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Questions tagged [schematics]

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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How to diagram power-side and ground-side switches?

I'm an early-stage self-teaching hobbyist. Just as a practice exercise I'm diagramming simple circuits (without looking at the instructions) of DIY kits that I've bought on banggood.com (awesome ...
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1answer
30 views

LCSC parts for Coil & Capacitor

Greeting, I'm using This Schematic as a reference to create a customized BLE PCB board. I need some help to identify the below parts (with LCSC part No. if possible) as this is my first time to see ...
8
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2answers
708 views

Schematic conventions for different supply rails

I have two ICs in my circuit. They have different supply voltages, 3.3 and 2.7 volts. The voltages are subject to change as we refine the design. I'm trying to come up with labels for these rails. One ...
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0answers
75 views

Which software was used to draw this schematic diagram? [closed]

Using which software, the following schematic diagram is made?
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1answer
31 views

PSpice AC Circuit Simulation Showing 0 V for Output Voltage?

I am trying to run a simple Op Amp simulation. My lab gives zero instruction on PSpice, tossed us a brief manual on DC PSpice circuits (even though the class is AC), and said go forth. The circuit I ...
3
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1answer
294 views

Help understanding 1986 schematic for Rohde & Schwarz cryptographic key generator

From https://www.cryptomuseum.com/crypto/rs/pu104/index.htm :- PU-104 was a key generator for perforated paper tape, made around 1986 by Rohde & Schwarz (R&S) in München (Munich, Germany). ...
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0answers
29 views

Designing a prototype pcb in Eagle with other parts imported?

I am protyping a project with several boards like microcontroller, charger, booster etc. for my bachelor's degree in electrical engineering. Now I want to switch from my prototype board and etch my ...
1
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1answer
41 views

Replacing elements in a tube amplifier

I assembled a tube amplifier.According to the specified scheme (Old Russian radio "Record 66"). 1.What is the function of capacitors C9 and C8 ? 2.What will change the capacity of these parts? Will ...
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0answers
20 views

Design pads and import to OrCAD PCB; or design directly in OrCAD PCB designer after importing other components?

I have a problem with layout design of pad. After creating the netlist and doing the routing, I want to add some single long pads to the board without packages to be able to solder wires on these pads....
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38 views

How to find the effective resistance across the points A and B here?

I had to draw the circuit and take a picture of it as I am not very educated with circuit drawing software. The circuit consists of 5 resistors with their respective resistances written beside them. ...
0
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1answer
50 views

Decoding circuit with transformer topology

I am studying a circuit used for mobile adaptor, where AC to DC conversion is done through bridge rectifier ABS210. Transformer is used for isolation along with IC LP3783 (Offline PSR Driver) and ...
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0answers
27 views

ERC error EAGLE

I do not understand why I am getting and error for the POWER pin IC2 and IC3, I have attached Vcc+ to + and Vcc- to -. What am I doing wrong?
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0answers
18 views

ENC28J60 - is this connection correct

Just wondering if this is correct. I never used to design anything using this chip.
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0answers
46 views

NMI Input circuit on a MCU

This circuit is connected at the NMI input of a MCU. The 'J2s' pin is connected to an external signal. Is it some sort of delay circuit or some filter circuit? Edit: J2s is digital signal coming ...
1
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1answer
47 views

GPIO Configured as Input OR Output

Is it possible to identify looking at the schematics whether a GPIO pin is configured as Input or Output pin for the case in following image? PIN93 and PIN94 of a MCU are connected directly with ...
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2answers
93 views

Schematic to PDF [closed]

I have 3 schematics files. I want to convert those to PDF format. I don't have the full version of software that can do it. Is there any other way to do the conversion? The free trial version is ...
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2answers
115 views

Strange MOS design

I saw this kind of MOS used as this : simulate this circuit – Schematic created using CircuitLab I don't think it can work & I m not sure a mos used like this can be used as a reverse ...
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0answers
40 views

What is the binary format of the OrCAD .OLB files?

I want to auto generate .OLB files for my own components, so I need to either use Orcad Capture scripting, or alternatively write the binary .OLB files myself. Is there anybody that have seen a ...
0
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2answers
72 views

Explanation of an electric motor schematic

Below is the schematic of a Bosch electric motor: What are the three double-lined (one thick one thin) elements on the left side? What is the part on the right (black thick lines)? What is the white ...
0
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1answer
29 views

How to show or print all the parts in an OrCAD library (OLB) file?

I have a .OLB file for OrCAD schematic where there are multiple part in. I an open the .OLB file using File => Open => Library, and I can also successfully place parts in a design. From previous ...
1
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1answer
60 views

Unnamed bus connections in schematics

I thought I could read schematics, but I have this problem: sometimes there are unnamed signals connected to buses and I don't know where they are supposed to be connected. Example: IC3 pis 14...23 ...
18
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3answers
4k views

What does a resistor value of “NOM” mean?

On this schematic of part of the Apollo Guidance Computer (found here), some resistors have a value of "NOM." According to this question, "NOM" stands for "nominal" when it's found in a datasheet, ...
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4answers
119 views

How to connect these two resistors like on the schematic?

I am trying to connect CAN to the LPC1768, like here Expect that I don't understand the picture or the meaning of "you need two 120 ohm terminating resistors at either end of the bus". Does it mean ...
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0answers
48 views

MosFet Design Help

I posted yesterday about wondering what diode an SMD component on my board was. Here I am again, wondering if this schematic and PCB design looks reasonable. I looked at my original in hand component ...
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3answers
2k views

What does n/o and n/c mean on a schematic diagram?

