open source wlan router supporting dd-wrt [closed]

My router is not working anymore and I'have two options either to buy a new one, which is not very fancy or use my PCB designing skill and to make one by myself. Is there an open source wlan router ...
4
votes
1answer
34 views

Is there a way to batch copy port names over to net names

version Altium Designer 15.1 Scenario I have a several pins wired to ports. I want to remove the ports and add net names to the corresponding wire I want the wire net names to be the same as the ...
-1
votes
1answer
75 views

Reduce dev board schematics to custom board for production [closed]

There is already a post on here that is very insightful and related to my question "go from dev board to production board". However, I need a lower level understanding of schematics. I've searched the ...
2
votes
4answers
607 views

I can not understand this circuit diagram

I've many questions about this circuit diagram. I found it on the datasheet of NCP1012. It is a switching mode power supply SMPS. Are E1 and E2 electrolytic capacitors and C1 and C2 Ceramic ...
2
votes
1answer
158 views

What is the difference in the terms “signal return”, “signal reference”, and “signal ground”?

Are there common interpretations for each of these or are they all used interchangeably? For example, node names in a circuit schematic with a earth ground, power lines, and signals lines should use ...
1
vote
2answers
124 views

Schematic reading capacitor values

I've got a schematic that i found on the internet. The schematics is for a solar pwm charger designed around a microcontroller in this case a arduino. The problem lies in the values for the ...
5
votes
2answers
116 views

Best practices in making cable schematics

I would like to make cable schematics for manufacturing that would include: cable lengths connectors pins conduit length heat shrink tube length and have a BOM for that automatically generated in ...
0
votes
1answer
131 views

Is this schematic good?

Here is schematic for DC motor control. Using this I can drive motor in both directions and also send short pulses to motor, to move it only a little bit in desired direction. Let me explain schematic ...
0
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0answers
21 views

Assigning LED in the schematic capture to a package in proteus

How to assign LED's in schematic capture in the proteus in to a package inorder to use it in the PCB layout. I am designing a sensor board for a line following robot. I designed it in the schematic ...
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votes
1answer
68 views

Transistor PWM Switch H-Bridge

Update from old post I have made a completely different design and was wondering if you guys could take a look. Schematics: http://imgur.com/a/5GRe5 Description: Figure 1 is a charge pump, boosting ...
0
votes
0answers
25 views

help with variable astable multivibrator dual contact circuit/schematic needed

I'm looking for a astable multivibrator circuit similar to this: http://everything2.com/title/astable+multivibrator But instead of alternating between 2 LEDs, I need it to be 2 contacts/switches, ...
0
votes
1answer
32 views

Is There a Symbol for an Inrush Current Limiter?

Is there a schematic symbol for an inrush current limiter, or is a resistor used instead?
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votes
1answer
57 views

How to calculate the energy consumption of a liner sensor array?

I'm trying to determine the energy consumption of a device in kilowatts, but I'm having trouble because the datasheet provided only gives me estimated voltage and not amps. DATASHEET: http://pdf....
0
votes
2answers
115 views

How do you check your schematic before passing to layout [closed]

I am working with Altium. What verification do you particularly do when going from schematic to layout in terms of electronic and in terms of capture ?
1
vote
4answers
118 views

Where do these grounding wires go? [duplicate]

In the following schematic the two Vss pins where are supposed to be the grounding pins don't connect to anything. Does this mean that the circuit is self-grounding (if that's even a thing)? I'm ...
0
votes
2answers
71 views

What does J1, J2 and J3 represent on a Schematic?

I'm looking at this schematic for the TSL1401 line scan camera module and trying to understand what the various pins do. I understand what the labels SI, CLK, AO and Vdd mean but I'm totally lost when ...
0
votes
2answers
74 views

Why are two LEDs on? is 7489 broken?

This is a follow up question to this question. I have attempted to draw a schematics of my setup for the 7489 below. Without the switch closed, the LED D1 is on. Then the switch is closed, then also ...
1
vote
3answers
37 views

Schema for protection system

I have a client that has an equipement in an area where sometimes electricity goes on and off many times a minute , and it can dammage his equipement, so he asked me for protection system that works ...
0
votes
2answers
74 views

Schematics for using IC 7489 memory

I bought two SN7489 because I wanted to learn how the memory chip works. I followed the datasheet. I don't seem to be able to get it to work. After playing around for some time with the IC, it got ...
0
votes
1answer
34 views

dsPic33f : How to interface ECAN with CAN High/Low Signal

I want to start communication between (dsPic33f) ECAN_Module & PCAN-USB ADAPTER I have downloaded a demo code AN1249 from microchip website. I am using Explorer-16 board for Testing. Now the ...
1
vote
1answer
74 views

choosing a voltage regulator chip

I'm designing a schematic for a system that will utilize plug-in daughter boards. I'd like to provide the daughter boards with high quality 12V, 5V, 3.3V, and 1.2V, with up to 5A, available via pins ...
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votes
1answer
77 views

Coil Gun Schematic [closed]

I have a question. I have been looking at making a Coil gun lately and i had an idea for a simple one. Just need to know if it would work. Basically: Battery-->Switch-->Diode-->Transformer-->Coil For ...
5
votes
2answers
409 views

What's a potentiometer with four terminals in this schematic?

