0
votes
0answers
3 views

What does it mean to “reproduce Morgan's equivalents along with Boolean Algebra”?

This is my first time attemting anything like this (not posting on the forum, the subject itself) and would like some guidance. It's more of the guidance side. Can someone start me off in the right ...
0
votes
0answers
13 views

How does an electric cord work? [on hold]

Can someone explain how does an electrical cord with 2 prongs works? If, for example, both wire connected to the metals (don't know the exact terms for them) on the male-end touch each other while ...
0
votes
0answers
19 views

What components or circuitry exist that can provide extremely high speed, accurate clocks?

I've been curious for awhile now about doing some high speed projects, such as measuring time differences of radio wave reception, and was wondering if there exists components that provide clocks much ...
0
votes
0answers
5 views

Connect/Pair two BCD210 Bluetooth modules

I'm trying to connect my two Parani-BCD210 bluetooth devices. I'm using them through a UART connection from a micro-controller(ATMEL AT89C5131 ). The problem is, I can connect my devices with my ...
-1
votes
2answers
38 views

How to turn a switch on/off repeatedly in 1 minute intervals?

I have a light bulb plugged into an outlet and I need to be able to turn it on and off again and again in 1 minute intervals for a period of 10 hours per day (a total of around 600 on/off events per ...
1
vote
0answers
29 views

Floating plane in PCB

I just designed a simple class D amp pcb in which the ground plane is in a star configuration with the IC as center as suggested by the datasheet (cuts in signal areas vs big cap areas, etc..). VCC ...
0
votes
0answers
17 views

Connecting any signal route with unused pin

I am using BGA package type of MCU, and it has ball pins on the bottom side. As I route the signal route, some of pins should be connected with unused pins without build-up method. The pins are not ...
0
votes
1answer
18 views

Help Identifying Touch Controller Chip

My oven started displaying an error code E11 that indicates a "shorted key". These chips are on the back of the oven touch panel. They don't seem to be the Atmel chips. The marking on the SOT23-6 ...
0
votes
0answers
33 views

What can this component be on troubleshooting a hot wire system?

I'm using a simple system to heat a Nichrome Wire to cut some materials. It was working for years. The illustration is below: Recently when switching with a tiny serial switch(switch is just after ...
0
votes
0answers
9 views

USB OTG - Is a suspend/wakeup state necessary?

I am currently designing a USB OTG device, and am wondering if it is necessary to include suspend/wakeup protocols. I have taken a look at the USB OTG physical layer supplement/checklists ...
0
votes
1answer
50 views

comparator problem

where is the mistake in my circuit? i attempted to create simple continuity tester, image really explains it pretty much. IC - ne5532p PS: i know reference voltages on two op amp (+) terminals are ...
0
votes
0answers
24 views

Extend the Ethernet port of raspberry pi [migrated]

I want to extend the Ethernet port of my pi using a short bit of cable plugges in into the pi and soldered to another rj45-jack. In the jack I have here, are some built-in coils ( looks like ...
0
votes
2answers
34 views

Short distance detecting device

I'm looking for a sensor that would activate at a certain distance from the magnet or whatever would be signaling the location. The distance would range from 2-30cm and there would be obstacles ...
0
votes
0answers
10 views

GSM SIM900A Board and USBtoSerial

just got my SIM900A board same as Connecting GSM SIM900A module with Ardunio and I am trying to connect it to my USB-rs232 converter. I couldn't find any doc on module itself, has anyone done it? Tnx ...
0
votes
2answers
55 views

Diodes in parallel circuit analysis

Could some please help me understand why D2 is on and not D1 on a) and why is D1 is on and not D2 for b). This is for ideal diodes
-1
votes
0answers
34 views

Smallest Size of a piezo buzzer

I need to use a component that will emit a 130db siren ( the distance is not an issue right now) with a frequency of 2khz-4khz. After some research I feel as though in order to achieve this I can ...
0
votes
2answers
38 views

Protocol design in a steel conductor

I was wondering what energy efficient protocol should I use for a FSK modulation in a steel conductor. My limitation is on the number of continuous bits I can transmit due to the charging and ...
0
votes
2answers
44 views

How to turn continuous signal into a short pulse using logic gates?

