0
votes
3answers
20 views

74HC00N getting really hot with 5V and GND attached

I'm doing a project with an SN74HC00N NAND gate and when I wired it up the chip got really hot really quickly. I immediately unplugged everything and tested just with 5V and GND plugged in and none ...
0
votes
0answers
11 views

Do Bus Functional Models have ports?

I am doing a Master BFM, will my code contain these?? ...
-2
votes
0answers
21 views

how easy & how small [on hold]

Good morning I have an idea stuck in my head & have tried looking up the answers until I came across this site, which is really helpful. Anyway I really need to know how easy is it to make a ...
0
votes
0answers
16 views

Transformerless Realtime Clock Issue

I have an issue with designing a Real Time Clock by using Transformerless power supply. I don't use RTC IC but I use Microchip PIC instead and 32kHz clock. I use battery of 3.3V for backup supply. The ...
1
vote
0answers
18 views

Op-amp with compensation has positive feedback with over-unity gain

I am looking at the following figure (Maxim APPLICATION NOTE 5129 Stabilize Your Transimpedance Amplifier): I just can't understand the following: in the region half-way between fF and fi, the ...
0
votes
1answer
14 views

Capacitive Touch and implementation with BeagleBone Black

How might I make a basic capacitive touch sensor for the Beaglebone Black that is capable of sitting behind an insulating material? I would like to make it as basic as possible, and without any sort ...
0
votes
0answers
5 views

Simple Arduino - 74hc165 shift register construction [tmli5] [migrated]

I'm quite new to Arduino world and I'm trying to understand how shift registers work. I built this construction : .. In fact, it is an Arduino Duemilanove with AtMega on it, but afaik it doesn't ...
0
votes
1answer
13 views

have a motor actuator md120-01-l2-416-091 Input DC18-35V 5A MAX want to increase speed, what do I need to use to accomplish this

Motor actuator DC18-35v +-5A Max, what is best way to increase speed, is used in a chair
0
votes
1answer
27 views

How do I get a firmware .hex running on a PIC18F2550?

I've been playing with this data logger board that's based on the Microchip PIC18F2550, but my application requires a lot of analog front-end signal conditioning. I would like to combine everything ...
0
votes
0answers
17 views

Cortex M3 timer precision

I'm trying to make an application with software timer which is counting real time minutes when a gpio it's in a low condition. The problem is that the timer, according my timer in my smartphone, are ...
0
votes
1answer
30 views

Help identify round diodes - need a replacements

few diodes died in three phase rectifier circuit on a motorbike. I can't find any suitable replacement online since I can't understand what kind of packaging is it. They round like a round pill. 7mm ...
0
votes
1answer
18 views

How to create counter with unique sequence

I have a sequence: 001, 110, 010, 001, 110, etc. Although there are 3 bits that I want to represent, only 2 are needed for states (3 states). What I get confused with, is utilizing only 2 state bits ...
0
votes
1answer
21 views

Is it possible to calculate capacity of a battery using a resistor

Is it possible to measure the capacity of a battery if the discharge curve of the battery utilizes a resistor as the load? For example, if a 100 ohm resistor is connected to a battery and then the ...
0
votes
0answers
18 views

How to convert accelerometer values into fixed reference frame using quaternions?

My aim is to map raw accelerometer, gyroscope, and magnometer data into a "world view" or external reference frame. For example, in my test experiment I move the sensor board vertically up and down ...
0
votes
1answer
13 views

Debouncing/Stabilizing power supply rocker switch?

I'm having trouble with the power signal out of my Rocker Switch (https://www.sparkfun.com/products/8837 for reference). My PIC18F4550 + 16x2 character LCD screen project was running fine until I ...
0
votes
1answer
27 views

How long does it take (in seconds) to burn a fuse with high surge current?

Like the title says, how long does it take in seconds to burn a fuse? Of course it will depend on what type of fuse and the one I'm using is 61NM 250V/8A but looking at datasheets I could find on ...
0
votes
0answers
35 views

Can op-amps be easily damaged?

