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Is it normal for a PCB to create a voltage drop at the power supply

I have a few projects restoring old arcade video game PCBs. Some of the boards need a slightly higher voltage (~5V DC) to power all the components (esp. the ROMs furthest away from the power connector ...
Renier Delport's user avatar
0 votes
0 answers
16 views

Disable or bypass all EEPROM alarms in Cannon MP160

I want to separate the scanner from the printer part and use it as a scanner alone. Due to EEPROM commands by default the system checks, if the DC motors are connected, if the inks are present etc... ...
Stefanos Konstantopoulos's user avatar
0 votes
0 answers
21 views

Build a variable current limiter for lead-acid battery charging

My previous question: Limiting the battery charging current / voltage using PWM or MPPT charge controller I have a 12V, 200Ah deep-cycle lead-acid tubular battery which I charge with solar panels. PV ...
Irfan Latif's user avatar
0 votes
0 answers
23 views

Via-Capacitor Placement Strategies for Bypass Capacitors

In the image provided, four different locations for bypass capacitors are illustrated. My query pertains to determining the most effective model for delivering power from the power plane, along with ...
Alirezaagha30's user avatar
0 votes
3 answers
65 views

How are "unique IDs" generated for 1wire devices?

(I previously posted this question on the Arduino SE, but it was downvoted as "not Arduino enough", so I post it here in the hope it will be better received.) If I wanted to make my own ...
Sod Almighty's user avatar
0 votes
2 answers
57 views

Why do linear components make linear circuits?

We can use the concept of linear circuits to simplify circuit analysis (e.g. superposition & Thevinin’s theorem.) In order to do this, we need a simple way to identify linear circuits. I believe ...
Fascheue's user avatar
1 vote
1 answer
34 views

7 contacts 3.5mm jack socket: automatic speaker headphones switchover

Edit: The output is mono on both headphones and internal speaker, despite the new connector being stereo. Original: I only have a mono audio source, and the new socket has dedicated pins for the L/R ...
lupolucio's user avatar
0 votes
1 answer
38 views

Disadvantages of using triac to control inverter load

I'm trying to optimise the usage of a residential solar system. It's a fairly low capacity system connected to the grid with an inverter (no batteries). There is also resistive heater which uses, on ...
David's user avatar
  • 103
0 votes
1 answer
29 views

Why is this extra MUX here when shifting mantissa as part of a FP add?

My textbook (Harris and Harris, Digital Design and Computer Architecture) asks us to design a simplified (in that only positive numbers be considered, with NaN and infinities ignored) FP adder block. ...
EE18's user avatar
  • 1,097
0 votes
1 answer
22 views

Specific DC voltage output from batteries of variable number and strength

I've created a device where up to 24 AA batteries can be connected in series, with a rotary switch determining how many batteries supply the combined output voltage. If all batteries are at full ...
Eric Eggers's user avatar
0 votes
0 answers
33 views

Can I use a laptop backlight inverter as a tube power supply?

I would like to build a circuit that has a magic eye in it. That needs ~290V. I was wondering if I can/should use a CCFL inverter (salvaged from an old laptop) to generate that voltage, maybe driving ...
The Bishop of Canterbury's user avatar
0 votes
0 answers
29 views

Use of piezo disc for fish finder [closed]

I want to make a fish finder with this piezo disc and these discs are used in most fish finder transducers as you can see in the picture. But I don't know how to run it, AC or DC? Maybe there is a ...
Serkan Yilmaz's user avatar
0 votes
1 answer
51 views

I'm trying to make a 2.2 Amplifier, is my schematic correct or suggest any improvement?

This is my project schematic, I'm using TDA2050, and the input voltage is ±12V. Is it correct or does it need any improvement? Thank you very much.
CÔNG NGUYỄN DUY's user avatar
1 vote
3 answers
102 views

Why do electromagnets have itty bitty wires?

In videos like this one by electroboom, people make electromagnets with itty bitty wires. It seems the intuition is more turns, greater magnetic field. But I'm not so sure about that. Suppose we have ...
Joseph Summerhays's user avatar
0 votes
1 answer
21 views

How do I wire a permanent magnet synchronous motor?

I salvaged this motor from a washing machine with a view to using it to power a bench sander in my workshop. There are three wires red,white and blue in addition to the green/yellow ground wire. Given ...
Donal's user avatar
  • 1
0 votes
0 answers
25 views

Why is ds = p*dp*dΦ and not ds = dp*dΦ?

The problem I am having is with ds. I understand the two integral bounds, which are the radius and the 2pi boundary for the circle. It also makes sense with the units to integrate twice to eliminate ...
LordOfChimichangas's user avatar
0 votes
0 answers
22 views

Phase comparator , ADC voltage scaling

Given two disciplined oscillators and a high speed phase comparator, I can read its output voltage vs time and plot it (between two 10MHz square signals arriving to the phase comparator). I will omit ...
Ken90's user avatar
  • 113
0 votes
0 answers
21 views

Rheostat with parallel resistor, how to make the taper more linear?

