All Questions

0
votes
0answers
38 views

STM32CubeProg vs STLINK Utility

There are 2 software tools provided by ST to flash their STM32 MCUs namely STM32CubeProg and STLINK Utility STM32CubeProg Page says: STM32CubeProgrammer (STM32CubeProg) is an all-in-one multi-OS ...
0
votes
0answers
29 views

Simple Animatronic - slow repeating/reciprocal motion for a window display

I am trying to rig a contraption to pull a model hot air balloon back and forth along a curved horizontal track. Its motion is both horizontal (6’) and vertical. I have built the track and rigged the ...
0
votes
0answers
39 views

1 bit adder-subtractor circuit truth table

today in class my teacher mentioned the truth table for an adder-subtractor circuit was the same as that of a full adder... I have been trying to understand and wrap my head around this fact but I ...
0
votes
1answer
37 views

ST-LINK and PA13,14 Pins on STM32F407

If I use PA13,14 pins for flashing my MCU via ST-LINK programmer then can I also use these pins as GPIO in the same circuit? Will that not disturb the ST-Link if some analog or digital circuit is ...
2
votes
1answer
44 views

Why is shielding effectiveness different for various hole geometries?

I have run into the equation below in various literature/app notes. (example). I have never seen the derivation for such an equation and don't understand why round apertures are more effective at ...
2
votes
1answer
64 views

How do these diodes prevent opamp from saturation?

I cannot understand how the clamping diodes prevent opamp from saturation when the switch/FET is off in the following sample-and-hold circuit: I only know that if the negative feed back of an opamp ...
0
votes
0answers
31 views

ESP8266-01S OFF State (CH_PD at LOW) Draining too much current

I have this project in which the life of the battery is imperative, after various designs i came up with this one: As you can see the pushbutton labeled START puts the CH_PD pin on HIGH for a brief ...
-1
votes
0answers
32 views

STM32F407 Selectable External or Internal Oscillator

I wonder if its possible to switch between external and internal oscillators at runtime? Can I do that configuration in CubeMX? The idea in to put a jumper on a GPIO pin to do the selection at runtime....
0
votes
0answers
9 views

HM-10 Bluetooth: How to read characteristic data via serial commands

I'm programming an Arduino to use an HM-10 BLE device in Central mode to read a BLE Peripheral. I'm able to discover and establish a connection with the Peripheral (via AT+CONnnnnnnnnnnnn command) ...
1
vote
1answer
39 views

LED-strip PWM works with Raspberry Pi, doesn't work with Attiny45

I'm trying to control an RGBW analog LED-strip by PWM modulation. When using an Attiny45 the LED-strip just blinks at a low frequency (approx. 2-3 hz). However, using a Raspberry Pi 3 to control PWM ...
0
votes
0answers
26 views

Simple Circuit: light source seperated from signal source?

Forgive me for the simple question! How would I create a circuit for a light that is switched on when another light is switched on? Basically I want to use a more powerful source for a new light ...
0
votes
1answer
33 views

Minimal circuit to flash STM32F4 using STLINK

I wonder if I need to put some circuit between STLINK and STM32F4 MCU to flash it or does it simply require to connect the wires 1:1 directly? I cannot find it in the datasheet.
0
votes
0answers
33 views

What is the 'right' way for a 3-Phase Watt Meter to determine import-export Watt-hours?

What is the correct way for a 3 Phase Watt-Hour meter to measure total import/export watt-hours? I ask because I have seen this done in 2 different ways both in 'approved' meters: Assume that: Red ...
0
votes
1answer
50 views

Can STM32F4 USART be used as UART?

There are 4/2 USART/UART ports in STM32F407 (Page 15) MCUs as shown in the image. I need 4 UART ports in an application. I wonder if its possible to use 2+2 (UASRT+UART) ports for my purpose in this ...
5
votes
3answers
1k views

Why isn't there any EEPROM in STM32F4 MCUs?

Why isn't there any EEPROM in the STM32F4 series MCUs? Mostly I have Microchip MCUs and they have EEPROM available in them, but I just found out that it is not available in the STM32F4 MCUs... And it ...
0
votes
2answers
58 views

Why doesn't the emitter resistance of a BJT depend on the AC current?

