Questions tagged [schematic]
The schematic tag has no usage guidance.
102
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Bluetooth headphone volume, play, pause, skip commands [closed]
I'm building a bluetooth audio transmitter to send audio to a pair of bluetooth headphones. Simple enough using any number of available bluetooth boards on amazon, ebay or aliexpress.
Such as this
But ...
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3
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69
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Low side P-FET usage is opposite of expected, what did I do wrong?
I'm working on a circuit that should close a reed relay (normally open) when TI/COUT is low and open said relay when TI/COUT is high (6V).
I'm using a P-FET low side transistor to ground the relay &...
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1
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L293D motor driver resistor network confusion
I've been trying to modify the original Adafruit V1 L293D motor driver, but have run into a bit of a roadblock when reading its schematic. The text labelling the resistor network has stacked and ...
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1
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How do Altium Designer 20.2.4 Schematic Defaults work?
I'm trying to use the Schematic -> Defaults to predefine how I want every part of my schematic, but I found it a bit confusing.
First of all, I can't make the changes that I want. Now I'm trying to ...
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Schematic Review Request: Controller Circuit
I am a ME, not an EE, so bear with my ignorance please. My schematic probably will make that clear, ha.
I am designing a circuit which interfaces a 12V vehicle system with GPIO on two ...
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3
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How to read this schematic correctly
This schematic will be used to wire a potentiometer and momentary on switch to a welder. The schematic states that there is a cable shield grounded to the connector. Am I correct to assume that this ...
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46
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How to change standard schematic for ambient light sensor TSL25911FN
I am implementing ambient light sensor TSL25911FN into my design schema.
[A]
VCC = +3.3V, SDA_SC and SCL_SC use standar +3.3V logic.
Here is standard implementation of such sensor by producers like ...
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4
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Why is there a polarized capacitor symbol in an AC circuit?
I am confused. My question is very basic, someone please enlighten me.
If polarized capacitors should not be used in reverse polarity then why does every textbook (like the one I am using, Grob's ...
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TMC5160 the outputs signals do not work correctly
I have a Problem with TMC5160.
I use the spi communication and I have measured the signal, they are correctly.
But on Output of TMC5160 I have a problem. My MOS-FETS do not work correct. I measure on ...
2
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3
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Pin Conflict during ERC in KiCad
During ERC, I get these two warnings:
If you take a look at the schematic, these are the problematic areas:
No matter how many Power Flags I place, I cannot seem ...
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First time schematic for USB-C power detection
Hey all I am creating a PCB that allows me to detect when I plug in a tablet, laptop, etc. to my home made tablet organizer. It's difficult to see if it made a connection in the back since you place ...
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3
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I need suggestions/feedback on my simple active balancer schematics for two 12V batteries in series
Since I currently use a 24V battery system for my house using 16 12V car batteries (2 parallel banks of 8 in series with each other) and use the lower 12V side for additional devices, (as well as due ...
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129
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Ammeter showing wrong value
I am trying to figure out why the multimeter is not displaying the right current.
I purchased a bayite DC 6.5-100V 0-100A LCD display digital current voltage power energy meter multimeter ammeter ...
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3
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Looking for a block diagram from this schematic
I'm looking for the block diagram from this schematic. My concern is the multi-feedback. I don't really know how I could model it.
simulate this circuit – Schematic created using CircuitLab
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9 pin npn transmission relay issue
I've visited this site before never posted until now.
I just recently graduated with a bachelors in electrical engineering, and I'm trying to teach myself car electronics. I ran into this 9 pin relay ...
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3
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580
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Reducing 120 VAC to 24 VAC with a 5.1 Ω, 6.5 W resistor
Can anyone provide a schematic drawing to show how to reduce 120 VAC source voltage down to 24 VAC to power a small LED indicator light with a rating of 24 VAC/VDC using a 5.1 Ω, 6.5 W resistor?
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How does electric signal go from point A to point B in this schematic?
I am trying to figure out what path electricity takes from point A to point B.
