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.
0
votes
0answers
14 views
2-bit multiplier in ABEL-HDL [on hold]
I have a project for school in which I have to implement a 2-bit multiplier in two different ways, using ABEL-HDL (I use ispLEVER Classic 2_0). After I implement these 2 ways, I have to program a ...
0
votes
1answer
34 views
DIY Remote Control Circuit [on hold]
I am trying to make a simple remote control arm and car, and I have all the parts for the arm and car but the problem is making the remote control part. I am new to Remote Controls and don't know what ...
0
votes
0answers
9 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
31 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
29 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
19 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
15 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 ...
0
votes
0answers
14 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
318 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
41 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
0answers
50 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
95 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
105 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 ...
0
votes
0answers
22 views
How to Simulate 10w LED packages in Circuit Lab
I've been messing around buying random electrical components from China and I came across these 10w LEDs and, after seeing how bright just one was when supplied with 12v at 900mA, now I'm looking for ...
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 ...
2
votes
1answer
111 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
29 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
55 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
46 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
90 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
30 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 ...
-2
votes
1answer
64 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
28 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
46 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 ...
0
votes
1answer
19 views
Schematic representation for net connected to specific component
I have a board with a +5V trace from a current sense resistor across a noisy +5V plane to an OpAmp, so I thought I'd shave that particular yak soon and create a few symbols for KiCad that actually ...
1
vote
2answers
97 views
GND in a DC circuit with circuit board
I wonder a question. Let's say I use a circuit board in a project (the left hand side on image below, not the Verabod), and I want to solder a circuit on it.
For example, I want to use the circuit ...
0
votes
0answers
18 views
LCD interface and contrast adjustment scheme
I am referring below graphical LCD. But since it's datasheet is not thorough, I have few queries in interfacing.
Interfacing:
VDD,LEDA is 5V and VSS is Ground.
How Vo,Vout connection is to ...
2
votes
4answers
134 views
Difference Between - (Minus Sign) and Chassis Ground in Schematics
I was working on building some projects from the book Electronic Projects for Musicians and I noticed that in most of the schematics there are two symbols for what seems to be ground. One is a - ...
3
votes
3answers
149 views
Altium Schematics: what does Locked function mean?
I am drawing a schematics in Altium Designer and faced this function when I double click on the components. I need to know when there is a component with different parts, ex: 4 parts. I have to assign ...
1
vote
1answer
125 views
Xbox one power adapter wiring - converting it to a 12 volt power supply
Thanks for having a look at my question.
I know this may seem like an odd question but here is the history of it.
I have a Solidoodle 4 3D printer, Its powered by a knock off xbox 360 brick adapter ...
0
votes
4answers
120 views
Possible error in schematic; unrealistic capacitor
I am trying to get the parts for this electromagnetic coilgun, and I have gotten almost all of the parts. I cannot seem to find the 1,000 uF 1.5KV capacitors (C3 and C4) for the voltage ladder, and ...
0
votes
1answer
88 views
Chess-Board schematic/pcb layout
Hey guys as described here I also want to make a chess board with some arduino support.
Here I want to ask some questions regarding the schematic and the pcb layout I am planing to do. @Dmitry ...
3
votes
1answer
54 views
Altium error: Net contains multiple output sheet entries
I'm having a hard with this one and cannot figure out how to deal with it. As shown in the figure below, ADC[0..2] is going out from A2 and A3 and in to A1:
In details:
ADC 0 is the output of ...
1
vote
1answer
36 views
Altium Designer: How to handle these type of Nets?
I have such complicated Bus [0..4], which go out from Page 2 to Page 1, and then from Page 1 to Page 3 as shown in the figure below which is a Top Sheet:
I receive the following error when I ...
0
votes
0answers
25 views
230 VAC signal with spark capacitor should work on a high-impedance sensor
Preface
There are lot of a motion sensors which turns on L (phase) on its output. In my case I need to connect this output to my board to 'sense' the motion. To do this I put 1 MOhm resistor between ...
2
votes
1answer
116 views
Why do these triangle symbols mean?
In configuration B in the image below, what do the triangles mean?
3
votes
2answers
334 views
Altium deisgner: drawing 4x10k resistor
I am drawing a schematics in Altium Designer. Based on an old design, there is 4*10k resistor as shown in the figure below. It is actually one component (one Part No in the library) with 4 different ...
0
votes
1answer
32 views
Upper and lower dimmensions in schematics [duplicate]
What is the difference between upper and lower dimmensions in schematics?
So far I have assumed that those are simply maximum and minimum values specified by the tolerance. Is my assumption correct?
...
5
votes
1answer
800 views
Meaning of “caps not pop with watch crystal” in a schematic
caps not pop with watch crystal
You can find this sentence in ADuC 841 evaluation board schematic. Could someone explain what does it mean?
0
votes
1answer
96 views
Altium: Unconnected port “xxx” at 550,430
As a new in Altium and trying compile my PCB project. I got a warning which says:
Unconnected port "xxx" at 550,430
It seems really strange since I see a normal port which is connected to a BUS at ...
6
votes
4answers
247 views
Minimum energy required for LED blink to be visible
I have a 5V schematic with 15n capacitor and I wondering if I will be able to blink an LED, powered from this capacitor. My calculations is that the capacitor will have about 0.2 uJ of energy. This I ...
2
votes
2answers
95 views
Altium error: Open emitter pin and power pin object!
I am new with Altium Designer. I receive the following error:
(+12V contains Open emitter pin and power pin object!)
Here is the error schematic part:
The error is in Pin 4. Any TIPS?
0
votes
0answers
73 views
altium: where to find a generic logic gates ICs?
I'm looking to add a few generic logic gates to a schematic in Altium. Where can I find the components?
I don't need to simulate the circuit and I don't need a PCB footprint - just the schematic ...
17
votes
5answers
3k views
What does “Piggy” mean in this Schematic?
What does the word "Piggy" mean in this schematic diagram?
I found some sections of a schematic where a part is denoted as "Piggy".
What does it mean?
0
votes
1answer
52 views
12V peristaltic pump flow control
I have 12V peristaltic pump and need to control its flow (lowering down more specifically)
Two options I came across:
POT in series
Voltage divider
Is there any shortcomings in above schemes?
...
1
vote
1answer
40 views
Assigning numbers to the new components in Altium designer?
I am drawing a schematics in Altium designer. I have several schematics (sheets) in my current project. Some of the components have already a designator numbers like R5, C20, L13 ... etc.
But some ...
0
votes
1answer
54 views
Project libraries don't show in Altium 14.1
I am having strange issue, because when I open my schematic document and try to add component, when I click on Libraries (it doesn't show my project libraries).
Libraries.
I try to edit in ...
-2
votes
1answer
92 views
is there a way to light up the second led and not the first one? [closed]
simulate this circuit – Schematic created using CircuitLab
In this schematic I made I'm trying to light up a a series of LED's but not in sequence "not yet" what I want is to raise the ...
0
votes
2answers
68 views
7.2VDC and 6VDC power supply from 12V transformer
I have a Arduino MEGA2560 clone, 5pcs of standard size servo motor (model MG996R) and 2 pcs of micro sized servo motors (model 9G), which I have to supply with DC power. And because the micro Servo 9G ...
