0
votes
0answers
4 views

Identifying bluetooth device from bluetooth signal name

I did a scan for bluetooth signal using my samsung smart phone. I detected a signal whose device name showed as 26:62:12:11:43:30. Is there any way to find out what kind of bluetooth device this is? ...
0
votes
0answers
5 views

Development board for NFC with SD slot

I need to a development board to develop NFC based SD card. The board should have NFC controller , antenna, and a SD slot. If there is any can someone suggest one and may be the cost. Thanks for the ...
0
votes
0answers
26 views

Project to Print School ID on a 7 Segment Display - All Segment Outputs are High When Simulated

I am working on a project that uses a BCD up-counter block, a BCD to school ID block, and a BCD to 7-segment display, in order to print out my school ID on the 7-segment display of an FPGA. Here is ...
1
vote
0answers
5 views

Nodal analysis independent and dependent voltage source and current source

After spending quite a few hours I am stumped with this problem while trying to solve for Vo, which is supposed to 0.5V and this was confirmed through PSpice. I have no idea what I am doing wrong or ...
-2
votes
1answer
38 views

What is I2S and DSP?

I am learning to build an amp.(TA2020, circuit from datasheet). I would like to know about the I2S and DSP, and when and how to integrate these tech. Specifically speaking, if i am suppose to ...
0
votes
0answers
14 views

Can BJTs operate in the nano-ampere range?

Can BJTs can operate predictably with very low currents, in the order of nano-amps or less? I am involved in microelectronics design and have made a voltage reference chip that is MOSFET-only and ...
2
votes
4answers
57 views

Resonance frequency

How does one find the resonance frequency in a circuit? Wikipedia and the like give some definitions that are not very useful in practice. I found somewhere(I think on this site but I cannot find it ...
0
votes
1answer
32 views

PIC12 DAC has no output

I have a PIC12F1571 (datasheet here: http://ww1.microchip.com/downloads/en/DeviceDoc/40001723b.pdf) that I have programmed to read an analog input, do some processing on the value read and then ouput ...
2
votes
3answers
95 views

What corresponds to a resistor in the hydraulic analogy to current?

In the hydraulic analogy to electrical current, pressure is voltage, water moving is the current, but what is a resistor? I've heard that a resistor corresponds to a constriction in the pipe, but a ...
1
vote
2answers
36 views

IC for data redirection

I was just wondering if an integrated circuit exists that would do the following: Has around 10 inputs (8 for 8 bits of data, 1 for output selection and one for output enable) and 16 outputs Will ...
0
votes
1answer
18 views

Need a help with 3D Low Frequency Wakeup Receiver AS3933

I am software developer and I am totally new to circuits field. Can somebody help me to understand how the 125 kHz transmitter and AS3933 receiver works? This is the link where it says how it ...
2
votes
3answers
66 views

Required output impedance for ADC input?

On the Atmel AVR 328P on the Arduino Uno, the ADC's an R(ain) value is 100Mohm - which I assume is the ADC input impedance? However, in the datasheet it says "The ADC is optimized for analog signals ...
1
vote
2answers
39 views

Analog Fan control via PWM

I want to control a fan using analog voltage instead of PWM. I have a PWM signal from MCU. I want to use a low pass filter to convert this to analog, so 0 to 3.3V based on PWM duty cycle. This will ...
0
votes
0answers
22 views

Looking for Low Voltage UltrasoundTransducer 25-30kHz

I am on the hunt for a low voltage ultrasound transducer that operates in the 25-30kHz range. I am hoping to run it off of a 3.3V coin battery. Thus far I have not been able to find anything close. ...
2
votes
3answers
50 views

Oscilloscope gear and ESD

The answer might be obvious, but I am curious, how well are oscilloscopes and probes usually protected against ESD? I noticed that oscilloscope probes are usually shipped in esd-protected bags. On ...
0
votes
1answer
21 views

ERROR:Xst:827 - while synthesizing the code

I 'm trying to synthesize the below code using Xlinx ISE 14.3 but I get below error.I could simulate it successfully.Please help as I'm a newbie in VHDL. ERROR:Xst:827 - ...
-2
votes
0answers
29 views

Adding different input modules to amplifier [on hold]

I learning to build a TA2020 based amplifier (built from datasheet). The input pin, according to datasheet, accepts analog sources. I would like to know if by simply adding bluetooth and usb modules ...
0
votes
2answers
26 views

How to feed RFIN pin of HCS500?