Basically, I want to turn a continuous "1" into a short "1" pulse then "0". I'm new to logic gates, apologies if it's too obvious.
0
votes
1answer
38 views

Okay for USB to send data without specific OUT command first?

I have been going back and forth between writing software for my device and the PC application trying to get the protocol right. I have a pic18f4550 talking over interrupt transfers. It needs to ...
-1
votes
0answers
42 views

What components are in a personal alarm? [on hold]

for my first year university project I am designing a bracelet which is a rape alarm and a GPS device. I have searched the internet endlessly trying to find out the exact components needed in order ...
0
votes
2answers
51 views

What are the main causes of Overshoot and undershoot of a signal?

I'm not an EE major, but I was curious what causes overshoot and undershoot. Where can i find a detailed explanation of the process? I heard it has to do with the parasitic capacitance, but there ...
4
votes
2answers
258 views

Why use an external resonator with an ATmega microcontroller if it has one built in? [duplicate]

Why should I use an external resonator with an ATmega microcontroller if it has one built in? I'm specifically referring to many of the 8 MHz Arduino boards. A lot, if not most, have an external ...
0
votes
2answers
55 views

can signal ground be carried in the connector shell?

I have a cable with 6 pins but I have 6 signals and I don't have space for the signal ground. If the shell is continuous from end to end, would it be fine to use that as the signal ground?
0
votes
3answers
61 views

Thevenin voltage for a simple circuit

Trying to find the Thevenin equivalent voltage for the circuit on the picture below. This voltage is supposed to be found at the round dots to the very right in the circuit. According to the answer ...
0
votes
2answers
46 views

Best way to convert a voltage output from a circuit into graph software

Looking to convert a voltage output from a circuit in order to show a voltage/time graph. From my knowledge I would have thought the best way to transmit the data would be to use the mic input on the ...
0
votes
3answers
73 views

Whats the reason for triangular carrier PWM

I understand that triangular carrier PWM uses a higher frequency triangular carrier wave to compare with the desired output waveform but I would like to know more about the process. I've also learned ...
0
votes
1answer
24 views

please help me choose power mosfet for multilevel inverter

I am doing my senior project on cascaded multilevel inverter. I am planning to use MOSFETs as switches in my project.Please kindly give me instructions and respective formulas for getting right ...
0
votes
0answers
35 views

Characterization of Power Harvester

I have chosen a power harvester to power a few things as part of a wireless system. This one is the one I have and it seems to be operational: http://www.powercastco.com/PDF/P2110-datasheet.pdf ...
4
votes
4answers
446 views

Building a short term analog memory. Would this work?

As an engineering student, I'm trying to think of an analog equivalent to a flip-flop. My goal is to have a short term memory of a signal, saturating the transistor being the trigger. Kind of like an ...
0
votes
1answer
42 views

Question regarding electrical resonance/impedance

Me and my friends are currently working on a project where we have basically soldered a microphone unto a circuit with a small laser pointer. We have a reciever circuit consisting of a photo resistor ...
0
votes
1answer
28 views

PIC18f45J50 2nd Serial port?

I am working on a GPS tracker Project where i need to interface with a GPS module and a UMTS module for 3g connectivity. with this i need 2 serial ports on a single microcontroller. For this ...
0
votes
1answer
17 views

nRF51 DK with Keil uVision. I2C library compilation error

I am working with the nRF DK trying to read a sensor over I2C. I wrote some code in Keil uVision and I finally could read the sensor. However, for some weird reason I can't figure out, recently the ...
1
vote
2answers
63 views

Should I always put a low-pass filter on an ADC input?

I'm a recent hobbyist EE and new to micro controllers. I've built a test circuit to make measurements with a type K thermocouple, a PT1000 as well as an oxygen sensor. The weak signals go through a ...
-4
votes
2answers
44 views

Logic gate with certain truth table needed

I'm making a thing in Multisim and for it to work I need a logic element which works like in this truth table: A B X 0 0 A 0 1 0 1 0 A 1 1 0 So, if B ...
6
votes
1answer
626 views

Should I avoid BGA?

