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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41 views

Voltage drop from a logic gate?

In the following schematic with a logic-AND gate: I would expect that since the inputs are logic-high of 5V for both input A and input B, that the output would also be logic high at 5V, yet it looks ...
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2answers
33 views

Emulating Logic-AND gate

The following is an image of the AND logic gate from electronics-tutorials and my representation of that in EveryCircuit, where I've used the "Logic input" as the A/B inputs on the left (equivalent to ...
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48 views

Logic gates in a schematic

The following is an example of a Logic-And gate using two spst switches: What is the most common schematic to show a logic-and gate (without the symbol itself)? I have come across various schematics ...
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1answer
96 views

Unknown schematics

I'm trying to open some circuit schematics for some equipment I have in my lab. However, they were designed some time ago (2013) by an unknown technician with an unknown program. There are two folders,...
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2answers
53 views

OrCAD Schematic cleaner option

I am using 16.6V Allegro.Is there any option on OrCAD Capture CIS for beautifying Schematic? For example, say, I have entered a schematic with irregular wires and used long wires. Is there any ...
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1answer
45 views

Labeling terminals and junctions in a BJT

The following schematic (sorry for the poor picture quality) was part of a question which asked to calculate \$\alpha\$, \$\beta\$ and \$V_C\$ for the given circuit. simulate this circuit – ...
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1answer
79 views

Converting a schematic to a graph [part 3]

This is part 3 in my journeys to try and graph a basic resistor circuit programmatically (part 1 and part 2. I think I have finally figured out how to treat components -- which if I looked at any ...
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3answers
59 views

Trying to understand schematics of a microcontroller (TM4C123GXL)

I have a TM4C123GXL microcontroller with a hwllo-world app. that makes some LEDs to blink. I have done this 'hello-world' by following a tutorial, but now I want ...
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1answer
51 views

Help identifying components in schematic for HT9032

I'm new to electronics and hoping to make a caller ID interface using an HT9032C or HT9032D to do the Bell 202 FSK demodulation. However, I'm having a problem understanding the example application ...
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0answers
35 views

How to decode front end circuit of Red Pitaya STEMlab 125-10 board? [duplicate]

I need to decode the amplifier part and filter circuitry of the Red Pitaya STEMlab 125-10 board. I took these closeup images and I have an actual board. I have got the chips being used on the board ...
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1answer
53 views

Weird RC time constants for possible debouncing

I am modifying a CTK-450 keyboard (manufactured by CASIO) into a MIDI controller. Going over the schematics, I found the way the keyboard CPU reads the keystates, which is rather simple. They are ...
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3answers
105 views

Leads of a particular electrical component

Is lead the most common term used in electronics to indicate the number of connectible input/outputs that a component has? Are there other terms that are used ...
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1answer
75 views

Converting a schematic to a graph

This is a follow up to the question about I posted last night, Converting a schematic into a graph. From some of the answer, I was able to re-work how the graph is done -- with components as edges and ...
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2answers
61 views

Converting a schematic into a graph

I've been working for some time trying to figure out how it might be possible to translate a schematic into something like a node graph, where each node is a component. I've taken some liberties in ...
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1answer
41 views

Node analysis: estimating variable current branches

Is there a way to get the number of potential currents that could be in a circuit? (Note: in the following circuits ignore the Resistor value, I've just added a resistor with the default schematic ...
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1answer
29 views

Multicell overvoltage protection with op amps, how to get rid of oscillating behavior?

Still a beginner in analog electronics, so excuse me for being inaccurate. Also I am playing with circuitjs@falstad.com which might not be the most accurate sim... I wanted to provide a very sharp ...
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4answers
44 views

Estimating current when voltage drops > voltage input

Let's say I have a circuit with a 5V battery and a 2V LED and a 100 ohm resistor. Ignoring certain properties of an LED, I can estimate the current by doing: ...
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2answers
47 views

Solving for current with voltage drops

Given the following circuit: Why is the current through the circuit 34.7mA instead of 35 mA? My thinking was that: The LED draws two volts, so it effectively makes the battery 7V instead of 9V. ...
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1answer
61 views

Equivalent drawing of a parallel basic circuit

I have the following circuit in Everycircuit: Ignoring the component values, when I try plotting this in a network graph, I get something like this: Are these two circuits identical? I suppose the ...
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1answer
22 views

Connecting terminals to transformer on Power Inverter circuit LTSPICE

I am simulating a Power Inverter circuit using LTSpice, but I am confused as to where the corresponding terminals from the resistor and mosfets go. I am trying to simulate this circuit: Based on the ...
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0answers
61 views

Red Pitaya amplifier part schematic

I am trying to replicate the front end design of Red Pitaya Stem 125-10. They haven't provided the complete schematic part. Has anyone tried to decode the rest of the schematic part?
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4answers
113 views

minimum-working example for schematic diagram of a compressor

CONTEXT My son recently noticed that the lights dimmed when the refrigerator turns on. This question has been posed elsewhere [1]. The responses in [1] do not meet my needs. In my humble opinion, ...
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0answers
49 views

Fuzzy digits when driving with TPIC6B595

I designed a schematic and PCB of a simple Nixie clock and I hope that someone will be able to explain what's happening. The problem is that when I'm driving the cathodes with TPIC6B595 shift ...
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3answers
41 views

Convention to label components in a circuit

Given an un-labeled schematic like the below, is there a convention on how to label the various components? For example, would the 'top-left' resistor be R1? Would the one to the right of it be R2, ...
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3answers
72 views

Different 'connection types' between components

Is there a name for the different types of connections between components? For example in the following: Point A is connected between two components -- a battery and resistor -- and so is in series. ...
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1answer
2k views

What are the various 'properties' of a diode?