I assume it will pass trough some transistors, but how exactly, and why?
For example, I assume it somehow gets to TCA671 -...
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4
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How to follow the signal when reading the schematic? [closed]
I am learning how to read schematics.
Are there any guidelines or good practice on reading schematics?
It's my understanding that schematics are read left-to-right and that is how one should follow ...
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6
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Solar seller provided wiring diagram: Is this diagram of any use or unreliable/inefficient?
A solar equipment seller provides this wiring diagram (not mine):
There are three terminals on the solar charge controller: Solar IN, ...
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2
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LM317's based "0-V to 30-V regulator circuit" - what is the purpose of diode on the schematic from TI's LM317 datasheet section 9.3.1?
What is the purpose of the diode in the schematic of the LM317-based "0-V to 30-V voltage regulator circuit" from section 9.3.1 of TI's LM317 documentation?
Schematic:
I simulated the above ...
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2
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What does this schematic symbol mean (rectangle with two tails, "0.44 VCC_IO" on the bottom, "0.56 VCC_IO" on top)?
I've highlighted this symbol from page 30 of the TMC2100 datasheet:
Based on the context, which says "only rising edges are active", I'm guessing it means that a signal is detected when the ...
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Schematic review for my ESP32 based design project
I am seeking some feedback for my schematic. I am designing a wearable device using an ESP32. It is my first time doing a schematic so I might have done some things wrong.
The first image is the ESP32,...
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IF ELSE using N-channel MOSFET
The situation I have is like this. Let's say I have one input A, one switch B and two outputs C and D (with pull-ups). If B is pressed and A is high I want C only to go low but if A is low I only want ...
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I am designing a device using a MCP73871 and I am unsure on how to connect the status pins to the ESP32 MCU
I need a bit of help for my device schematic, more specifically for the status pins of the MCP73871. I am a beginner so I am trying to understand how to do it properly. The pins are PG, STAT1/LBO and ...
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Power schematic for RP2040 & serial resistor amount
I am trying to design a PCB with a RP2040 microchip that is able to communicate with a SpektrumRC reciever over the SRXL2 serial protocol from a JST connection. The board will be programmed over USB ...
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2
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What is this component, and did I make this schematic correctly?
This control board is from a mini-split heat pump. It sits on the outside of the unit and receives signals from a remote control. It's from this discussion here.
It's a single-sided board - am I ...
6
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2
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What are these short parallel lines around a connection line in a schematic?
I am examining the Analog Devices AD74413R and came across a symbol in the evaluation board schematic I am not familiar with. There are small parallel lines around connection lines in various sections ...
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3
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Recommended Design to Schematics [closed]
I'm designing an MCU-based electronic device and have a BOM of the major components (power regulators, MCU, serial communication ICs, etc.).
Is there any piece of software out there that can convert ...
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2
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432
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How do I wire a new digital ammeter/voltmeter to my power supply?
I would like to replace the voltage and current analog meters on my Topward 2300 bench power supply with a newer digital one (DSN-VC288)Datasheet. Unfortunately, I'm very confused about how to wire it....
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How can I find the differential pair impedance value of an ic CH559DS1 [closed]
I'm trying to make a PCB layout using Altium, schematic is done. Now I'm trying to find the value of differential pair value which is required to calculate trace width and clearance. But this value is ...
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254
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Altium Designer schematic rename multiple pins' reference designators and names
I have two connectors, each with 52 pins.
I am looking for a way to rename the second connector's pins with the following formula.
Pin_Designator_new = Pin_Designator_old + 52
I know if I select each ...
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Unusual symbol on schematic
What this is symbol? It's in series with a miniature incandescent lamp and I do not recognize it.
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231
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Is this the right way to connect the grounds?
I learnt that the digital (microcontroller), analog (ADC reference) and power lines (For motors) have to have their own seperate areas when it comes to partitioned ground schemes. In an application, A ...