I'm testing a circuit with a NE5532 op-amp in buffer configuration and I think I've somehow broken something. These op-amps need 5V and -5V as power input. The 5V voltage is easy to obtain, but the ...
0
votes
0answers
17 views

How to determine load to use in a battery discharge curve

I am making a discharge curve of a battery I am testing. So for the discharge curve, what load should I use? (This was kind of answered here, but it was kind of a guess in that the load is based on ...
0
votes
0answers
27 views

How to find the cut off and maximum voltage rating of a battery

How can I find the cut off voltage of my battery (for discharge) and a maximum voltage (for charging)? Is there an equation to do this, or are these two calculate by making a discharge curve? Thank ...
-1
votes
0answers
33 views

What is the difference between Switching Mode Supply and Switching Regulator?

If they are not the same thing which is used where and when?
0
votes
0answers
25 views

Rock Band hi-hat mod alteration

Somebody posted this diagram for a rock band drum DIY mod. In the regular drums, there's a yellow & blue input (cymbals). This mod is to change the yellow input and add a drum pedal to affect ...
0
votes
0answers
29 views

“Drawing” signals with antenna

Can you produce max waves, adding them, creating massive spikes like it showed in this video with water, but with multi antennas. Can you do this with electromagnetic wave in air with some complex ...
0
votes
0answers
34 views

0 to 152 Meg Ohm resistance increase circuit

Trying to make a circuit that, at 2 Ohms per second, increases resistance from 0 to 152 MegOhms I have tried dual transconductance amps balanced with a timer. There was a micro controller presented ...
0
votes
1answer
19 views

Best way to simultaneously control two servos positioned horizontally and vertically?

I'm trying to set up a C program where a servo (servo1) sweeps to a position, waits a few seconds, moves to another position and repeats 4 more times. Another servo, positioned vertically, (servo2) is ...
0
votes
1answer
34 views

Bitwise operation for UART, AVR

I'm trying to work on UART for AVR. After setting the baud rate registers UBRRnX, I'm trying to configure the UCSRnA register. I'm trying to set the 2nd bit, U2XO. Which is the right way to do it? ...
1
vote
2answers
38 views

Wrong voltage in op amp circuit to adc

my circuit is not giving me the expected voltage. This is used to measure the current flowing trought the shunt. For example: if I expect 1.3, I get about 1,15V out. Anyone knows what I did wrong? ...
0
votes
0answers
12 views

PIC10F202 configuration bits MCPU and IOSCFS_4Mhz

So I have the following code which orginally had the __CONFIG line uncommented apparently this is depreciated in recent versions of the XC8 compiler from Microchip. I found the #pragma config ...
3
votes
2answers
65 views

In an op-amp, what does connecting the negative supply to the feedback do?

I'm trying to understand how the LM317 works? I've found that a good simplification is the following: So a practical example would be simulate this circuit – Schematic created using ...
1
vote
1answer
32 views

Difference between antenna resistance and impedance

From what I understand about antennas, they have a certain impedance. At the antenna's resonant frequency, the capacitive and inductive reactances cancel and the reactive part of the antenna ...
-1
votes
1answer
28 views

Component to measure energy transfer

Is there a component to measure energy transferred in a DC circuit? Essentially it would have to be some kind of counter and it would be incremented by the power level on every beat. I am looking for ...
2
votes
1answer
56 views

How to trigger several cameras from a microcontroller

I have 3 Nikon D300 cameras, each with a remote trigger release cable used to externally trigger the camera. Inside these cables are 3 wires, shutter, focus, and ground. The shutter and focus are ...
1
vote
1answer
23 views

Better triac gate configuration

I'm an intern who was tasked with finding a way to switch on a motor and solenoid from either 120 or 240 VAC. The circuit on which my supervisor suggested I base my design can be seen below. My ...
0
votes
0answers
8 views

How can you have immediates in the SUBLEQ one instruction computer?

