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1answer
46 views

crystal stability gone wild on higher speed microcontroller

I made a board with AT89LP52 (higher-speed brother of AT89S52) and at the crystal connection I used a 22Mhz crystal with 5pF NPO ceramic caps grounded. The circuit itself works along with the ...
0
votes
1answer
50 views

How can I power a 3.3v circuit with a 9V power supply and two AA batteries?

I have a circuit that runs on 3.3v. I want it to be able to operate on two AA batteries down to about 2.2v (or until batteries are dead), and also with a 9V power supply. When the power supply is ...
0
votes
1answer
21 views

Building DIY TrackIR, need wiring help

I'm attempting to build a homemade head tacking unit for use in computer games using infrared LEDs for my kid. I followed one tutorial where they were wired in parallel. After doing more research, I ...
0
votes
1answer
26 views

Does magnetic flux depend on the orientation of the ferromagnetic rotor?

I have attached a picture of a reluctance motor setup. When I turn on the AC source, magnetic flux lines will build up. My question is, will the magnetic flux will be a function of the angle turned ...
0
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0answers
35 views

Pocklington's equation - how to get \$\omega\times\epsilon\$ without knowing frequency?

I'm trying to think of how to get \$\omega\times\epsilon\$ here. It must be simple, just missing something. I know the length of the wire in terms of lambda, the radius, and the voltage on the wire. ...
2
votes
1answer
80 views

STM32: SPI hardware to implement custom serial interface

I want to implement SDLC communication on an STM32 (assume I can pick any one up to M7) using the existing HW in it. SDLC is a full duplex synchronous serial interface. In my case, it uses ...
0
votes
1answer
46 views

Help to identify an uncommon thermistor

I am trying to identify a thermistor that was used in a "smart thermostat". It is a surface mounted small part (0603 form factor), bears no markings. I measured the resistance across at a few ...
-1
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0answers
35 views

Painted PSU and Case - How do I connect my Anti Static Strap? [migrated]

I'm purchasing an anti static strap due to my house being all carpet. My case (https://www.amazon.com/dp/B07H4V9T9R/) and my PSU (https://pcpartpicker.com/product/8P7CmG/evga-bq-500w-80-bronze-...
0
votes
2answers
28 views

What terms to differentiate between a quasi-synchronous motor (eg an induction motor ) and a completely asynchronous motor (eg a universal motor)?

I am editing a table of motors. I am looking for the correct terms to distinguish two types of motors: motors whose speed is less than the AC frequency (all inductions / squirrel cage motors) from ...
0
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0answers
37 views

How to turn on 9V water pump when fire detect using arduino uno

I want to write a program that detects fire using fire sensor and on the water pump.Simply on the waterpump when fire detects and goes off when fire is not detected. the fire sensor works fine when i ...
1
vote
1answer
97 views

What is the proper term for a board that replaces a chip?

I've been working on some vintage electronics lately. In the course of this work, I've found that in some cases it is much easier to design a circuit to replace an old DIP chip that has failed than ...
1
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0answers
32 views

Standing waves modes inside a cavity resonator

Follow up postI have researched the concept of a rectangular cavity resonator and have come across the term modes. For a given frequency one can have multiple modes. What do these multiple modes ...
0
votes
3answers
69 views

PIC12F508 “Calibration value is invalid”

We use PIC12F508 chips by the tens of thousands. We normally purchase from people like Future Electronics or Arrow. However, I see that our purchasing people are now buying 12F508 chips from someone ...
0
votes
2answers
81 views

Power supply circuit capacitor selection

I'm planing to use this circuit for my op amp test but I don't understand capacitor selection Why C1 and C2 selected 2200 uF but C3 and C4 selected 1000 uF? (C3 is 1000 uF picture is wrong) I tried ...
0
votes
1answer
37 views

Is this circuit for Piezo Transducer sufficient? [duplicate]

I want to drive this Piezo Transducer (https://www.mouser.com/datasheet/2/670/cpt-9019s-smt-1310960.pdf) directly from a pin on my STM32F0 microcontroller. I don't want to use a BJT transistor because ...
0
votes
1answer
38 views

PWM frequency and sine waveform generation

I am trying to follow some guides (for instance this) to generate some analog signals (for instance a sine wave of 50 Hz) with Arduino (but my questions are general). But I have two basic questions: ...
0
votes
3answers
105 views

Is there any memory cell that can store more than one bit?

