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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0
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2answers
63 views

iPhone schematic help

Could someone help me understanding the markings of this schematic? What the little numbers I circled in red and yellow are. Is c59 providing power to that entire circled area or is just two points ...
-3
votes
0answers
16 views

Lattice Diamond 3.7 - schematic design [closed]

I have schematic file (decoder.sch) and I can't rotate an existing symbol - CTRL+R isn't work (is disable) How to rotate existing symbol? Thanks.
0
votes
1answer
28 views

Kicad: How do just drill holes and have solder pads for external connections to a PCB?

I'm having trouble finding this, so my apologies if this is a stupid question. I am creating a PCB that where my schematic has 5-6 pots. These pots will be mounted on an external panel, not the PCB. ...
0
votes
1answer
74 views

Can you name this schematic symbol? [duplicate]

What does this schematic symbol mean?
0
votes
1answer
53 views

Addding Chip Schematics to Proteus

NOTE: I most probably have lack of information on this topic. So rather than reacting furiously or deleting my post; you can inform me, so I can edit/update my post. I want to start learning to ...
1
vote
1answer
29 views

Altium: How to change several components at once in order to save time and effort?

I am drawing a schematic in Altium Designer. Sometimes, I need to change some components from one value to onther. For example, I have 10 capacitors of 1 pF and need to change them all to 2 pF. Is it ...
20
votes
4answers
5k views

What is a “100R” resistor?

Sometimes I see references to "R" resistors. For example: Obviously the 100 refers to 100 Ohms. What does 100R mean?
1
vote
1answer
59 views

schematic symbol from power supply, two triangles pointing together

What does the symbol marked Z1 (two triangles pointing towards line) represent in this schematic?: This is coming from the reference design on page 10 of the LD7550-B pulse width modulator ...
0
votes
1answer
34 views

Altium port rotate

In Altium Designer, I am trying to place a input port to the right of a symbol like in the picture. But I want to rotate the port 180 degrees so the pointy part points left instead of right. Whenever ...
1
vote
0answers
18 views

Copy component from Library to another in Altium [duplicate]

I am creating a new schematic library in Altium Designer and will add different "New Components" on it. Since I already have similar components in another library, so I want to copy some components ...
0
votes
0answers
38 views

STM32F405 with 1.8" TFT from Ardafruit

I am developing a project, and to make things a bit easier I am wanting to do a small TFT to output some debugging information and I'm having some issues with the schematics. Here is the screen https:...
1
vote
2answers
43 views

How to connect VCC and GND conections of buffer 4050 on eagle?

I am unsing a 4050, the schematic usues the triangle representation. I have added a VCC and GND connectors to a power supply of 3.3V in the schematic hoping eagle recognizes the connections, but the ...
1
vote
2answers
63 views

How to make a NAND Gate?

Im using 123d circuits by Autodesk and I am trying to make a NAND logic gate. When i simulate my circuit (one in picture) it does not work and the LED does not turn on. I am using 2 NPN transistors, ...
1
vote
1answer
36 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
236 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
32 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
26 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. ...
4
votes
1answer
37 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
78 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
613 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
175 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
128 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
120 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
132 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
votes
0answers
25 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 ...
-1
votes
1answer
73 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
38 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?
-2
votes
1answer
59 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
127 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
81 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
75 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
40 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
85 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
39 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
81 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 ...
-2
votes
1answer
80 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 ...
6
votes
2answers
441 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
31 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
59 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
46 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
23 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
19 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
44 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
474 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
140 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
81 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 ...