I have come across various properties of a diode, phrased differently in different places (product sheet, everycircuit, etc.). For example: The wavelength is the simplest and that is the color of ...
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2answers
63 views

Possible ways to represent a circuit schematic

I have the following circuit with a 9V battery and two resistors, R1, R2, in parallel. Here is how it looks: Are the following three ways all valid ways to represent this circuit? Explanation: In ...
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2answers
95 views

Making a 'graph-like' circuit schematic

I would like to make a parallel circuit with two resistors to most-closely resemble how a 'graph' would look, for example: However, when I try doing something like this in Everycircuit it fails (...
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1answer
60 views

What is the point of the pull-up resistors for rows on this schematic?

I am looking through a schematic of a keyboard. It for some reason has pull-up resistors on row lines. Meantime the firmware it uses suppose to iterate over rows by bringing them up from the ICs own ...
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0answers
16 views

Help with reading a scheme for car locking control box peugeot 306 1997 [migrated]

I have Peugeot 306 from 1997 and I have a problem with the locking system. When I'm trying to lock the car it attempts to lock all doors, but then immediately unlocks all doors. I had a problem with ...
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1answer
42 views

Custom STM8L dev board not working

I designed a dev board for the STM8L151F2, and even using an external programmer and external power the STM8 has only been able to be programmed twice. Here's the schematic, everything done in eagle. ...
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2answers
89 views

Small electronic project kit

I ordered this electronics project kit which consists of a small PCB. You have to solder the components onto the board. The components are: Two 510 ohm resistors (green, brown, brown) Two 33k ohm ...
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1answer
104 views

Circuit/schematic review ATMEGA328P

Could someone suggest a place where I could request people to look over my schematic/board design? If this is the place, here it is: https://easyeda.com/be.mihai22/project-hawk EDIT: As I see ...
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0answers
50 views

Wiring a Mosfet for Pulses

BACKGROUND: For sometime now I've been in need of a pulsed power supply that can put out 200 V pulses with a minimum pulse width of 400 nS. After researching effective switching devices, I decided ...
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43 views

Altium symbols/footprints for components with multiple physical parts

What is the best way to build/use Altium (or other software) parts that have multiple physical pieces. This could be multiple footprints that work as a set, it could be multiple MPNs that form an ...
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0answers
13 views

net class management in ORCAD CAPTURE

I am currently building a hierarchical schematic in Orcad Capture. I understand that when nets from different schematics sheets are connected together in the hierarchy, they are added to a "flat net"....
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1answer
62 views

Review of my LED spinner Schematic

After a few months of questions and modifications to my design. I have what I believe to be a LED Spinner that can change the speed of the spinning LED. Before I send this design off to get printed on ...
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0answers
62 views

Manage clearence trough schematic in Altium Designer

I have a multilevel project to measure different potentials and current. This is done by opto isolated amplifier. The design is similar to the image: The sheet is reused in upper sheets multiple ...
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1answer
120 views

Kicad Eeschema window does not respond when opened in windows 10 (Not working)

I have just started with Kicad. Never used it before. I downloaded and installed kicad, opened it, created a new project. Everything is fine until that point. But when I open Eeschema window for ...
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5answers
9k views

Can we ground all the nets in a printed circuit board?

I am a newbie in electronics and I am designing a printed circuit board. The IC I am using has some pins that I don't use in my circuit. Is it okay to ground those nets or leave them as they are? I ...
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3answers
2k views

555 timer frequency is way off

I'm currently designing a 555 timer to provide a 38kHz square wave to drive an IR LED as part of a beam interrupt detection system. This beam interrupt is a part of an embedded product where we ...
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1answer
68 views

Signal 'bounces' back to high

I transmit a signal using LVDS over a CAT6 ethernet cable. However, instead of coming through clean, it always 'bounces' back to the high state: (Pink is the input and yellow is the output) (Sorry ...
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2answers
181 views

what is the diffrence between 5 VDD and 12V on this pin out diagram

I have this wifi module that i pulled from my dishwasher. On the pinout directions it says 5vdd and 12v im confused on what this means. what is the input power that is needed
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2answers
149 views

Why is this boost converter application circuit done this way?

The schematic below comes from boost converter AP6714 datasheet - so I assume it's good, but it is very atypical. Most (all that I used) of the impulse power converters have VOUT connected to the ...
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1answer
85 views

Schematic suggestions for a beginner

(From a complete beginner) I've had this idea to build my own keyboard from scratch for a while, and I finally got the time (and motivation) this winter break to go ahead and try it for myself. After ...
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1answer
36 views

How to delete graphics from PCB board view in Eagle?

I am making my first PCB, and I have a numpad and a 16x2 LCD in the schematic. When I go to make the board, it also brings in the graphics along with the pins, but I will not be soldering them ...
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0answers
31 views

What is the industry standard reference designator prefix for a PCB mount EMI shield

Is there an industry standard electrical schematic reference designator prefix for a PCB mount EMI shield. And if so, what is it? I am creating component libraries for my CAD tool. I created a ...
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1answer
92 views

Would the diode and the fuse protect the other components if power wiring is reversed?

Would the diode and the fuse protect the other components if power wiring is reversed? Is the polarity of the diode correct?
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3answers
60 views

How to choose the appropiate analog power supply filter inductor

I'm currently studying designs for a pulse oximeter for use with Arduino, I have seen two Schematic designs form the same company, https://www.protocentral.com/sensors/1113-protocentral-afe4490-pulse-...
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1answer
56 views

What is this red mark that resembles a net bridge in circuit diagrams?

What does the red mark on this schematic mean? I think it's not a net bridge. The corresponding image was taken from the IO board of raspberry pi compute module 3. Link to the diagram: https://www....

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