I am designing a board and have found that a BGA component is cheaper than the larger footprint. I am curious if I should be reluctant to implement a BGA with regard to extra steps during ...
0
votes
1answer
94 views

Is a 1.8v supply too low for driving a long bus?

I'm designing a circuit comprised of two boards separated 23 inches away and connected through a ribbon cable which carries an I2C bus (400Khz) and various interrupt digital signals, plus VCC and GND. ...
0
votes
1answer
65 views

Input Impedance of amplifier circuit

Why we need to consider the emitter resistance re while calculating input impedance of the given amplifier circuit? Is this a compulsion? I found out that even in case of common collector amplifier ...
0
votes
1answer
54 views

blinker circuit theory

simulate this circuit – Schematic created using CircuitLab A simple light bulb blinker circuit.......R4 is the bulb..I'm pretty sure I understand the functionality here. C1 initially ...
0
votes
1answer
59 views

Ratio Between Voltage and Charge

Is there a ratio between the voltage and charge of a battery? I mean, the voltage falls slowly while the charge is consumed? Or occurs a sudden drop of voltage when the charge is at the end?
0
votes
1answer
30 views

Rechargeable battery configuration for 5V

I have 6x 18650 (3.7v) cells. I'm trying to build basic power-bank and wondering what battery configuration would be better for minimizing power loss in voltage regulation/conversion process?
0
votes
0answers
26 views

Can I (re-)use USB data lines after charger detection?

I'm looking to add the Texas Instruments BQ24253 battery charger to my hardware design and to connect it a micro-usb receptacle. Does BC1.2 Compatible D+, D– Detection mean I can no longer use ...
0
votes
1answer
31 views

LT1054 Consume more current

why is the LT1054 Consume more current nearly 160ma ,for actual 40ma load? .so battery voltage drop significantly . can i get an proper solution?. following is the circuit ,i have used with 10uf ...
0
votes
1answer
26 views

Using CP antenna for receiving and LP for transmitting

I've set up two antennas with Linear Polarization (LP) in both sides, in 2.4 GHz no more than 4 meters each other, but they are facing strongly obstruction object (like a big steel wall in they line ...
0
votes
3answers
48 views

BJT VCVS with high gain

In a lecture I learnt a BJT VCVS which has gain = 1, i.e a voltage buffer as shown in the figure. The speaker said that it was the ideal VCVS model of a BJT. My question is that is it possible for ...
0
votes
2answers
35 views

CMOS: dual of cascode circuit

If this is a differential cascode CMOS amplifier simulate this circuit – Schematic created using CircuitLab (where the "first" stage is nMOS and the "second" one is pMOS), can the ...
0
votes
1answer
47 views

High Power LED connected to Dry battery

I am new to electronics as i love working with circuits. I have 12V 6W SMD LED, which I want to attach with Battery Powered Driver which currently gives me from 10v-14v DC with 50mAmp. Shall I connect ...
0
votes
2answers
29 views

No data from XPORT (<- USART) to TELNET

hobbyist and students, [TL:DR] - Can't send (uart) chars from my PIC through my xport to my telnet connection (and can't receive)? [Software] MBLAB X IDE Lantronix DeviceInstaller XC8 compiler ...
0
votes
1answer
38 views

Possible methods to control the voltage of a variable 3 phase power supply for an electromagnet?

The only solution I can think of is a three phase variable transformer, are there other methods? If so, what is the standard or accepted method to control the voltage of a variable 3 phase power ...
3
votes
2answers
34 views

interrupt using Timer0 on PIC18f

Im looking for a little help and advice on my code. Im using C18 in the MPLab environment, PIC18f4520 with Fosc @ 4MHz, and usnig timer0 in 16 bit mode to count to overflow, set the overflow bit and ...
0
votes
0answers
28 views

Baud rate from my serial port. Communication between my teensy 3.1 and bluetooth module

I'm facing a trouble about baudrate and I would like to deeply understand how baud is working. I know that baud is symbols per second, and from google search there is a lot of explanations. What I ...

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