SRAM, DRAM, Flash, EPROM - all of the memory cells contain one bit of data each. Is there any memory cell that can store more than one bit, e.g. 2 bits/4bits?
0
votes
1answer
32 views

Calculating steady state output using Laplace transform

I've tried to obtain the the steady state output with the help of final value theorem and multiplication properties of Laplace transform.But I'm not sure whether I've solved the problem correctly or ...
1
vote
1answer
80 views

How does such an USB step-up 5V-12V work?

I just bought a cheap USB 5V to 12V step up converter: Surprisingly, it works very well. There is few place for electronic components (maybe in the USB connector?), how can we do a 5V to 12V ...
-1
votes
1answer
80 views

Which has longer response time: a digital signal processing on arduino or arduino with a filter circuit?

I am interested in knowing which method has a faster output: Method A: Arduino takes in 3V signal with a noise of 120Hz noise. The noise has an amplitude of 800mV. The Arduino does a digital signal ...
0
votes
1answer
40 views

VHDL : Not understanding Hierarchical or External Naming or how to use them

Note: I using quartus ii v13 with vhdl 2008 I am trying to access the current state of my state machine from inside my test bench file. From my understanding I should be able to do this with External ...
1
vote
2answers
39 views

Finding Charge of a battery without knowledge of prior charge

We have a battery connected to some circuitry. Currently, we have all charging of the battery going through a LTC 2944 sensor, and all discharging going through another one of those sensors. We are ...
1
vote
1answer
47 views

Creating a 5 volt (ish) power pack from 18650 batteries

I want to create 5V power supply for a portable lighting project, using 18650 batteries. The power supply needs to provide power to an arduino (which can take 3.3V to 13V input) and some addressable ...
5
votes
2answers
140 views

Visual understanding of EM fields within a rectangular metal container

I have the following scenario setup inside a rectangular metal container. The container size is 12.03m by 2.39m by 1.84m (lxbxh). Additionally, inside the container I have placed 4 antennas equally ...
0
votes
0answers
63 views

How can one make a low cost but high powered UV light source [on hold]

I need a strong UV light source with a peak at 365nm. I know they have lamps systems for this purpose, but they are thousands of dollars. I am going to use this for cross-linking hydro-gels that are ...
0
votes
1answer
32 views

PISO buffer for the MachXO2

I'm trying to design a "double-buffer" structure similar to that used in UARTs (for receiving). In my case, it is for samples from an ADC. I shift them in, and at some point my logic detects a ...
-3
votes
0answers
40 views

Switching Sine wave at specific duty cycle and Frequency [on hold]

How to get the waveform as shown in the image .The sine wave is already generated throgh xtal oscillator circuit.
0
votes
3answers
60 views

Half-wave voltage doubler question

I've been having trouble trying to understand the circuit mentioned in the title, which you can see in the picture below. Note that I'll be using the ideal diode model in my explanations. In case ...
3
votes
1answer
40 views

Additional V+ pin on ALD1106

I'm working with ALD1106 as part of a circuit I'm testing, but looking at the datasheet for the part, I'm confused by the addition of the V+ pin. It doesn't look like it's tied to anything in the pin ...
0
votes
0answers
43 views

How to drive a 220V AC voltage regulator programmatically? [on hold]

All voltage regulator I saw on the net are controlled manually, mainly through a potentiometer. I currently use one of them to control the speed of a fan. Now I want to control the speed automatically ...
0
votes
0answers
42 views

Can I test the nominal value of the MOSFET with one circuit? [on hold]

When this circuit is used, the MOSFET is burned, so it is questioned that the MOSFET supplied by the supplier does not reach the nominal value. For example: use IRLR024 (55V/17A), burn at load (24V/2....
6
votes
1answer
90 views

Voltage Controlled Current Source - help needed

I am designing a voltage controlled current generator for the currents in a range from 0 - 2.5mA. The load resistance is within the range of 0 - 5k Ohms. I decided to go with difference amplifier ...
2
votes
3answers
676 views

How to control the output voltage of a solid state relay

Considering this solid state relay: The output voltage can be from 24 to 380V. How can I control this voltage? Is it proportional to the input voltage? What I need is a voltage regulator that can be ...
0
votes
0answers
36 views

Can I design a board that can charge a phone while it is powering a slave device via OTG? [on hold]

I have a USB-C phone that is connected to a board which is then connected to a slave device. The phone is in host mode while it is connected to the other device and I can issue commands and receive ...
1
vote
1answer
37 views

How to determine the length of the last data field in a SDO block transfer?

