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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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1answer
42 views

Enterprise model blinkers - two fast flashes and pause for 3s and repeat LED circuit (with 555 and/or 556 and/or 4017) [on hold]

I'm building a Revell Enterprise Into Darkness model with LEDs and I need help with circuit that makes two fast flashes, pauses for 3 seconds, then repeats. as seen in the movie. I have searched and ...
4
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3answers
830 views

What is a Power on Reset IC?

I'm making a prototype based on the W7500P reference design, the latest version (updated 6 months ago) specifies the need for a Power over Reset IC. I do not understand the point of this component ...
-1
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0answers
33 views

Where to add RF power amplifier [closed]

I am trying to make a SX1262 circuit using this schematic, I have the values for the passives from the BOM already. But I do not understand the schematic very much, where would I place an rf amplifier ...
0
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1answer
79 views

Is this an appropriate smps design? [closed]

I am an engineering fresh graduate with an interest in PCB design. I have been learning KiCAD which is really fun and I enjoy it alot. A friend came to me with the reference circuit attached here and ...
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1answer
48 views

Checking my mpu6050 schematic

I am fairly new to pcb design and I just created a mpu6050 chip that will work with an Arduino microprocessor. I want to make sure the hookup is all correct before I start work on the other parts, as ...
1
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1answer
35 views

Faster refactoring in Altium Designer 19: Quickly converting a circuit fragment to a new sub-sheet

In the process of refactoring a large schematic sheet into smaller, more manageable, hierarchical sheets in AD19 I have the following process: Create a new schematic sheet for the sub-circuit and ...
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0answers
135 views

Could i get some circuit design feedback?

I have a computer science background and this is the first circuit I've ever designed. It is a lot of fun designing these circuits, but it also always feels like I'm missing a lot of "obvious" common ...
0
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1answer
31 views

Notation for switches in ladder notation

I was reading https://www.allaboutcircuits.com/textbook/digital/chpt-10/monostable-multivibrators/, and at the bottom of the page it has I read their page on switch notation, but it did not say what ...
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2answers
66 views

ESP32 powered by supercapacitors

It's been ages since I had to design something electrical so please don't laugh if this is stupid idea but I would like to power ESP32 with super capacitors, just for 30 sec or so so it can finish the ...
4
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2answers
1k views

Learning how to read schematics, questions about fractional voltage in schematic

In a schematic I've been reviewing I see in only one spot that there is a 1/2v going somewhere? What does that mean? simulate this circuit – Schematic created using CircuitLab
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2answers
100 views

Butt splice electrical symbol

I'm making a detailed electrical diagram which needs to include splices. From researching on Google I couldn't find the conventional symbol for a butt splice, or even a splice, in an electrical ...
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0answers
19 views

CircuitStudio: How to connect zero-indexed buses to a repeat schematic sheet?

The general gist of what I'm trying to do (in CircuitStudio), is the following: In a hierarchical block "input", I generate four signals that are to be fed to an array of sensors, one signal per ...
1
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1answer
58 views

Question about Roland 606 schematic

Hello this is my first post. I have a question regarding the circuit diagram of the Roland 606. I'm currently redrawing the hihat circuit with noise unit. The symbol behind R6, and elsewhere in the ...
1
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0answers
56 views

Help identify RJ11 pins on a relay board - No152133

I'm tinkering with my garage door motor (Marantec Comfort 220) which have a RJ11 6-pin connector (X10) for an accessory relay board. The board consists of three (3) relays driven via the RJ11 ...
2
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2answers
138 views

What is the correct schematic symbol to use for virtual ground?

I'm following the design of a circuit requiring a power supply to provide something the author calls virtual ground, \$V_{gnd}\$. The circuit look like this: However, I'm using KiCad for the design ...
0
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1answer
90 views

Will this capacitive discharge welder design work?

I'm an electronics newbie trying to learn about the subject through tinkering, and my current project is a capacitive discharge welder for welding on battery terminals. I thought I'd better have ...
0
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3answers
91 views

eagle schematic check [closed]

I will do basic IOT project with esp-wroom-32. but I am machanical student. I need to help please check my design. my component: - esp-wroom-32 - button - pad-resistor - locig level converter - ...
0
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0answers
40 views

How does recuperation works in BLDC?

Using BLDC wheels is common on electric transport. A wheel is a multiphase motor, where each phase(coil) is separated from power source(battery) with some kind of transistor, driven by PWM-like signal....
0
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1answer
92 views

Why is this power supply split?

I am looking at a schematic for the Pixhawk 2 board. It has a complex power distribution system (see photo below) Much of the complexity exists for one of two reasons redundancy shutting off ...
0
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1answer
63 views

Connecting an IC to LEDs - would I use a transistor?

I have this breadboard circuit, which is basically a 65C02 CPU that has 16 Address pins. I want to wire these up to LEDs. Below, I've connected them directly, which is likely all kinds of bad (Too ...
0
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1answer
80 views

How to drive 2/3 color LED's and circuit schematic

I need to use 2 or 3 color LED for my circuit.(preferably 3 color one). I am going to use PIC18F26K83 to control the LED. However, I am confused how am I going to make it change colour. I think I ...
0
votes
1answer
30 views

eeschema: prevent Value, Reference from moving relative to symbol library?

When I create a symbol in the symbol editor and then drop it into a schematic, many of the fields (Value, custom fields) are automatically moved outside the bounding box of graphical objects. In the ...
0
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1answer
29 views

How to properly use a shut pin in audio connector to prevent floating pins when disconnected

I'd like to use this RCA jack in a project that detects roughly the volume level on an RCA audio source. The circuit filters out the DC line voltage, amplifies it with a PNP transistor and then shifts ...
1
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1answer
109 views

Understanding 5V to 1.8V UART level-shifting circuit

Hopefully it's OK to ask very basic electronics questions here. I had a TTL 5V UART cable, however the board I had only accepts 1.8V max. So I found some online schematics that uses resistors and a ...
2
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1answer
52 views

What is this contact on a jack socket schematic?

I'm looking for a 4-poles (TRRS) 3.5mm jack socket with integrated switch, and stumbled upon this connector schematic: (this is an extract from the CLIFF FC68129 datasheet) I understand that pins 1, ...
0
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1answer
55 views

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
37 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
731 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 ...
1
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1answer
50 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
votes
1answer
299 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
42 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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2answers
63 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
23 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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0answers
43 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
82 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
30 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
20 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
54 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
95 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 ...
0
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2answers
119 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
54 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
75 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
35 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 ...
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1answer
66 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
137 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
52 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 ...