# All Questions

74 views

### Combined chip with LDO and Buck, what use?

I am searching for a Li-polymer 1A charger with a 3V regulated output. I have found Linear LTC355x serie but can't, after reading many "LDO vs Switching" debates, understand the use of both on the ...
120 views

### Charging phone battery with a high current source

I am working on a project which the goal is using some android tablets to show pieces of video file to form a multiscreen. One electronic problem that I have faced is: The tablets should be always ...
26 views

### How to determine the maximum voltage and current ratings of a peltier element?

I recently bought a peltier with no ratings. None at all. On hindsight, it was probably not the smartest thing to do, but is there any way I can determine the maximum voltge and current values at ...
27 views

### Designing a Handheld Optical Communication Device [on hold]

I'm in a group trying to design an underwater optical communication system for a capstone project. For this system we are planning on using multiple high powered LEDs passing through a lens system, ...
41 views

### DC load line, Gain, and Bode plot of simple FET Amplifier

I am studying for my final exam in my first analog electronics class. There is a question on the review sheet that I don't quite understand. I know the DC load line has x intercept $V_{DD}$, and ...
110 views

### How can I become more accomplished at reading electronics schematics?

I know what the individual electrical components do (RLC). However, how can I learn to read schematics to determine what the circuit is doing? I have seen some experienced engineers looking at ...
38 views

### Connecting strain gauge output terminals to an instrumentaiton amplifier

Before posing the question the figures are about as follows: In Figure 1 a strain gauge's outputs v1 and v2 is connected to an instrumentation amplifier’s inputs. For simplicity buffering part is ...
78 views

### Is it possible to buy high pass filters that work in the 100 kHz range?

I want a device that rejects 100 kHz but lets through 150 kHz. I tried building a simple passive first order circuit but the roll-off wasn't sharp enough. Most standard electronics vendors don't seem ...
60 views

### Cheap 4 digit 7 segment display driver

Can anyone recommend a cheap ( less than \$4 ) driver chip capable of driving a 4 digit, 7 segment display with the center colon? I'm very familiar with the likes of the MAX7219 and similar but they ...
71 views

### Very sensitive PIC16F886 SPI with NRF24l01+

Firstly, it's been 2 years since I've touched anything but mbed or ardunio so there's a strong chance I've done something silly to cause the problems I'm seeing. I have a PIC16F886 on a breadboard ...
49 views

### How to modify a router's antenna? [on hold]

I have tried to extend the antenna of my router in order to increase its range. I added a wire few cm long. There was no modification however in the range. The power (-db/m) was the same. Why is that? ...
16 views

### Receiver for streaming music from smartphone: Bluetooth vs. DLNA [on hold]

I am looking for a mid-level acoustic system for my living room (about 40 sq. m.). I would like to be able to stream music from my laptop and smartphone. I have very limited knowledge about modern ...
64 views

### Problem with T8 LED Bulbs [on hold]

I just moved into an apartment with a very small laundry/bathroom. The prior owner had a halogen track light with 5 - 50 watt MR 16 bulbs. I removed fixture and purchased a 4ft standard fluorescent ...
24 views

### What is the benefit of having HDMI inputs/outputs on an acoustic receiver? [on hold]

I am looking for a mid-level acoustic system for my living room (about 50 sq. m.), to play classical music and watch TV (from a cable receiver) and films (from my laptop; the films are all pre-5.1, so ...
11 views

### How to use rank 1 covariance matrix for designing a kalman filter

I was trying to estimate the covariance matrix of the measurement noise of a (simulated) MIMO system. Turns out. In matlab cov(data) gives me a rank 1 matrix. I checked it. And I noticed that all ...
90 views

### Bringing compiled device to market (and how to power)

(Preemptive apology if this is the wrong place to ask; pointers to the right place appreciated) I've thrown together a device using a Raspberry-pi, touchscreen (plugs into pi) and small monitor ...
50 views

### How can I isolate a servo in this circuit [on hold]

I have a PIC which I am using to control a servo, I have a 5v supply for the PIC. I wish to isolate the servo from the PIC as the noise the servo creates can cause the PIC to malfunction. NOTE: I only ...
56 views

### Transfering my arduino/TI-MSP430 Launchpad/Energia skills to real world projects and C

I'm learning electronics/microcontroller programming through TI-MSP430 Launchpad(Energia) and Arduino. Both are based on wiring framework, and very good place to start for a beginner like me. Now as ...
18 views

### Wireless sensor plus LDR. Xbee or another reccomendation

For an art project I am trying to design a system for controlling several badges. The basic design I am thinking of is like this: a XBee connected to a miniarduino that is conected to both a LDR ...
26 views

### Problem with PSPICE simulation

PSPICE shows the following errors when an attempt is madeto simulate a circuit PSPICE version is 16.6. Running on a Windows 8 OS PSPICE A/D lite opens with the error ERROR:Unknown data file format ...
62 views

### Symbol similar to thermistor

Ive come across this its a 4PDT switch, Im not sure of the symbol or the purpose of pins 13 and 14 Any ideas ?
31 views

### How to / Can you take a 12V DC car charging cable and change it to a USB plug [on hold]

I have been using my dash mounted Radar detector (Cobra XRS 9470) for about six months now. It uses a 12V DC power cord that plugs into the cigarette lighter. Normally this wouldn't be an issue, ...
47 views

### How to understand the functions of a Therm-O-Disc 12S20 H24V?

I am an electrical novice and have a Therm-O-Disc 12S20 H24V (original image) relay that I'm attempting to understand. The only meaningful documentation I've been able to find is this, 12S, 14S, ...
43 views