Okay so I have two questions. I am looking at a schematic diagram of a remote control for a toy car and I can't seem to figure out what the "n/o" and "n/c" components stand for that are attached to ...
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1answer
31 views

Some schematic voltage values (physical names) missed when printed or generated in Altium

Maybe it's a silly issue, but the fact is that I don' t know why a voltage value is present in the schem project document but it will disappear from the destination document (printed or generated) at ...
3
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2answers
121 views

Is this symbol another version of a ferrite bead symbol?

I saw this symbol in the schematic of the ADPD2140z eval board. From what Ive seen online, ferrite bead symbols are usually slanted rectangles with right angled corners. This is slightly different, ...
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2answers
48 views

Altium pin parameters in symbols

thanks for the many great questions and answers over the years. This is my first question. I use Altium Designer for capturing designs. I had an idea to make my processor components a little more ...
0
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1answer
42 views

Altium net designator like option?

I'm looking to see if it is possible to label net names in Altium in some way similar to the concept of component designators (eg R? C?) which would enable me to duplicate a section of a circuit which ...
0
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1answer
77 views

Is this notation for a single capacitor or a dual capacitor?

So Im trying to repair the indoor fan on our ducted AC system (2 weeks wait to get it replaced on warranty). Capacity has exploded. I replaced it with a similar cap (8uF 400v) and wired it the same as ...
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1answer
63 views

Altering schematic for adaptor

I am trying to make a PCB for the attached schematic (mixer.jpg). Rather than run on 2 9V batteries, I would like to plug it into the wall using a +9 / -9V DC power supply. Do I need both diodes and ...
3
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3answers
597 views

How to keep the state of relay

In schematic below when current exceeds the set point of PR1 it toggles the relay and as soon as current drops the relay goes back to normal state: How can i keep the relay state as triggered even ...
0
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1answer
60 views

current sense switch

This schematic triggers the relay when current exceeds 1-3A: I want to do some modification in this circuit; How can i reverse the circuit working to trigger the relay when power connected to INPUT ...
0
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1answer
205 views

Overcurrent protection for DC motor [closed]

I found a circuit to protect DC motors from stalling: this is the schematic: and this is the board I made based on that schematic: When the power is connected to the circuit makes all LEDs on but ...
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2answers
214 views

Bus vs Signal Harness in Altium

I am designing a Schematics for one of my big project. I am using Hierarchical Design for my project. My Schematics has one processor which has 5 UART. The UART nets have names like ...
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1answer
77 views

Light Activated Switch

Can I use a 12 V power supply as the source of electricity for this circuit? And where do I connect the positive/negative of my power supply? I'm a bit new to this so please understand, thank you.
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2answers
114 views

Why is my dark activated circuit not working?

When I turn my circuit on the LED turns on but even in the dark the LED is still on. Can someone help me?
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2answers
55 views

How to convert light activated switch into dark activated switch [duplicate]

Can anyoe teach me how to convert this into light activated switch (https://i.stack.imgur.com/r6lZH.jpg)
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0answers
70 views

How to convert light activated switch [duplicate]

Can anyone teach me how to convert a light activated switch into dark activated switch vice versa.
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1answer
37 views

Connecting multiple Net Labels to same Net Wire

I am using Altium Designer 17. My schematics is Hierarchical and divided into multiple sheets. Few sheets have microprocessor ...
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0answers
47 views

Attiny 841 dev board schematic review

I am about to send a custom Attiny841 dev board (aimed at Optiboot) to production and I thought, since I never used netiher this microcontroller nor the USB-UART converter before, I'd come here and ...
0
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3answers
125 views

What is the best program for designing circuit diagrams [closed]

I am trying to find a free program for designing circuit diagrams. Is Autodesk's Eagle program any good or is that just for designing PCBs. I've had a look at Microsoft Visio but I don't really want ...
0
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2answers
106 views

How to Convert 28V to 12V?

I have to use a 28V DC power supply for a certain design I am doing. But I only need 12V DC to power up this device. How would I design this in a schematic? What would I need? I have been searching up ...
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2answers
109 views

Does this prototype match the schematic?

I'm following this project which shows how to make an OpenTherm Adapter for an Arduino. It includes this schematic: Along with this simplistic PCB diagram: I am now in the process of making my own ...
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0answers
46 views

Updating schematic symbol in Altium

I'm trying to learn Altium and would like to know if someone can point me in the right direction here or if it's even possible to do this. So I've created a 20 pin symbol on a .SchLib for an IC and ...
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0answers
22 views

Building a Shunt Active Power Filiter Using

I am trying to built an experimental setup of a shunt active power filter to validate some Matlab simulations, I am using a SEMITEACH B6U+E1CIF+B6CI. (Here is the datasheet) and picture of the device :...
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0answers
63 views

Orcad Schematic Capture. Instances vs Occurrences

Using Orcad capture to create a multi-page hierarchical schematic I used the "Annotate..." option to renumber all parts. First set the them to "?" then incrementally update them. However, after this ...
20
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2answers
4k views

Is it ok to 'snake' the flow of my schematic?

I recently watched this video by EEVblog on drawing schematics. One thing he talked extensively about was that the logical flow of a schematic should flow from left to right. Whilst this makes ...
5
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1answer
132 views

How the PCB-A are designed?

I don't know if the question is straightforward. I am not interested in the manufacturing process, soldering, testing, etc. When I am working on a school project, first of all I try my design on a ...
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1answer
42 views

TPS26601 Industrial eFUSE Circuit Design

I have been designing a circuit for various Power protections like overcurrent, overvoltage, ...