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1
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195
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ESP32MINI + MCP2221A + 3.3v, 5v, and 12v power supply circuit problems
I'm trying to design a circuit with an ESP32-Mini that connects to a CAN bus via an SN65HVD230. I've added an MCP2221A as a USB/UART interface to the ESP32 so that I can program the chip while on ...
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ORCAD: How to automatically change net alias when cut paste circuit blocks
I have couple orcad capture schematic design-related query. I'm on Orcad Capture CIS 17.4
First
When I cut and paste a circuit block, the net alias rename the same.
Is there an automatic way to have ...
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462
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Creating a new schematic for an existing PCB in Altium
I'm pretty new to Altium (I'm used to Eagle) but I've been given the task of cleaning up an existing project. The project was originally one schematic and one PCB that would serve as two parts of an ...
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3
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Current monitor/sense circuit
Has anyone ever dealt with a circuit similar to the one I have? It is a current sensing circuit but I do not understand how it works. I believe there will be a voltage difference between my R2 and R3; ...
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501
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Altium Designer schematic opening error
Sorry about that I am asking this question here, I had designed a schematic before in previous version of Altium Designer after fully uninstalled 20.2.7 version then I updated my Altium Designer to 22....
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1
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4-20mA ADC, HV DC measurement & DC/DC PSUs schematic validation [closed]
Hello i am designing a small Li-ion battery charger based on an custom generator which produces 36v DC output and i have designed a PCB that controls the whole procedure and logs the measured data to ...
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1
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What is pinout of JFET in schematic. Is pin 1 really gate?
In the following schematic the J310 part, Q5 and Q6, are shown rotated.
If so shouldn't the pinouts show the gate as pin 3 instead of pin 1?
I thought he pinout of a J310 was 1-drain 2-source 3-gate.
...
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What does a capacitor marked "105 | 47 μF" mean?
Attached schematic for the e-Paper driver HAT.
The meaning of the yellow marked part is not clear to me.
Does this mean I can replace 105 (1 μF) with 4.7 μF and use either as available?
The entire ...
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Cadence Virtuoso Schematic: Input pin goes to 2 different nets
I have a silly problem regarding input pins connecting to 2 different nets of a circuit in cadence virtuoso. Due to non-sharable agreement, I cannot share the actual circuit. But I can provide simple ...
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AOZ2264 not starting up
I am struggling to find a reason why the AOZ2264 won't start up. I am using a 5V regulator to power the VCC pin on the AOZ2264
Find the schematics which I am using for my PCB. Not sure if there is ...
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Schematic Notation
I am reading a schematic to find the current leak of my car battery.
What is the dotted line between the top of fuse 6 and 17?
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Does anyone recognize this schematic symbol? (Ethernet connector)
The symbol I'm looking for is the one inside the circle of the schematic. I thought it could be some special kind of fuse, but I haven't seen anything like this before, nor been able to find anything ...
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Transfer function. FACTs method
I am trying to use the FACTS method to find the transfer function expression. Could you explain how the resistances Z1, Z2 and Z23 are determined from figure 5.101?
If we consider Figure 5.101b, we ...
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Which type of MOSFET is required to supply enough current to activate the coils?
I am using a NPN-PNP Transistor couple to act as a switch for activating the desired coil of my relay. If the H/L pin is in HIGH state, COIL1 must be supplied with 3.3V and if LOW, COIL2 must be ...
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Are these contacts grounded?
This is the schematic for the Magnavox Odyssey.
Looking at some of the "GAME CARD 1" connectors, can it be assumed that 9, 38, 28, 42, etc, are simply not connected?
In other places, "...
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2
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LM10 schematic transistor symbols
I'm trying to figure out what certain elements of the transistors from the schematic in the LM10 datasheet represent and I hope someone can help. In the attached image I have several questions:
In ...
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Is there a convention for documenting a schematic with notes?
I want to add an explanation as to why I’ve done something a certain way (mostly for my future self) on my schematic. Yesterday when reviewing a circuit from last year, I asked myself “why the heck ...
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