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.
0
votes
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
votes
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
votes
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
votes
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 ...
0
votes
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
vote
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 ...
0
votes
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
votes
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 ...
1
vote
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
votes
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
0
votes
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 ...
0
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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
vote
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
vote
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
votes
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
votes
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
votes
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
votes
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
votes
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
votes
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
votes
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
votes
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
vote
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
votes
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
votes
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 ...
0
votes
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
votes
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
vote
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). ...
0
votes
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
vote
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 ...
0
votes
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....
0
votes
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
votes
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 ...
0
votes
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?
0
votes
0answers
20 views
ENC28J60 - is this connection correct
Just wondering if this is correct. I never used to design anything using this chip.
0
votes
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
vote
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 ...
0
votes
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
votes
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 ...
0
votes
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
votes
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
votes
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 ...
1
vote
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
votes
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, ...
1
vote
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 ...
0
votes
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 ...
8
votes
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 ...
0
votes
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 ...
