All Questions
192,870
questions
2
votes
2
answers
23
views
How could I implement PDIP8 PIC controller to PCB so I could remove it?
Basically I would like to not solder it in place - so I could simply remove it for reprogramming. Is there breadboard-like PCB solderable component which let me stick MCU to it and then easily remove?
...
- 773
1
vote
0
answers
16
views
In open delta connection, when one transformer stops working, do the other 2 transformers give 2 phase current?
In open delta connection, when one transformer stops working, do the other 2 transformers give 2 phase current or 3 phase current (and why 3 phase current not 2 phase current?) and if so why can't we ...
- 11
1
vote
0
answers
20
views
Why does switching the winding direction on transformer give me a better conducted EMC meassurment?
I am making a charger and I am measuring conducted and radiated EMC.
The circuit is a flyback and the transformer in mention is a sandwich style transformer with 4 windings. Primary windings, ...
-1
votes
2
answers
47
views
How to implement a solid-state non-volatile switch?
I found this heavily downvoted question about how to implement a non-volatile switch (i.e. a switch that remembers its last state even when power is removed). While the OP asked the question in a ...
- 2,614
0
votes
0
answers
28
views
PCB Adapter for different signals
I need to use a connector that only exists in a version for PCB installation, but I have to connect it to a cable; so, I was thinking of making a small adapter PCB on which to directly solder the ...
- 736
1
vote
0
answers
52
views
What’s the difference between soldering iron wire wools?
What is the difference between the two different coloured wire wools for cleaning soldering iron tips?
Both are being sold online by many sellers and both claim to be made from copper.
Is one better ...
- 513
0
votes
0
answers
32
views
What Exactly Is Meant by a 2nd Order Phase Locked Loop?
I'm teaching myself about polyphase clock sync for demodulation of OQPSK. An article from gnuradio.org entitled "Polyphase Clock Sync" makes references to a 2nd order loop. The context seems ...
- 489
0
votes
2
answers
41
views
Charging battery with constant voltage and current, with DC power supply
This question is for a general case.
Is it possible to charge a battery (any voltage, any components) with constant voltage and current with a DC power supply.
For example: charge a 12V 100Ah with 13....
0
votes
1
answer
28
views
How to understand the "zero source impedance" in LISN insertion loss calibration
50 uH LISN Diagram
Input impedance of the LISN varies with frequency from 5Ω at 9 kHz to 50Ω at 30 MHz
In Page 27 of Calibration and use of artificial mains networks and absorbed clamps, it says:"...
-2
votes
0
answers
23
views
Question related to damping, quality factor and natural frequency of the system
If the G(S) is as follows:
Then how would you calculate the value of undamped natural frequency, damping factor, and quality factor of the system?
-2
votes
0
answers
26
views
Motherboard rebuild [closed]
I am Likla from Manipur, India. I actually am a beginner mechanics and I'm doing graduation in electronics. So I got a phone (redmi note 10 pro) of which the software got problem after an update. I ...
- 1
0
votes
1
answer
47
views
In Bode plots what does phase tell us for passive filters (open loop)?
I was just playing around with a passive filter to erase some noise - one that should work between 80MHz and 1GHz.
I'm aware that the phase in Bode plots gives data about the time delay between the ...
0
votes
1
answer
31
views
Cabinet fan location
I have a wooden lowboy entertainment center with 21”W x 21”H x 21”D cabinets on either side. I’d like to install a fan in one cabinet to provide airflow for small electronics, specifically a Wi-Fi ...
- 1
1
vote
1
answer
39
views
Routing traces underneath impedence controlled traces in 4 layer PCB
I am working on 4-layer PCB with following stack-up:
Layer-1 Signal traces
Layer-2 Ground
Layer-3 Ground
Layer-4 Signal + Power traces
The PCB contains ESP32-S2 MCU with USB and chip antenna. I ...
- 35
0
votes
0
answers
38
views
RLC circuit split into two circuits RC & RL after the switch is closed
I have the following circuit (old exam question) that asked to find \$i_{C}(t) \geq 0 ,i_{L}(t) \geq 0 \$
For \$t <0 \$ the switch was open. Therefore the inductor behaves as a short circuit and ...
0
votes
0
answers
34
views
Changing an output signal
I need a way for the rotational hall sensor that outputs 0-5v to be centered at 2.5v and if it goes below 2.5v the output rises. If it goes above 2.5v the output adjusts down.
My goal is to have it ...
