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votes
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59 views

Something is wrong with my Wien Bridge

I want to create a wien bridge oscillator to use in my later projects so I tried to simulate a schematic I found online. Its stated that R1 = R2 and C1 = C2 should be true in order to circuit to ...
0
votes
0answers
7 views

PSpice Model Editor Not Giving .dll and .lib Files for VerilogA Module

I am trying to learn how to import VerilogA Modules into PSpice using the Model Editor. For now I am starting with a simple VerilogA model of a capacitor so I can learn how to use the Model Editor and ...
0
votes
3answers
55 views

Generating Asymmetric AC PWM with MOSFETs

I have a tricky project that requires -10 V low, +40 V high, duty<0.5%, 2 kHz PWM. Load: 50Ohm resistive (forward),backward is probably in MOhm range. max power 1W (only works with very low duty). ...
0
votes
2answers
41 views

Does the lm317TG require a load resistor in the final design or just for testing?

I'm building variable voltage regulator, the regulator has levels of 9, 12, 15 and 18 volts and a potentiometer that allows for incremental adjustment between the levels, so at level 18v you can drop ...
-1
votes
0answers
75 views

What's the minus 12V on a breakout board for? [duplicate]

I'm a newbie learning electronics with an Arduino. I'm looking at this breakout module to use with an old PSU instead of buying a lab power supply. There are terminals available: +5V - I can use to ...
1
vote
0answers
18 views

STM32F469 with AS4C4M32S SDRAM only able to write first byte

I have made a custom board that features a STM32F469NI MCU coupled with AS4C4M32S SDRAM. Following are the SDRAM timing and register set information: ...
0
votes
2answers
59 views

Can I plug in too many LEDs (i.e. 26) on Arduino UNO?

So, I know Ohm's Law and that Arduino UNO R3 pins (digital 2 to 13) have a rated maximum of 40 mA, although it's better to consider that they have a maximum of 20 mA for safety reasons. If I put 2 ...
1
vote
3answers
296 views

Is this power supply suitable for powering these chip on board (COB) LEDs?

I have an LED project using 100 Citizen CLU048-1212C4 LEDs. I need to run each LED at 70W, and I want to run every 5 LEDs on 1 power supply. I was thinking of using the MEAN WELL LSR-350-35 (it takes ...
-1
votes
1answer
41 views

Need Small Vibrating Motor the Size of a Quarter [closed]

Looking for the most powerful vibrating motor that can be found at the size of a quarter. If anyone knows where this can be found please let me know.
0
votes
1answer
17 views

Stepping over a library (in-built) function in CodeWarrior

I am using CodeWarrior Development Studio to program and debug the NXP FXTH870911. To understand the functionalities, I downloaded an example project from their website. It is called ...
0
votes
0answers
63 views

Does this voltage logic make sense? [closed]

In India, stabilizers have to be used for ACs. At least that's what people say because voltage fluctuation is common here. I'm buying this Air Conditioner and was thinking about to buy this Voltage ...
6
votes
4answers
932 views

Why split the resistance on either side of an LED?

In the circuit below, is there any reason why we can't combine R1 and R2 into one 4 kΩ resistor in either location? simulate this circuit – Schematic created using CircuitLab I am reverse ...
0
votes
0answers
10 views

How does Quartus pin planner know about voltage in each I/O bank?

It is possible to specify a range of I/O standard options in Quartus pin planner. I am trying to understand a few things: How does Quartus know what voltage is supplied to each bank? Why does Quartus ...
0
votes
1answer
30 views

Questions about COBs and power supplies from a beginner

I'm planning to use Citizen 1212 COBs, but I don't know how they can be used on 70 watt for each one of them, knowing that each unit will have 5 COBs. So my question is: what is the right power supply ...
0
votes
2answers
56 views

Can switching between two unsynchronized sources cause problems for an average office building?