When designing BJT transistor amplifiers, one calculates the emitter resistance of BJT: \$r_e=\frac{26mV}{I_c}\$ where the voltage is the thermal voltage at room temperature and \$I_c\$ is the bias ...
2
votes
1answer
79 views

Logic circuit designs in industry

i wanted to ask what logic designs are used in industry for different logic functionalities? So for example XOR gate: The 1st image would probably save more space on a circuit, but for the second ...
0
votes
1answer
47 views

Constant Current Regulator position in a series circuit

I'm designing a circuit with 3 LEDs, a CCR (NSI50350), and a power supply in series. My question is: Does it matter where I place the CCR? Can I design my circuit this way: +V--LED1--LED2--CCR--LED3-...
0
votes
0answers
18 views

Problem with simulation of a n- mosfet in pspice

Im trying to make a simulation based an a DC sweep from this circuit But at the moment of simulation I receive this warning WARNING: [NET0093] No PSpiceTemplate for M4, ignoring And it does ...
1
vote
2answers
63 views

DC-DC converter inductor current DC component

How does the dc-dc converter (e.g. basic buck topology) ensure that for different load currents (considering CCM mode only), the DC component of the current through the inductor is auto-increased/...
0
votes
1answer
23 views

Timimg of 4060 counter-oscillator

I'm using a CD4060B counter/oscillator and need to know the internal timing of the RESET operation. TI's 4060B datasheet says minimum input reset pulse width is 30nsec at 10V, and the reset ...
0
votes
2answers
36 views

Hall sensor graph

Anyone can help me to interpret the Supply Voltage vs Temperature from this datasheet ? What does it mean ? Why the supply voltage modifies ?
0
votes
1answer
31 views

How to add a Linear and Logarithmic Potentiometer in Circuit Wizard

I'm new in this kind of thing and I'm using Circuit Wizard (Circuit Simulation Software). I was trying to simulate an overdrive pedal circuit (https://www.instructables.com/id/Overdrive-Pedal/) in ...
0
votes
0answers
39 views

Accessory With 3-Pin LED strip?

I have a ton (160ft) of addressable RGB LED strip that I'm using for a fairly large project. After unboxing them I realized they all use 3-pin connectors (data, ground, power) rather than the 4-pin ...
0
votes
3answers
103 views

Is high current in a speaker the same as high voltage?

I'd like to build my own Amplifier, and because I know that the current creates the magnetic field, I don't understand, how amplifying the voltage makes it louder. I mean with high voltage doesn't ...
1
vote
2answers
49 views

Frequency tracking PLL type

I'm unable to understand which PLL type (1 or 2) is better suited for frequency tracking and why? Can anyone explain how that additional integrator in type 2 will affect tracking? Thanks in advance!
-5
votes
1answer
44 views

AC/DC power supply module with 20mA output current

i want get 20mA current with 24V ac to dc. I have found this power supply module with 6-9A output current but i need max 20mA. What can i add with this module to achieve my settings? I am powering ...
0
votes
0answers
54 views

Any Self-turning switch?

I am looking for a switch, which can turn between 3-4 stages and also do it by itself. Do you guys know what I should search for? Thanks :)
0
votes
2answers
44 views

AC motor design

Is it possible to have an AC motor with only a partial stator, one that does not fully encompass the rotor? Refer to the picture to understand what I mean. This would be needed to drive a spherical ...
-2
votes
0answers
23 views

OrCAD Capture quit unexpectedly

I'm doing a project using OrCAD. I reopened the .opj file that I saved last time and didn't see the schematic I was working on last time. So I clicked on the page1 icon under schematic1 and capture ...
0
votes
1answer
21 views

Measure pulse width generated in one pulse mode using HAL

I need to generate pulse in one pulse mode and measure width of this pulse using HAL. I'm using STM32F446RE board. I managed to configure timer to generate pulse but I have no idea how to implement ...
2
votes
0answers
50 views

Why are project files in Altium modified every time they are opened? Is there a way to prevent this?

