# All Questions

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### How could extension cord detection be implemented in Tesla Roadster?

Googling finds evidence that Tesla Roadster electric car can detect cases when it is plugged in via extension cord. Specifically this page lists error codes 937 and 9 meaning "extension cord ...
17 views

### Dimming USB Led Lamp

So, currently I have a project that consist in the following: We have 2 USB Led lamps. (e.g 13 leds, 5V, ~200mA) To these lamps, we would like to control the intensity of the light, through a ...
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### Wierd current at 8051 port 1 pin

The pins in Port 1 has internal pull-ups when used for input. The Mosfet is off and the drain is pulled high using an internal pull-up resister. I connect and ammeter and see that the current (IL ...
27 views

### Crystal oscillator “voltage control” pin usage

What does "voltage control" mean for a crystal oscillator? For example where a crystal oscillator marked "40 Mhz" has a control pin. Can I use PWM to control it?
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### Verilog Netlist and verilog file not justifying each other

i generated a verilog netlist file with the help of a test case for 2-1 encoder .To test the netlist i draw the schematic diagram and try to find the output.I can't upload the pic of schematic which i ...
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### How much max distance of SPI & USB & I2C and TWI(without any IC [closed]

How much max distance of SPI & USB & I2C and TWI(without any IC(my mean is directly)), and how can i amplify these?
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### Why sometimes i should use RS232 (or another chip for another protocols)? [closed]

Why sometimes i should use RS232(or another chip for another protocols)?
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### Can i directly connect this chip to PC and how can i amplify it (NRF24L01)?

Can i directly connect this chip to PC and how can i amplify it for increased range (NRF24L01)? for more: http://www.semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=765
23 views

### Capacitor discharge [closed]

I have a 1 microFarad capacitor and the range of the capacitor is 400 V. If I apply 315 V to the capacitor how many Volts will the capacitor discharge ? How to calculate the discharge of the ...
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I am designing an Xbee mesh network, planned size is around 10 nodes spread around 200 square metre area. It will be a combination of nodes reporting environmental data with actuators/loggers. I ...
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### Measuring power consumption / current of an Arduino using a multitester

What is the correct way to measure the power consumption and / or current draw of an Arduino using a multitester?
17 views

### How to match this given circuit to a model for a simulation?

I have to simulate the electric field within a gas filled discharge gap generated by a radio frequency voltage generatio. The circuit, provided to me by the experimentators somewhat far away, is given ...
26 views

### Stable voltage and current source

I want to build a simple and stable constant voltage source (voltage regulator) and current source. I built one using a LM317 but the output is not stable, it varies when temperature changes. Do you ...
22 views

### Can someone give me a DDR3 RAM for Dummy(ies) FPGA designers type of resource? [closed]

I want to understand how DDR3 RAM is used with a FPGA. Basically I want to know what ALL the signals on the interface do and what is required to read/write the data.
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### ATtiny85, ARduino IDE, TinyDebug: Error sending int values

The setup: An ATtiny85 is programmed using the Arduino IDE, it is supposed to read the ambient light from an LDR and turn on/off an LED accordingly. To get a better understanding of what my sensor ...
10 views

### Alternative IBIS model

What do you do when you want to simulate a signal (i.e with Hyperlynx) but you can't find the IBIS model of the receiver chip? What parameters do you need? Where can you find them?
43 views

### Need your knowledge on cameras

I have to design a system which works with a camera device. To explain briefly, I need to get image information and I need to send some information to my vision system, such as shutter speed, trigger ...
64 views

### I don't understand what are the difference between UNO and Leonardo?

I found that they sell UNO Starter kits and Leonardo Starter kits. There are many different products. My eyes are so busy. I am a greenhand. If I want to buy a stater kit, which one should I buy? UNO ...
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### value of variable in Veriog not defined

I am analyzing a verilog file for always. in this, what should be the value of "en" in case first and then in second? ...
33 views

### Arduino Uno as a programmer for AVR chips

I am trying to make an Arduino Uno act as an external programmer for an ATmega32 and ATmega 8. I couldn't succeed, I used connections as given at Using an Arduino as an AVR ISP and Arduino Uno as an ...
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### Where can i find the datasheet for this component (RF2001)?

Where can I find the datasheet for this component (RF2001)?
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### Compatibility of Atmel AVR32 AT32UC3C & AT32UC3A

I am looking at the AT32UC3C MCU for an application which requires CAN. I would like to plan on prototyping my application using the AT32UC3A via the EVK1100 evaluation kit. Would my solution be ...
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### Using a 7 segment display to show numbers 1, 2, 3 and 4 with four inputs

I have in my car 4 LEDs which illuminate in the instrument cluster depending on the gear the vehicle is in. This is a factory standard setup which I have already run feeds from ready for the next ...
28 views

### Eagle part for “MiniLED” SMT LED

I'd like to use this LED, but its package is just listed as 'MiniLED' in the datasheet. Is that a standard package, or just a Vishay term? Is there an equivalent part already in Eagle 6? If not, ...
56 views

### How to fix a broken amp [closed]

I really messed up on this and Any help is great. I was powering a line six low down studio 110 audio amp with a power inverter connecting to a battery. The inverter was square and I realized that ...
144 views