We have a 100kW 3Φ 208V generator and ATS operating in North America. The system as installed does not allow for a test where the load can be placed on generated power when utility is available. We ...
-2
votes
0answers
37 views

House wiring - light switch

I have a normal light switch that works which I got the electrician to move to another place. As can be seen the black common wires are connected to the L terminal which doesn't look right (a close up ...
1
vote
0answers
96 views

PCB manufacturer from the 1960's

I have an old ferrite memory core plane that has either an "M" or a "W" watermarked on the board and was curious which manufacturer made this board. "Memory 2006000" is ...
0
votes
0answers
27 views

Trouble with ESC & Brushless motor

I'm new in this group, I hope to be welcome and help you whenever i can. At first i need your help... i'm assembly a drone ( quadcopter ) , and testing the ESC with the motors, and i have issues. I ...
3
votes
2answers
124 views

LED not outputting square wave signal

I'm working on a sensor similar to an oximeter that measures light attenuation through a medium. I have an LED on one side, and an IC photodiode with on-chip transimpedance amplifier (OPT101) on the ...
0
votes
1answer
43 views

What is the simplest logic circuit + latch that satisfies this truth table?

This is not a homework problem, I'm just revisiting/relearning the practical applications of latches and logic circuits and I've been trying to figure this out on my own. Basically, I want to turn one ...
0
votes
0answers
36 views

display 0-200 on LED or LCD Panel Display using 0-10V signal

I wish to display a number from 33 to 220 on a Panel Display LED or LCD. I have a controller that can output any range from 0-10VDC and I can build a table to output temperature vs Vout in any range ...
0
votes
0answers
52 views

Testing DC Motor with a Torque Wrench

How can I measure the torque of a stalled DC motor @ 6V using a torque wrench? I'm trying to test my DC motor with the torque wrench method (regular torque wrench used for cars). Any guidance helps. ...
2
votes
1answer
63 views

4-bit counters not working properly

I have three SN74HC161N connected such that an overflow on the first triggers the second etc. (the normal ripple carry setup, where RCO feeds into ENT). The clock inputs of these are connected to a 1 ...
0
votes
0answers
32 views

RF Switch Component Identification

I'm trying to identify the IC chip below, which I believe to be an RF Switch. Any help anyone can offer regarding who the manufacturer might be and/or what the part number might be would be greatly ...
0
votes
1answer
49 views

Arduino transistor switch

I'm building an Arduino switch for two different signals and I'd be very grateful if you can revise the schematic and tell me if there's something wrong or if something can be improved. In the ...
0
votes
3answers
74 views

Relay being switched on even though voltage not applied?

Introduction Firstly, I was not sure if the Home Improvement SE was appropriate for this or here, so if in wrong place I can post there instead. So, what I am trying to do should be very simple to ...
0
votes
3answers
63 views

Usage of 555/556 Timer as a One shot timer

Im using two 555 timers / one 556 timer IC for a project. I've used it a couple of times before but never in monostable mode. Basically I need to activate a DC Motor in one direction for a set amount ...
1
vote
0answers
7 views

Lattice iCECube2 cannot find clock in .sdc file

I've tried a zillion different ways to get the lattice iCECube2 tools to find a generated clock. How do I specify the .sdc file to see the output of baudgeninst, ...
0
votes
1answer
54 views

PCB routing of parrallel capacitors with different values (Based on STM Nucleo64 dev board)

I have been recently trying to understand how the STM32 ICs should be routed on PCB, in particular parallel capacitors of different values for power design. I have come across various suggestion about ...
0
votes
1answer
42 views

Capacitors current options

About capacitors the formula Ic = C*dV/dt refers to the displacement current or to the current which charges/discharges the capacitor?
0
votes
0answers
45 views

Trying to identify a electronic parts company logo SC

Have this DC power connector, and looking for the manufacturer using this logo. SC text in a parallelogram
0
votes
1answer
54 views

Active LPF with cut-off frequency ~4250 Hz lets a 20 KHz signal through

I needed an active low pass filter for my project that can produce an output voltage within the required settling time and ripple voltage ranges. Although I managed to get a good enough output voltage ...
1
vote
0answers
18 views

STMWIN connection to Azure IOT cloud

I am trying to connect STMWIn starter kit to Microsoft azure. I have successfully transferred the binary file which is taken from official ST site and transferred it to the board. I was also able to ...
0
votes
0answers
15 views

Is it possible to drive a 6 or 5 lead stepper motor with 3 phase inverter/bldc driver

I wanted a good way to test my inverter circuit and all I have is a 6 lead stepper motor and a 5 lead stepper motor. Would this work for testing? I have no idea how I would wire the motor. I own a ...
-2
votes
0answers
27 views

Blocking oscillator/slayer exciter with autotransformer?