I'm using a 10k potentiometer wired as a rheostat in parallel with a 470 ohm resistor, because I need a (roughly) 500 ohm variable resistance in a circuit. The type of potentiometer I'm using is not ...
one_three_three_seven's user avatar
2 votes
2 answers
51 views

Powering a Raspberry Pi Zero with a Li-po battery

I want to design a circuit to power a Raspberry Pi Zero using a single-cell Li-po battery (3.7 V). I'm working on a portable hobby project that's required to be battery powered and allows recharging ...
Amir Rachum's user avatar
1 vote
1 answer
55 views

Is making a colpitts of 400+ MHz on a breadboard practical? [closed]

I have been designing a colpitts but it stops working above 300 kHz. Is this due to parasitics in the breadboard? I am using a common emmitter amplifier style colpitts.
help_me_learn's user avatar
1 vote
1 answer
39 views

Second-order RLC transfer function

I solved the exercise in the picture with Laplace: Not being familiar with systems theory yet, I do not understand one thing (circled in pink in the picture.) The transfer function found with the ...
KaleM's user avatar
  • 415
1 vote
0 answers
16 views

Why the induced noise is sometimes additive but sometimes works as a constant?

Why sometimes the noise (e.g., induced 50hz hum) is added to a useful signal (thus increasing its 50hz value), but sometimes it works as a noise floor - has a static value and can be overpowered by a ...
Matilda Bentefor's user avatar
2 votes
0 answers
19 views

Why would a battery have a declared "LSL" ("lower service limit"?) for internal resistance?

LG's spec sheet for the BL-42D1F lithium ion battery (that's the battery that goes with their G5 phone) states: ...
jaimet's user avatar
  • 153
0 votes
1 answer
46 views

Forwarding a clock and display it on oscilloscope

I have been trying to forward 2 clocks, one of them is 12.5MHz, and the other one is 25MHz. when i used an oscilloscope to check the signal, it was not a square wave, and it was like a capacitence ...
Yosh Sinjab 's user avatar
0 votes
0 answers
22 views

MOSFET Driving for a Dump Load Resistor [closed]

I am in the process of building an ac-dc rectifier for a 6 kW small scale wind turbine. Within this I am planning to integrate a dump load resistor to manage overvoltage. At 500 V DC a switching ...
Jasper's user avatar
  • 1
0 votes
0 answers
15 views

PCM to dbspl conversion in esp-idf

using i2s interface of esp32-wroom-32 i am getting PCM data from PDM micro-phone. how can i measure acoustic sound pressure level? below are datasheet sheet of micro-phone from 16 bit array how can i ...
Moaz Azam's user avatar
  • 103
0 votes
3 answers
88 views

PCB design: How small can vias be made?

Working with very limited space (In Altium) and need to place vias to make routes between the red solder castellation plates on the top layer to the respective connector pins on the bottom layer, both ...
eutectic_codswallop's user avatar
0 votes
0 answers
24 views

Detect when at least one analog sensor (of many) is active

I'm building a digital piano. The current design is one sensor per note to measure position, 8 sensors to a mux, with many muxes. I read muxes/sensors sequentially, and I have logic that uses the ...
testing67's user avatar
0 votes
3 answers
55 views

Using a 6 V DC motor for a 3.3 V LED

We are tasked to do a generator with LED for our project. We were given this video as a guide. I am planning to buy a 6 V DC motor to power a 3.3 V LED. Is that okay? Although I have read somewhere ...
Marc's user avatar
  • 1
0 votes
1 answer
61 views

Millivolt logger with high sampling rate [closed]

I'm trying to find modern components for a design that would be able to record millivolt range samples at a high sampling rate (~30 kHz) for ~1 hr interval. Key components I can think of thus far are ...
Keiland Cooper's user avatar
3 votes
6 answers
447 views

Circuit Simulator

I just recently started to study circuits. I have a homework assignment and I need to simulate some circuits, but I don't know what simulator should I use. I was using CircuitLab but as I don't know ...
Nabucodonozor's user avatar
0 votes
1 answer
37 views

LS19-S, what to do with unused inputs>

I am using a LS19-s switch debouncing IC, and the datasheet does not specify what to do with unused inputs. I know for CMOS chips it standard to ground unused inputs and for TTL chips the unused ...
Zackery Fleming's user avatar
0 votes
0 answers
42 views

Timer relay used for power button bypass

I have a small control panel device (controls a separate relay box) that has a simple power button I am looking to automate. You press the top left power button and the panel comes on, press it again ...
Alex's user avatar
  • 1
0 votes
0 answers
53 views

Would tempered glass be a good material to use within this experimental axial flux permanent magnet motor?