I use Altium Designer 18. When I open a project file (.PrjPCB), the asterisk ("*") appears next to the project name indicating that the project has been modified, but I haven't actually made any ...
-1
votes
1answer
43 views

Real-time Image Processing [on hold]

I'm looking for hardware to manufacture a machine that will perform real-time image processing in the crop field, which hardware/machines I should use? Thanking in anticipation.
1
vote
3answers
47 views

Behaviour of Voltage on Base in a fixed BIAS Common Emitter Amplifier

I'm having some trouble understanding the behaviour of the basic common emitter fixed bias amplifier. I've been looking at this for awhile now and I'm starting to think there is a foundational ...
0
votes
2answers
50 views

What type of pressure or weight sensors are thin? (Arduino or R-Pi) [on hold]

I want to know if a person is in a walking path of approx. 10x1,5 meters. I thought on putting thin tables in the path and putting these sensors under each even table (to save some money): https://...
1
vote
2answers
36 views

assited gps vs differential gnss

i am writing as essay evaulating accuracy of smart phone gnsss for GIS data collection for part of the essay i thougt it appropriate to mention DGNSS and Assisted GNSS. So far i understand Assited ...
1
vote
0answers
20 views

What causes the fail-safe bit to be set in the SBUS protocol?

What causes the fail-safe bit to be set in the SBUS protocol? I know that the when the link between the transmitter and receiver is lost, the fail-safe bit is set, however, what constitutes a 'lost ...
0
votes
2answers
65 views

How can I dampen current spikes when using NPNs to drive an LED

Hi I have the following circuit, its purpose is to flash an LED once per second. I'm using a pair of transistors as a constant current source but I observe current spikes of 20% or so when it is ...
2
votes
2answers
42 views

Is it possible to make hierarchy of constants in System Verilog?

Is it possible to make a synthesizable hierarchy of constants in System Verilog? For example: There is a board with FPGA and several peripheral ICs. Each IC have some setting registers. Each ...
0
votes
1answer
35 views

Verilog counter made of 32 bit adder (syntax error)

For a school assignment I have to make a counter, based on a 32-bit adder, that increments with 1 every clockcycle if 'enable = high' and 'reset = low'. When I try to use the adder in my counter ...
0
votes
2answers
49 views

How to choose the correct pc fan? [on hold]

I need to replace a pc-fan 2 pin(80X80X25mm). The only details it has are:12V/0.14A.(no RPM/CFM details). Will those details(voltage/current)enough and i can pick any 80X80X25mm 2-pin pc fan which has ...
2
votes
1answer
46 views

How do I calculate constant values across several modules at compile time in Verilog?

I have a Verilog module that uses three instances of the same low-level module, called 'pole'. The instances are identical, except for a constant offset value, which is provided by the top level. ...
22
votes
3answers
5k views

Why does RAM (any type) access time decrease so slowly?

This article shows that DDR4 SDRAM has approximately 8x more bandwidth DDR1 SDRAM. But the time from setting the column address to when the data is available has only decreased by 10% (13.5ns). A ...
1
vote
2answers
86 views

Noob question: blinking leds with pn2222A and 9v battery

I'm kind of new here. I've been roaming around the forum for a while trying to figure out how to finish up this circuit I'm building and really need some help. I'm trying to build a blinking LED ...
0
votes
0answers
56 views

Is it possible to upload an arduino sketch through the serial port (RX) instead of USB [migrated]

In another words, is it possible to develop a custom bootloader so sketches can be uploaded via serial connection made using the RX/TX pins and not via the USB connector (I am using Pro Micro boards)? ...
1
vote
2answers
57 views

How the frequency of oscillation is determined in a multi-resonance oscillator circuit?

If we have a self-oscillator with multiple resonant frequencies, what are the criteria for the preferred frequency of oscillation? For example, a push-pull oscillator with parallel-compensated two ...
-1
votes
1answer
67 views

How to calculate current on diode [on hold]

How to calculate current on diode? I use silicon diode Um = 5V R1 = 43 Ohm R2 = 70 Ohm
10
votes
2answers
2k views

Why does the current not skip resistors R3 and R5 when R6 and R4 have no resistance?

I do not understand why the current still flows through resistors R3 and R5 when R6 and R4's resistance is 0. To me, it would seem that the current would skip R3 and R5, however the answer key says ...
0
votes
2answers
47 views

4 axis quadrature encoders? [on hold]

I am currently working on a digital input card which will feature quadrature encoder inputs. To my (basic) knowledge, quad encoders use two pulse trains that are 90 degrees out of phase with each ...
2
votes
1answer
45 views

WS2812B LED Strip Not Drawing Full Amperage

I recently purchased one of these LED strips. Now I have read all about how these are notoriously known for drawing a lot of current from its power supply so I bought one of these power converters ...

15 30 50 per page