### Really strange behavior of ADC on ATmega [on hold]

I got this weird behavior on ADC. I'm using ATmega8 with Potentiometer and it worked just great in simulator, but when I made it on a breadboard, it won't get the right value. It behaves like triple ...
86 views

### Arduino LED actuator

I bought the Arduino starter kit and in the project book they say that the pin 13 led is an actuator. I thought actuators were a type of motor. It says: "Pin 13 LED. The only actuator build-in to ...
45 views

### Choosing Altera Quartus II clock rate for stopper

I'm using Altera Quartus II to built a stopper. I'm using 2 counters and I need to choose the right clock rate to get pulse every 1 sec. There are only two options in Quartus for the clock: 27Mhz and ...
34 views

### Choosing first circuit of EQ to make [on hold]

I'm only a little bit experienced in electronics, have taken part in school project with Arduino, have soldered at home simple Tube screamer effect and made a lot of useful adapters etc. Now I want ...
50 views

### DC-DC 12V converter using switching voltage regulators: heatsink dimensioning and board design

To replace my overheating linear regulator DC-DC converter, I've designed this new board. This time I used a couple of switching 12V regulators (LM2575-12V). I'm using two 1 amp regulators because my ...
27 views

### Calculating the voltage generated by an 40KHZ Ultrasonic Tranceiver

In particular, this device: http://www.hexamite.com/hx40str.htm ...
32 views

### Difference between MIL and IPC footprints

I've always noticed the different MIL and IPC footprint libraries in CAD tools. Usually, the pads are slightly different sizes. What is the reason for the difference? Tolerance? Quality assurance?
23 views

### MCP73871 <=> MCU interface

I am designing a small device powered by a lithium cell and I'd like to use the Microchip's MCP73871 battery charger to enable charging it from an USB port. The charger IC has three status indicator ...
22 views

Not sure if this is the correct stack exchange platform for my question but I'm pretty sure you guys can help me out with my idea. I was thinking about building a wall mounted touchscreen powered by ...
95 views

### Simplest way to measure 98 to 140 Ohm range with an ADC?

I have a thermistor that should vary between 98 and 140 Ohm and am looking for the simplest circuit that will convert this into something meaningful for a 10 bit ADC in the 0-3.3V range. Precision ...
114 views

### Can someone explain this simple schematic? (capacitor with voltage regulator)

Please understand that i am actually a really beginner in electronics. I found a really nice topic on how to create a 5V DC from a 9v power supply. All is ok. But in order to smooth out ripple, the ...
60 views

### Questions regarding determining specifications for a powerful electromagnet [on hold]

I am doing a project where I need to use an electromagnet that I am trying to custom build. I am basically not from electrical engineering/electronics background but sw developer BG. I have few ...
44 views

### Flash Memory on an ASIC

Are flash memory and ROM also considered integrated circuits? And so, is it possible to embed a flash memory or a ROM into an ASIC?
55 views

### Is an instrumentation amplifier design same with a standard op amp?

Is instrumentation amplifier nothing but a standard op-amp with a different configuration? I wonder if the inner complicated circuit of an instrumentation amplifier same with standard op-amp's. At one ...
47 views

### Design a circuit using only 2 to 1 multiplexers that implements the function of an 8 to 1 multiplexer

I'm not entirely familiar with multiplexers and I don't fully understand the concept of how I can make a 2 to 1 imitate a 8 to 1. Is there a predetermined/default truth table for multiplexers that I ...
36 views

### Return Paths of Parallel FETs

I'm attempting to design an H-Bridge which can supply 24V at 60A. As 60A is a lot of current I decided to parallel upto 4 FETs per leg to split the current. I am using a MIC4102 2A driver to drive ...
69 views

### What is this go-no go function in some oscilloscopes and how can I use it?

I have seen some oscilloscopes with this option (go-no go function), but I don't know what it is. I couldn't find anything about it in my searches. What is it?
70 views

### AN7323 what does it do? [on hold]

Does anybody know what this chip does? I can't find a datasheet I think it is a ADC and could use it a lot, if it is. But need a sheet :P
55 views

### Acknowledge polling in EEPROM

I am using C18 compiler and I learned that acknowledge polling feature will greatly help in reducing the write time that is to remove the fixed delay in traditional methods. Well I am using EEPROM ...
87 views

### Looking for suggestion on microcontroller [on hold]

I took a course on using microcontroller of Intel 8051 long times ago. Recently, I am going to develop a module to control precise-timed TTL output and my instructor suggests to use microcontroller ...
78 views

### Soldering a VGA cable - number of wires doesn't match [on hold]

I decided to open up a VGA cable which started to produce only red / blue / green colored image. I thought that inside I will find something like shown on this scheme: Instead I found that my VGA ...
51 views

### Can I use a UPS to compensate for unsteady line-power? [on hold]

One of the outlets in my home provides unsteady power that causes connected electronics to occasionally shut down. If I buy a battery backup device such as this will it be able to compensate for ...
55 views

### Maximum distance for AVR UART on 3.3V

I need to connect two boards using UART of AVR. I wanted to know how much can be the maximum length of the cable between two baords if VCC is 3.3V. I dont want to use rs232 here. This question didnt ...
51 views

### Typical licensing fee for embedded software? [on hold]

Wondering if there's a general range of fees that a software vendor would charge chip makers for embedding into their hardware?
30 views

### Arduino connect with servomotor and load cell [on hold]

Sorry everyone, may I ask about the connection problem with Arduino. I found it is difficult to find the electrical diagram for Arduino which connect with the load cell (weight sensor) and the ...