I've got a problem with the implementation of the CANopen SDO Block Transfer. The transmission is ok except the last block: ...
2
votes
2answers
104 views

Is shielding the entire circuit with a faraday cage a good idea?

Let's suppose I have a circuit which contains a 3.3V MCU and a buck converter (let's think that its frequency is higher than 400 kHz). I'm wondering if shielding the entire circuit would not a good ...
-4
votes
0answers
44 views

Add usb port in old hi fi music system [on hold]

i want to add usb in my old sony music system to power up the audio bleutooth receiver from inside . This is the link of the repair manual https://elektrotanya.com/sony_hcd-rv555_ver.1.2.pdf/download....
0
votes
1answer
36 views

Protected 3.7v battery as replacement for 3.8

I have a set of bodycams that need replacement batteries, and i cannot find anything suitable short of 400 quid to send them back to manufacturer. At that price i might as well spend the extra 100 and ...
0
votes
3answers
139 views

What causes a thorn like feeling when your put your hand in water in electronic appliances?

I live in India, the voltage supply in houses is 220V. Sometimes, for example in my washing machine, when it is full of water and I put my hand in it, I get a feeling like a thorn/tiny nail is ...
0
votes
0answers
26 views

Mid-Infrared sensor cover (not PIR)?

I came across this great little sensor (AK9750), which can detect people in 4 directions with a good range of about 2 meters. However, its spectrum sensitivity is between 5000 and 7000 nm, which is ...
-3
votes
1answer
59 views

Why must a block in NAND SSDs be erased before it can be reprogammed? [on hold]

Before programming a NAND based SSD in page-level we have to always erase by block-level which increases write amplification. why is it so and how do we mitigate it? what is the necessity of erasing ...
1
vote
0answers
67 views

Struggling to get an amplified sine wave over a small inductor at low frequencies

I am building a power amplifier circuit to amplify a sine wave over an inductor from a function generator. However because the inductor is small and i'm running at a low frequency I am getting ...
0
votes
2answers
61 views

CC/CV Buck controller

in this model can anyone explain me how is it going to work in CV mode and where is the potential divider and all, like where is the Vfb
0
votes
0answers
25 views

Altium Description Item ID change

I am using a library that is located on our company's servers. This library is linked to Altium. After finishing my schematics, I noticed that a description for a type of resistor I was using was ...
0
votes
0answers
30 views

How to determine laser diode beam range [on hold]

I am using this laser diode PLT5 520B. I want to know the range of distance the diode can output the beam. It is not mentioned on the datsheet.
1
vote
0answers
69 views

Does current in neutral wire flow like this? [duplicate]

I've read neutral wire in 1 phase AC at home has almost 0V at both ends. But still current flows through it. So I've assumed 0.1V potential at the other end near a resistance (bulb). Now there's a ...
-1
votes
1answer
53 views

How to find out the history of how many microns for lithography used on silicon wafer?

I think as of 2019 it is said that 7 micron is the smallest possible? I wonder how much it was in 2010, 2000, and 1995. Where can such chart be found for what the number was possible in the past?
0
votes
1answer
55 views

Is isolation required for MOSfet gate driver's and microprocessor's power supply?

I have designed a 62W , 24V-5V buck converter operating at 250KHz. I am using TI's UCC27200A gate driver and Infineon's Optimos 4. The problem is that the driver doesn't have any kind of isolation ...
0
votes
0answers
38 views

Should we use ieee.Numeric_Std_Unsigned?

I know that in VHDl, there is a multitude of library, I have come to the conclusion that the only 2 library that should always be used are: ...
4
votes
2answers
221 views

What does the prefix “+/-” indicate before the data line names?

At this link there are specs of a converter with the following excerpt: What does "+/-" sign indicate(mean) above before TxD or DATA? As far as I know TxD pin/line transmits and RxD receives the ...

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