I am trying to make a prototype receiver based on HCS500 Keeloq decoder IC. However, I'm not sure what to feed with RFIN pin? Should I just put antenna or data from standard ASK/OOK decoder, which ...
-3
votes
0answers
25 views

RH4-5419 219C2013 36 RF printer chip? [on hold]

My friend found a chip on an old printer with the following information : RH4-5419 219C2013 36 We think its an RF chip and we might be able to use for broadcast applications. Does anyone know ...
2
votes
4answers
79 views

TL431 Constant current source

I have few doubts regarding TL431. Please correct if i am wrong.. TL431 can be used to generate voltages from Vref to 36V. Output voltage is taken across diode in reverse biassed condition. ...
1
vote
2answers
73 views

What does “5k1” in the given schematic mean? [duplicate]

What does the "5k1" stands for it is a normal 5k Ohm resistor? (Marked with "A" in the picture) The chip is an MAX13020 LIN-transceiver.
0
votes
0answers
22 views

Can bad Bypass diodes in solar panels cause drop in amperage? [duplicate]

I had 6 panels at home they worked well for a few days but today the amperage dropped suddenly the voltage is proper but can't get the right amperage from cells can a bad bypass diode cause this ...
2
votes
1answer
20 views

Should the ground plane of a noisy mezzanine card be connected to the ground plane of the main card by metal mounting hardware?

I have a mezzanine card, 60 by 40 mm, mounted near one end of a main PCB, about 160 by 40 mm. This card is a known source of EMI problems and, in fact, has a metal shield over it. But, I suspect ...
0
votes
0answers
30 views

Can bad Bypass diodes in solar panels cause drop in amperage? [on hold]

I had 6 panels at home they worked well for a few days but today the amperage dropped suddenly the voltage is proper but can't get the right amperage from cells can a bad bypass diode cause this ...
1
vote
2answers
73 views

What parts can I use to make 110V DC from 4 D-size alkaline or NiMH batteries?

I need help with choosing DC/DC converter parts. I want to build D-size battery powered lantern working with typical E14 or E27 compact fluorescent lamps. Here is my awesome idea :) It will be ...
0
votes
1answer
20 views

Input and output clamping current of the IC 4082 [duplicate]

I was reading the datasheet of the IC 4082 but I was not able to understand what are input clamping current and output clamping current of the integrated circuit. Can someone explain these terms?
1
vote
2answers
67 views

Voltage and Current along a Wire

In this question I am referring to this article. At first I was looking for a physical explanation of the fact that energy or the signal, respectively, travels much faster through a wire than the ...
2
votes
2answers
42 views

low power displays

What kind of displays can I use effectively with a coin cell battery (CR2450)? From previous answers I know that a liquid crystal display without backlight can be used but I wanted to know if there is ...
1
vote
0answers
20 views

SIM900 use same tcp connection to receive and send data

I'm trying to make my gboard (Arduino with attached SIM900) talk with my server over GPRS and a TCP connection. Firing up the board, attaching GPRS to it and make a tcp connection all works fine. ...
-2
votes
1answer
65 views

Simon says without Micro-controller (just using digital logic components)

I'm doing a Simon game as my DLD (Digital Logic Design) project, so I'm asking if it is possible to do it only using DLD components (AND,NOR,NAND,OR,FLIP-FLOPS,....) without doing any programming, ...
2
votes
1answer
45 views

parallel port routing

I'm currenty working on a 4 layer PCB that requires two parallel memories.My question regards the distribution of the traces in the PCB. Is it better to trace them like a bus: or is it better to ...
0
votes
2answers
44 views

Can a 9v battery be substituted with an array of LiIon 3.7v?

I use some audio devices (mixers and effect boxes) that literally drains out my 9v cells (specially the rechargeable). I'm thinking on doing arrays of LiIon batteries (rated at 3.7v-4000mAh each), ...
3
votes
2answers
80 views

USB3 with fewer wires

USB3 offer a much faster bandwidth than USB2 but, technically, at the price of more wires that results in a thicker cable. USB3 is build with 9 wires, 4 are standard USB2 and 5 are the USB3 serial (2 ...
1
vote
0answers
76 views

Any Home Made Alternatives to using X-rays to identify ICs?