So I was making a slayer exciter and I was fiddling with primary to secondary coupling when I got this idea: Tesla coil secondary is a quarter wave resonator, and a device called "Oudin coil"...
0
votes
1answer
27 views

EC probe for hydroponics; physical design considerations

I want to build a simple EC-meter with two electrodes for a hydroponics project. A naive solution would just have the (copper plate) electrodes hanging into the water, but then the active electrode ...
1
vote
2answers
53 views

In absence of leakage, what creates the angle between stator and rotor flux in an induction machine?

As per my understanding to produce torque from a machine, we need an angle between stator and rotor flux. In an induction machine rotor flux is created in response to stator flux, why is there an ...
0
votes
1answer
37 views

Deactivating RF modulator circuit in an Amiga 1200, minimum required parts to remove, worrying about composite video voltage

I'm currently doing some work on the PCB of my old Amiga 1200. In order to play some games I want to revive it by installing a scandoubler/flickerixer that I bought to basically be able to connect it ...
0
votes
0answers
27 views

STN1110 UART-RX-LED is flashing rapidly

I did a pcb mount for a stn1110 "Multiprotocol OBD to UART Interpreter" and followed exactly schematic from datasheet. The issue I have is that after is starting, there is a sequence of ...
-1
votes
1answer
113 views

Measuring distance with ~300 m range and at least ~2 m accuracy as cheaply as possible [closed]

[Very new to Electrical Engineering.] So what I am trying to come up with is the following: I want to have a device (receiver) that receives signals and put it in one place, not moving. Other devices (...
0
votes
1answer
108 views

Strange circuit design for driving a fan with PWM

I've recently attempted a repair on a cooling fan circuit in a hard drive enclosure that has me somewhat baffled. The fan is an AD08012HX207000 with a connection for two wires. The circuit that drives ...
-3
votes
0answers
52 views

Attiny84 vs Attiny84A

Does anyone know what the subtle difference is between Attiny84 and Attiny84A? The '84 costs more than the 84A, while the 84A has a wider operating voltage range and uses slightly less current @ 1.8v,...
-2
votes
0answers
35 views

Modulo-7 Counter using D flip-flops (modN(D)P-N1-N2) - How to make it count from 6-12? Is it even working for now (0-6)?

I am questioned with creating modulo-7 counter using D flip-flops as a assigned home work by my classes conductor, and I think I've managed to do this. But I'm not sure if it works properly, so If I'...
0
votes
2answers
36 views

How should endpoint report error for TLP over PCI Express (PCIe)?

On a Windows system there is a PCI Express (PCIe) endpoint device with an application design that handles TLPs from Windows. The design is being updated, and I want to leave out some previous ...
2
votes
2answers
192 views

lm7905 LTSpice is not working

I have downloaded the lm7905 from this source: https://github.com/kafana/ltspice-misc/blob/master/models/regulators.lib unfortunately, it seems that the output voltage is 0mV all the time (the green ...
-1
votes
2answers
66 views

Input impedance of the op-amp inverting amplifier

I have a lab exercise with inverting opamp (gain = 10, R1 = 1k, R2 = 10k). The subject of the lab is to measure input impedance of such amplifier by adding 1k resistor in series to the input and drive ...
-4
votes
0answers
38 views

Loop Analysis By Kirchhoffs Voltage Law [closed]

Loop Analysis By Kirchhoffs Voltage Law, Please hepp me to solve these problems
-2
votes
1answer
82 views

Finding the equivalent resistance

It's just the 3 ohms that got me really confused, because it's connected with the two loops. It's my first time facing such a problem. I first thought that 4 and 6 , 3 are in series so I added them, ...
0
votes
1answer
34 views

DRV8825 Stepper Driver Burning Up

I am trying to wire up 3 NEMA 23 Steppers driven by 3 DRV8825 drivers and an Arduino Due. I tried to solder a perfboard prototype, but when I turned it on the first board burned and the ground jumper (...
0
votes
3answers
93 views

Where do you put the inverter? Near the battery or near the load?

Where do you put the inverter to minimize power loss on a stand alone solar setup? I'm using DC 12V as power on devices but I notice resistance on wires when running long lengths. AC is better on long ...

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