0
votes
0
answers
30
views
Battery Charger only works after inverting the terminals [closed]
Apologies, I am not an electrical engineer of any sort, but I am trying to fix a charger for a set of 7.4v Li-ion 1.6 Ah/12Wh batteries. The soldering all looks good, but the charger is unresponsive ...
- 101
1
vote
2
answers
42
views
Could a device connected to one MCB/phase affect a device on another MCB/phase?
I have a 3-phase 230V residential supply. It's divided among 3 groups of MCBs all powering single phase devices.
The problem I'm having is that whenever the air conditioning (single phase) turns on ...
- 147
0
votes
0
answers
38
views
Which tool would be easier to create Gerber file for a beginner? [closed]
I wish to design some PCBs for my hobby circuits. Which tool would be easier to create Gerber file for a beginner?
- 101
0
votes
0
answers
37
views
Voltage selector (power circuit)
I'm looking for an electrical diagram so that from a digital input (0-5V) and a control input S0 which takes logic signals (0-5v) I can deliver 0v volts at the output (if the digital input is at 0). ...
- 51
0
votes
0
answers
103
views
Why do I have units of μA instead of mA and mV instead of V? [closed]
If \$I_{set}\$ is set to 10mA, why do I get I get 10 μA on the ammeter and not mA if it should be the same current flowing in? Why do I get 10.1 mV on the voltmeter? Both of these are multimeters.
0
votes
0
answers
33
views
How can I electronically measure the load of an AC transformer?
I'm wondering how to electronically measure the load of an AC transformer at the output of the secondary winding. I don't want to calculate the core size but use a measurement instrument - which one? ...
0
votes
0
answers
31
views
ESP-32: transport_base: esp_tls_conn_read error, errno=No more processes
I'm trying to use the async request of esp_http_client. I have the following setup.
...
- 343
0
votes
1
answer
26
views
USB-C PD + USB 2.0
I am looking to power homebrew computer designs with USB-C. I have previously used USB-B micro at 5v and the current limits there haven't been a problem but when building analog circuitry (a sound ...
- 101
0
votes
0
answers
22
views
Altium throws unjustly creepage violations
In my project i have several rules set for creepage. I get 12 violations on this rule, but always between the polygon and a pad or via.
This is strange because the polygon is drawn by Altium ...
0
votes
0
answers
45
views
What is the graphing tool used for datasheets? [closed]
I am making a datasheet for a circuit I made as part of a university project. I want my graphs to look professional so I want to use the tool that big companies use. I have looked everywhere but I ...
- 1
0
votes
1
answer
42
views
Need a support to find out "how fast the MOSFETs (Sie882DF) can switch"
I am using Power MOSFET from Vishay part number Sie882DF to operate at linear region, Following are the steps I have followed to determine the switching speed,
Datasheet electrical spec:
Sie882DF ...
- 1,303
0
votes
0
answers
12
views
How can I rename Altium Library file and apply source change for each component?
I want to change the name of the library files in my Altium Project (inside the folder "Libraries" you can find .SchLib and .PcbLib). I can righ click them and select the rename option. That ...
1
vote
3
answers
165
views
Audio amplifier design using an amplifier to pick up the microphone output and drive an 8Ω speaker for a 4W output
I am studying analog circuits and see a problem in my textbook (Sedra.)
In the problem, I want to make an audio amplifier to pick up the microphone output and drive an 8Ω speaker for a 4W output.
In ...
- 11
0
votes
0
answers
31
views
Converting this boolean expression to NOR only expression
I was given an expression which I simplified using k-maps to obtain the following:
~WY + W~YZ + ~W~X~Z
I followed along with some of the other workings people have done for converting functions, but ...
- 1
0
votes
0
answers
30
views
Microcontroller for high speed ADC and large data storage or how to?
I need to sample a voltage signal at relatively high speed (approx. 1 Msps max). So far, STM32H7 series looks good for this. There are two problems I am facing here.
The total data reading time is ...
- 121
1
vote
1
answer
77
views
Identify electric object
Can you please help me to identify the red and yellow object in the image I think it's transformer but it doesn't make sense to me in the complete circuit it has five pins two on one side and three on ...
- 11
0
votes
3
answers
68
views
Will relays benefit from protection in form of a flyback diode?
If an inductive DC load is controlled via a relay, would that relay need or benefit from a flyback diode for protection from the loads off switching voltage spikes?
Note that this is not about a diode ...
- 668
0
votes
0
answers
22
views
Can you use a BTS7960 43A module as driver for a SPWM tranformer inverter
I have a crazy idea, the BTS7960 43A is a PWM motor driver module. It's maximum PWM frequency is 25Khz, and the build in MOSFETS have a quite low RDSon. So I was wondering if I can use this module as ...