### Likely places to look to find cheap sources of FPGA? Which devices should I open first?

I have a large group of new and old devices and I would like to find a FPGA to start poking around on. What products or types will be likely to have FPGAs in them? I recently asked this question on ...
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### Pull Up and Pull Down Resistor Values [duplicate]

I usually use 10K Ohm resistors for pulling up or pulling down micro-controller lines. This is only because I have tons of them. Recently while looking up pick and place surface mount information I ...
38 views

### calculating the spectrum of digital modulation methods

I have just started studying the techniques of digital modulation. The book i am reading only has mentioned the psd of bpsk, bfsk , qpsk and msk. I would like to know, how the psd is actually ...
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### AH276 hall effect sensor with microcontroller (sensor already in circuit - brushless fan)

I'm currently trying to read an AH276 hall effect sensor using an AVR microcontroller. The sensor is built-in in a brushless fan I'm using and it's operating as the fan's controller. The sensor has ...
40 views

### Using a N-Mosfet to switch a common cathode ledstrip

I am trying to drive a RGB-ledstrip using the following circuit: http://learn.adafruit.com/rgb-led-strips/usage As I am using a Common Cathode led-strip instead of a Common Anode one as used in the ...
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### Voltage/resistors/series/impedance/meter

Assume you measure a power supply voltage through a series 1M OHM resistor and observe that is drops by 1/2 its former value when no resistor is in series. What is the input impedance of the meter? ...
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### N-Ch FET with open-drain output

I stumbled across this line in this datasheet (page 10): Serial Data Output Pin. Internal N-Ch FET with open-drain output that requires external pull-up resistor. It shifts out the previous ...
36 views

### Solid state relay not working as expected

I am using a PID temp. controller with 11 vdc output to a Fotek SSR-25 DA to control a fan. When DC power to relay is on the LED lights but I get no continuity across the AC N/C contacts.If I put 120 ...
75 views

### Calculating the resistor needed to replace batteries with another power supply

The project I'm working on is going to use a LiPo Battery to run a Raspberry Pi, Arduino, and some LED's. I currently have all of that working. One final thing I want to do is have a "Speaker" plugged ...
50 views

### Altium help with Routing

I am working with a new computer at my company learning Altium. I have created the schematic and the PCB files inside my project and successfully imported everything from the schematic to the PCB. My ...
92 views

### Controlling Microcontroller using Visual C# [closed]

I want to control some motors from the Microcontroller but I want to control the Microcontroller from the computer using C# or at the very least get some feedback to the computer How can I do that ...
93 views

### How are BGA dies constructed?

Are the dies made for a BGA package any different from the dies for a QFN or a DIP Package? Do BGA dies have connections on the lower side of the die? In the substrate? How are terminals put in the ...
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### LC Dual Mode Resonator Modelling [closed]

I am trying to model an ADS circuit of my Dual Mode Resonator with two LC resonators and Inductively coupled Input output ports in MATLAB. I want to model this circuit and this response in MATLAB: ...
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### Help required performing Single Master - Multiple(upto 16) Slave SPI Communication using MSP430

I am planning to use MSP430F6638 for SPI Communication between a single MSP430 Master and multiple MSP430 Slaves. I am using a 4x16 Multiplexer before each Slave for providing the Chip Select Signal. ...
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### Precision Tracking filter required

I don't mind if it's a band-pass or low pass filter (although I think low-pass will give a better result). Input operating frequency range is 100Hz to 1kHz. Input amplitude will be about 1Vp-p and ...
79 views

### Solution to this signal even or odd [closed]

Can you please explain this function whether it is odd or even step by step: $x(t) = cos(t) + sin(t) cos^2(t)$
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### PIR sensor triggered by itself when using timer, works without timer

TL;DR A PIR sensor is triggered by itself when using a timer to wait 2 seconds after the sensor is triggered. Without using the timer to wait the sensor works as expected. Background and setup I ...
48 views

### FPGA Board : Indirect SPI not working

I was able to make my own custom FPGA shield for an ARM Cortex M3 board (arduino footprint ofcourse!). I used the PapilioOne as reference for basic board design. There is no FT2232 on the board. I ...
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### Why is the CPU hot when it's turned on? [closed]

Why is the CPU hot when it's turned on?
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### What, if anything, makes shielded loop antennas so great at rejecting local noise?

There is a folk wisdom, among amateur radio operators, that if you have a lot of noise on HF, such as in an urban location, then using a shielded magnetic loop antenna for receiving is really great ...
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### Use an active PS/2 -> USB adapter as USB-Serial Bridge

I'm working on a small robotics project where I need to enable my old phone (Nokia 5230, shows up as USB Serial port on Windows but USB cable is straight-through) to talk to an Arduino UNO R3 (doesn't ...
56 views

### What advantages to permeability tuning as against capacitive tuning?

I learnt recently about the RBZ80 ; a vintage valve receiver which used variable permeability tuning rather than variable capacitor tuning. In thinking about the possible reasons for permeability ...
77 views

### Circuit design example

What will a combinational logic circuit look like using any basic gates having the output=1 when the input=110 and 101?