I'm thinking about making a SUBLEQ based CPU on FPGA. SUBLEQ (subtract and branch if less than or equal to zero) is an instruction which is universal. However, how can you have immediates/constants ...
1
vote
0answers
37 views

How to locate FCC ID of a bluetooth device

I'm trying to find the FCC ID for a super common bluetooth trigger, the one used on all the selfie sticks. I went through each manufacturer name I saw on Alibaba and input their company names into ...
0
votes
0answers
8 views

MQ-135 Gas Sensor Interface

I want to interface MQ-135 air quality gas sensor. Sensor have 5V output interface. However my mcu work at 3.3V. I can basically put a voltage divider. But sensor itself is a voltage divider with a ...
0
votes
2answers
54 views

Variac is blowing fuses

I'm using a variac to control voltage on a heating element and we're having issues with the fuse blowing. The variac is rated for a 10 amp fuse and we're using a 8 amp one. The 8 was suggested to ...
0
votes
0answers
37 views

Arduino not switching relays

I have an arduin Uno R3 , I need to create some kind of home automation system for a project, the problem is that everything I connect to the pins works fine until it gets to the relays, I tried ...
0
votes
1answer
24 views

Why DC potential at output of diiferential amplifier limits output voltage swing (peak to peak)?

Why DC potential at the output of differential amplifier (or any amplifier) limits peak to peak voltage swing?I have read that because of direct coupling, dc level increases and this tend to shift the ...
-3
votes
0answers
11 views

How to write Arduino code of PWM output with various frequencies and duty cycle?

55 sets experiments should be conducted using a single program of Arduino leonardo for the following cases case 1) 5 different frequencies with duty cycle constant case 2) 11 different duty cycle ...
0
votes
0answers
37 views

Replace battery with empty/short circuit?

I have a device (Garmin nuvi 765) that can run on external power but which also won't fully boot unless a (reasonably functional, it seems) internal battery is installed. The battery in it has died ...
0
votes
0answers
6 views

LPC4337 I2S Synchronized Word Select Signals

I am trying to setup the I2S peripheral on an LPC4337 device so that it will send and receive audio data in master mode. The problem I am having is that I would like to ensure that both the transmit ...
0
votes
1answer
15 views

Altium Designer Rules - Nets with different width

i would like to know if is it possible to build up a rule that treat a single net in different way. I try to explain better. I've some circuits in which some nets needs to be dimensioned for high ...
1
vote
1answer
16 views

Averaging switch sensor value

I have a float switch that has three possible positions- open when above the water level, closed when below the water level, and rapidly opening and closing (freq~=0.1s) when its near the water level. ...
0
votes
1answer
33 views

One shot pulse Push Button

How could I make a circuit where whenever a push button is pressed, the output would be a single pulse ? The pulses duration has to always be the same regardless of how long the button is held down. ...
0
votes
1answer
39 views

From what organization or document are connector symbols like this referenced?

So in this picture I am asking about the representation of the Plug and Jack. Where does the idea that the plug is rounded on the back side come from? I am trying to put together a best practices ...
0
votes
1answer
42 views

How to make a voltage vs amp-hour discharge curve

This is in regard with another question of mine, how do you make a discharge curve with the y-axis of voltage and x-axis of amp - hour?
-1
votes
2answers
42 views

I need to sample 8 audio sources at audio quality, what MCU can I use? [on hold]

I need to sample 8 audio sources at the same time, at a decent frequency (say, 40Khz). Being only familiar with Arduino, I searched online for tutorials and articles about using interfacing it with ...
-2
votes
2answers
27 views

Battery and inversor required to run an 110V, 500W fridgel, with a 12 V deep cherge battery

My boat has an 110 volts refrigerator that consumes 500W. What kind and size of current inversor should I buy to use it with a 12 volt deep charge battery (800 AH,) and how much could that charge ...
0
votes
0answers
23 views

stm32F103C8xx big or small endian?

is there a reason for stm32F103C8xx to be big endian and is it possible to change to little endian? I have a 16bit oriented addressing scheme that I need to send over wire and other side expects MSB ...
0
votes
1answer
44 views

How to make a discharge curve

I am trying to make a discharge curve for one of my batteries that I have. All I know about it is that it is a 1.5V battery. Now if I have to make a discharge curve for it, how would I make one and ...

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