- 51
1
vote
3
answers
57
views
Controlling relays from two voltage sources?
I have two separate voltage sources that I would like to control a couple of relays with. The first source is a 14V DC signal being sent by another device under certain conditions.
The latter is a 5V ...
- 125
0
votes
0
answers
24
views
Looking for direction in creating a Control system model, for a luminance measurement spray painting application
My company is trying to automate spray painting acrylic panels. Currently these acrylic panels are spray painted manually by an operator, and then the finished product's luminance is measured using a ...
- 3
1
vote
0
answers
25
views
Bypass the controller on a 2-wire multi function LED string
I have a halloween LED light decoration that I would like to simply turn on and show a solid light color whenever it has power, however it comes with a switch that goes through multiple flashing modes....
- 113
0
votes
0
answers
25
views
Will inserting a coupling capacitor into a 3-resistor mixing circuit allow it to still act as an AC voltage divider in the same way?
I'm working on a modified guitar amplifier circuit; the amp originally had 2 channels and I've reduced it down to one. At one point in the circuit, there's a mixing circuit where the (original) two ...
1
vote
1
answer
40
views
How can I run iot devices on batteries effectively
I am trying to make a gift for someone and I want to make a little thing that displays a cute message whenever a number is texted. I know how to connect an esp8266 to an AWS system so that messages ...
- 199
0
votes
0
answers
49
views
Electronic circuit components Specification [closed]
I am still a beginner in the field of electronics.
I want to know how to determine component specifications from the following alarm circuit picture.
0
votes
1
answer
54
views
Analog circuit for obtaining a phase shift of 1-2 s in an arterial pulse wave signal of period 1-2 Hz
I am trying to design an analog circuit using an operational amplifier to introduce a phase lag of the order of 1-2 seconds in an arterial pulse wave signal (photoplethysmogram or PPG for short) that ...
- 1
-2
votes
0
answers
58
views
Faraday Iron Ring Inductor Experiment question on magnetic field [closed]
How does Faraday's Law of induction and the Lorentz Force Law apply to the experiment pictured in A? From what I understand Faraday's Law is derived from it. I understand Faraday's Law can be ...
- 115
0
votes
1
answer
30
views
How to make a PI attenuator with a smaller rate of change of attenuation factor?
I made a pi attenuator with R1 = R2 = 1.2 MΩ and R3 = 1.45 MΩ. When supplying 5.2 V peak-peak at a range of 200 kHz-1 MHz, the rate of change for the attenuation factor is very large. What can I do to ...
-1
votes
1
answer
71
views
Stage of Amplification In BJT [closed]
For a common emitter current amplifier, at what point, stage, or junction does is applied current amplified?
- 331
0
votes
0
answers
15
views
How do I locate/upgrade circuit breaker or current sensoron my pcb [closed]
I upgraded dc motors on my childs Ride-on toy from 550 to 775. They are running on a 24v platform and the 775 motors are rated to handle 24v+. After installing them and connecting everything I find ...
- 1
0
votes
0
answers
56
views
Are there any UNIX or LINUX compatible circuit boards that are made in the Americas? [closed]
From searching I've found some companies that make circuit boards in the USA,
https://auroracircuits.com/
https://easypcbusa.com/
https://www.4pcb.com/
However, ...
- 109
0
votes
1
answer
41
views
Unusual Transconductance Equation
I am a math-heavy electronics noob, and I was reading a paper when I came across this equation:
$$g_m=\frac{2 I_D}{\left(V_{G S}-V_{T H}\right)}\left[1-\frac{1}{2} \frac{\theta_1\left(V_{G S}-V_{T H}\...
1
vote
2
answers
68
views
How can I fix this broken RF connector?
I have a broken RF connector. If I soldered it in place, would that work? I am not an engineer and don't know if it needs ground or soldering the connecting interface together would work.
- 11
0
votes
0
answers
30
views
Changing out Piezo disc for LDR in cheap Halloween animation [closed]
To start I am just an amateur when it comes to these things, so please keep answers simple.
I have a bunch of Halloween Animations that use piezo discs to make them “turn on”. They all have been ...
1
vote
0
answers
55
views
Wrong plot for Ids for output characteristics (MOSFET), does new graph look reasonable?
EDIT: This is not a duplicate of 'Wrong graphs for Ids'. That one focuses on the transfer characteristics, while this one addresses the output characteristics. This distinction was also mentioned in ...
- 31