I am on the hunt for several ICs by searching for the markings on them. But sometimes the markings are just too vague and I cannot really guarantee that the IC I found is the IC I am looking for. I ...
5
votes
6answers
540 views

Sending I2C reliabily over Cat5 cables

I am considering implmenting an home automation system around my Raspberry Pi but I found the price and space requirement of inserting a Pi every place some control is required too much but the Cat5e ...
-1
votes
0answers
65 views

Help building an amplifier [on hold]

I'd like to design a Class D Amplifier for household listening. The specifications from the point of view of a consumer are: it should be portable it should provide at least 8h of playback time ...
1
vote
4answers
943 views

Is my phone battery better / more capacitative than my laptop battery?

When we go out and look for phones, the first thing I do I always look at the battery capacity, usually 2000 mAh, 3000, up to 10000 mAh for a (external?) battery. Looking at laptop batteries, they ...
-2
votes
0answers
28 views

Hfe tester of a npn transistors [on hold]

Design a microprocessor transistor hFE tester using 8086 microprocessors. The system has to display the hFE value of NPN transistors. The transistor under test (TUT) is to be inserted in the socket, ...
0
votes
1answer
52 views

Passive Voltage Divider attenuator design technique

I want to build a passive attenuator which will attenuate an input signal. I want the to have 12 steps, starting with no attenuation and with each subsequent step having a 0.5dB attenuation (so down ...
1
vote
1answer
82 views

Is this DSP sinewave inverter a marketing hype?

There are some companies in my country(India) which try to sell inverters for home marketing in the name of DSP Sinewave Inverter and claim are superior to normal sinewave inverters. I am trying to ...
0
votes
2answers
67 views

Does 1Vac matters to a Arduino pin?

I am planning to do a current measurement with Arduino. The board I'm using is mega 2650, operating voltage is 5V (I/O pin limit is 3.3V). And the CT I'm using is exactly the same as this tutorial, ...
-3
votes
1answer
64 views

Help debugging this pwm controller [on hold]

So I'm sitting here playing with this PWM controller. I've been playing with it for about 5 hours now. And so help me god, not even once have I gotten the output to work, in any way. I'm powering it ...
0
votes
0answers
24 views

Register file to handle binary numbers to then be sorted (circuit diagram)? [duplicate]

--The inputs to the muxes are just the output Q of the D flip flop. They go in descending order instead of across the register. There are two sets of four 4-to-1 muxes, each posses the same inputs ...
0
votes
3answers
46 views

bjt biasing and applying input signal

At the first fig. there is a basic common emitter amplifier circuit where signal source v_i is "superimposed" on the dc bias voltage V_BE. At the second fig. a biasing scheme (poor, nevertheless ...
0
votes
0answers
16 views

Discrepancy in output of post PAR simulation and bit file output

I am using Xilinx ISE to generate a bit file. I verified the functionality by post synthesis as well as post Place and route simulation . But when same bit file was loaded in FPGA there was a zero ...
1
vote
0answers
71 views

Super slow serial (UART) communication on Arduino [migrated]

I am using this device for my Arduino that connects to the OBD-II port of my car to get various information such as speed, rpm, etc. I am using this for a digital Nixie tube speedometer using the ...
2
votes
2answers
74 views

Can smd ferrite beads be avoided [on hold]

I am redesigning an input interface circuit for digital input. Its a basic signal conditioning circuit for reverse polarity protection, EMI ESD protection, and filtering voltage surges. For EMI EMC, ...
3
votes
1answer
51 views

Load cell, help

I am using load cell, from here. Load cell specification are mentioned on the site. 5 wire coming out, its a 4 wire core shielded load cell. What screwing thing i am facing is: Getting same voltage ...
0
votes
3answers
110 views

How to calculate power supply for 100x loads @ 3V 700mA

I'm currently designing a setup using 100x loads that requires a 3V 700mA supply ea. The loads are connected in parallel with the main power supply. I'm a bit doubting about my power supply dimension ...
0
votes
1answer
34 views

BCD Up-Counter Schematic Error

When I try to simulate my schematic for my up counter, i get the error Net "Net-name" cannot be connected both to an input port and an instance output pin. Here is my schematic I am pretty sure ...

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