I am in the design phase of building an experimental axial flux permanent motor and I am wondering if I should use a piece of tempered glass as both an insulating material and as part of the motor's ...
user57467's user avatar
  • 119
-1 votes
0 answers
32 views

Constant Power Load Simulation [closed]

I am attempting to simulate a highly complex real-world scenario. I wanted to start simple by simulating a variable voltage source (V1) that goes from 0 V to 10000 V, which has a current limit (...
Obriel Lameda's user avatar
-1 votes
1 answer
26 views

Interface Parallel display - ESP32 [closed]

I accidently purchased a 2.4 inch Parallel display for my ESP32. After some reading I noticed that perhaps a SPI version would perhaps have been more simple. Display I am talking about is a NHD-2.4-...
Erwin Preshantram's user avatar
-2 votes
1 answer
48 views

Polarity free dc circuit module [closed]

I am looking for a chip or a circuit module in which the output will be dc voltage in certain pins positive + and negative - , no matter how the dc input is connected, normal +- or or reverse -+. The ...
Stefanos Konstantopoulos's user avatar
0 votes
0 answers
23 views

Adapter compatibility for vintage devices [closed]

I'm using a Canon adapter AD-6II (output 6 V) on a Canon Starwriter 30 Word Processor that requires AD-150 (output 9.5 V). The unit turns on but the screen flickers. Could it be due to the adapter ...
JeanB's user avatar
  • 113
0 votes
2 answers
50 views

GPIO Alternate Function GD32

I am trying to understand how alternate functions work at the register level for the GD32 microcontroller. For example, in the case of the GD32F103, there are several alternate functions available for ...
Andr's user avatar
  • 17
2 votes
1 answer
80 views

Measuring current with a multimeter around a closed circuit [closed]

A question from physics lab: Referring to the circuit you built to measure currents, what would happen if we completed our circuit with a wire and measured the current with the multimeter at the same ...
Dee's user avatar
  • 21
0 votes
0 answers
54 views

How to analyze ideal diode circuit

For the first part of the problem, I have figured out that when Vs = 60 V, Vo is 50 V when D1 is reverse biased and D2 is forward biased. The question also asks to find Vo when Vs = -60 V. This is ...
salsa_24's user avatar
0 votes
0 answers
79 views

Why does one circuit work but not the other in LTspice?

Newb here having trouble. I have two identical circuits built in LTspice. Once works fine, and the one pictured here does not. Note the ??? marks on the drawing, they should be DC voltages. I know ...
Dereck's user avatar
  • 51
0 votes
1 answer
24 views

Analog Microelectronics ASM 5915 pressure/temperature sensor coding problem

I'm trying to use an Analog Microelectronics ASM5915-1000-D pressure/temperature sensor with a Raspberry Pi Pico running CircuitPython. I'm communicating with the device using I2C, and getting data ...
writes_on's user avatar
  • 101
0 votes
1 answer
57 views

Proteus problem the code is correct but the schematic doesn't work when I click on any button [closed]

I've fixed the problem of other buttons but it still doesn't work.
Abir El Abdellaoui's user avatar
0 votes
0 answers
31 views

What is the input impedance of a JFET common drain amplifier at high frequency?

I have been trying to learn how JFETs work. The first amplifier that I read about was the CS amplifier: I found that for a typical common source amplifier configuration at low frequency, the input ...
Analog's user avatar
  • 389
-1 votes
1 answer
59 views

Forward converter current flow confusion

I am slightly confused about the flow of the current in the forward converter during the turn off time of the MOSFET (when diode on left is conducting) as shown below. Now I am considering that n1=n2=...
kam1212's user avatar
  • 593
0 votes
0 answers
23 views

MOSFET drain current ringing in saturation region [duplicate]

I am testing below 500mA constant current sink circuit on test bench which turns on for 1 second and turns off for 7 seconds. During testing ,drain current oscillations of around 80mA were observed ...
Ronnie's user avatar
  • 328
0 votes
0 answers
22 views

DDR3 U-DIMM Signal Reference Plain

I am doing the PCB layout of a DDR3 U-DIMM and I have run into a perceived gap in the JEDEC DDR3 DIMM standards and am hoping to get some input from a DDR3 SME who could clarify the Address/Control ...
joel reindel's user avatar
-1 votes
0 answers
36 views

Why does this trans impedance amplifier oscillate in the below simulation? [closed]

I am interested in why does this transimpedance amplifier begins to oscillate between the two voltage rails? In this simulation an IDEAL op amp is used, so there is no noise to contribute to the ...
LEXOR AI's user avatar
  • 324
0 votes
3 answers
120 views

Could QAM using a grid-like distribution be a quantization limitation?

This is a follow up from this previous question discussing why QAM encoding is spaced in a grid like pattern like this one: versus another with more efficient packing: After looking at @Attie and @...
Joshua Walker's user avatar

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