I'm reading the datasheet for a TDA2005 IC. In it, there's a application circuit schematic with two potentiometers that have a fourth terminal in it. See below: The components I'm talking about is ...
0
votes
0answers
21 views

Example Multilayer .cpm file for Cadence 16.6

I'm trying to learn Cadence PCB Editor Allegro GXL and Design Entry HDL 16.6. I searced for sample multilayer schematic and board files which are in same .cpm project, but i couldn't find. If you ...
2
votes
1answer
53 views

Sub-circuit in Altium

I am working on Altium Designer and I would like to create a subcircuit from existing components. To be more clear, I want to be able to create a new part from a schematic I already draw. For a very ...
0
votes
1answer
41 views

Design of the two stage amplifier with p-type input

I have to design the two stage amplifier with p-type input (p-type diff pair), the schematic bellow: However, mostly tutorials discuss the same architecture but with n-type input. My main ...
0
votes
1answer
21 views

Altium bus connections with sheet hierarchy

I am using a bus to connect a repeating module to an MCU in Altium. I've tried numerous variations and can't find an example the same as this. I'm not sure which should have labels and which shouldn't ...
0
votes
1answer
18 views

How to use an ASY2400 Xenon Flash Unit

Background: I just picked up an ASY2400 Xenon Flasher unit from a local electronics store. I found this hookup diagram for it: I connected a potential difference of 12V to the board. +12V to pin J4 ...
1
vote
1answer
36 views

Can't find TC117HS and RX28 data sheets

I am trying to adapt an RC car to control it with an arduino. In order to do that I am trying to understand the PCB. In the car PCB, there are: one "RX28 TXM ZYX13AA" with 16 pins two "TC117HS ...
0
votes
1answer
31 views

Are the digital pins in this schematics shown wrong?

The output from the phase detector H11AA1 going to Dig Out and the Dig In goes to the input of optotriac in the following circuit: Image Source Shouldn't it be the other way around?
5
votes
4answers
399 views

Can you load Gerber files back into a PCB layout designer such as Eagle?

There's a PCB I may need to change a solder pad, but the schematic and layout are gone and were not added to source control. Is it possible to load the Gerber files back into a designer to change the ...
0
votes
0answers
89 views

UPS symbol for schematic

I'm using QElectroTech to draw a one-line diagram of an electrical installation that has some UPSs installed. The software has no UPS symbol for one-line diagrams. The one available is single phase ...
3
votes
1answer
77 views

ATSAM3X8E: Custom Arduino Due Design

I'm currentlry doing a redesign of the Arduino Due board to include some additional features I need. Browsing through the Datasheet of the ATMSAM3X8E atmel chip, I noticed that the 12Mhz Oszillator ...
1
vote
4answers
126 views

What do these dashed/dotted lines mean in this power cord schematic, and how should I ground this device?

--Edited at Sparky256's suggestion for better clarity-- Background Information I'm making a power cable for a piece of obscure, surplus military equipment (an AN/UGC-74B teletype, to be precise). I ...
1
vote
3answers
128 views

Component with multiple VCC and GND pins. Should I connect all of them? [duplicate]

I want to make a really small arduino using the Atmega 328p and I noticed that it has 3 GND pins and 2 VCC pins. I measured the pins and it seems that all GNDs are connected and all VCCs are ...
20
votes
4answers
2k views

What is the use of an op-amp whose output and inverting input are connected to ground?

I am in first year of Engineering school and I was given an assignment containing this circuit, which drives pressure sensors in a pitot tube : I am struggling to understand the whole circuit, and ...
3
votes
1answer
113 views

What is this symbol?

I am in first year of Engineering school and I was given an assignment which contains this circuit which drives pressure sensors in a pitot tube : For training, I am trying to reproduce it using ...
3
votes
1answer
37 views

Altium: Change Net Label Size and Font at once!

I have a complete schematic project in Altium Designer. I need to change Net labels text and font. Since I have a huge number of Net Labels, I am wondering if it possible select for instance 20 ...
1
vote
1answer
82 views

Measuring DC current with Hall Effect sensor over PIC on the same circuit

Before I begin with my question just so you know I'm not very familiar with electrical engineering so please forgive if I ask some dumb question :) What I want is to know if I can use Hall Effect ...
1
vote
1answer
79 views

Altium warning: Adding items to hidden net +3.3V

I am drawing a schematic project in PCB Designer and facing the following warnings when I compile the project: Adding items to hidden net +3.3V and Adding items to hidden net Ground When I double ...
-2
votes
1answer
92 views

What kind of this electrical schematic? [closed]

I have to re-draw this schematic by Office Visio but don't know what kind of this schematic is, and how to find these components in Office Visio.
0
votes
0answers
32 views

Amplifier Schematic Question

I have acquired two Hitachi ss-81A (not my post, but same speaker model) and I want to build an amplifier for them. They are 8 ohm, 4 watt max speakers. From my research so far, it seems like the ...
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votes
1answer
66 views

Help choosing component values for a relay delay circuit

I want to build a circuit that controls a relay with the following specifications: the relay should turn on and stay on for ~60 seconds after the button is pushed the relay should stay on as long as ...
0
votes
1answer
33 views

How to remove pin name from Eagle Device Page? [See Image]

How to remove those pin name from Eagle Device Page?
3
votes
1answer
62 views

Is my Bob Smith termination valid for Ethernet 100Mb/s?

This is my first ethernet circuit, and I am a noob in differential signal lines. That is why I want to learn with a "simple" circuit. I use the reference schematics from the LAN9512 usb to ethernet ...