The output tag has no wiki summary.
2
votes
1answer
41 views
Thermocouple signal conditioning - how to deal with low output swing margin of amplifier?
I have this thermocouple conditioning circuit. Let's say my gain is 100. Minimum low level for AD8237 is 20mV. As K type thermocouple outputs 40uV per 1C, I will have 4mV per 1 degree C.
This ...
1
vote
1answer
87 views
implementation of a large number of outputs (1024+)
I want to control 32x32 (or even 64x64) pieces of electroluminescent or electrochromic film with a microcontroller.
Film itself will be driven by supertex hv816. Planned refresh frequency 2-4Hz.
...
4
votes
3answers
95 views
Using Single Ended Output with Differential Input by Grounding one Input
I am making a frequency generator using the AD9833 (programmed from the PIC16F876). I wish to use a Programmable Gain Amplifier to adjust the signal level before being sent to a power amplifier ...
0
votes
2answers
133 views
5v output to 3.3v?
I have a microcontroller and a Raspberry Pi, both running off of the same 5v supply, in parallel. The microcontroller has 4 5v output pins and the other is a Raspberry Pi, that can only accept inputs ...
1
vote
1answer
81 views
Powering the output side of a voltage regulator?
Would powering the output side of a voltage regulator cause any damage to it? (The ground pin would be attached as well) It will not be normally, but I am making a multi-voltage power converter and ...
0
votes
1answer
56 views
How do we OR two bits in ATxmega128?
I am working with ATxMega128 and programming it in C.
I have two inputs coming from a sensor and I want to turn on an LED when I get output from either of the sensor.
I can blink my LED if i get ...
2
votes
2answers
113 views
How can we alter a single pin of ATxMEGA128?
this might be a basic question but I did try searching for the answer before posting the question.
So, I am trying to set one of the ports to output. I used
...
1
vote
1answer
141 views
Build an Audio Toggle Box
I want to build a small box with two audio inputs and two audio outputs, with two switches to control the current input/output. Something like this: http://www.youtube.com/watch?v=mQzLnt0_-zU
I've ...
4
votes
1answer
161 views
PIC pins change state when DC motor connected
I'm new to PIC programming, and having trouble getting getting it control a DC motor. It's a PIC18F25K22, and a TI L293D driver. Power is suppliued by a 5V linear regulator connected to a desktop ...
10
votes
5answers
554 views
Hardware solution to fade LED on/off with digital output
I'd like to find a hardware-based solution to make LEDs fade from digital pins. i.e. instead of switching on/off, slowly fading (500ms) into/out of full brightness.
I can't imagine a small capacitor ...
-2
votes
1answer
396 views
Can I connect a BNC output of DVR to the antenna input of a LED TV? [closed]
I have a DVR and a LED TV. The DVR provides 2 video outputs, VGA and BNC but the LED TV only accepts 2 possible video input (HDMI and antenna socket).
In my mental model, as the BNC output of DVR and ...
0
votes
2answers
158 views
how do I output through GPIO pins instead of RS232 from a Z8 Encore MCU?
I'm currently learning about MCUs in school (read: n00b) and I'm trying to fool around with the equipment at home. Problem is that I only have a netbook and don't have any serial IOs on it, so I have ...
2
votes
3answers
143 views
Drive Fight on 7400 Series
I'm currently designing a 7400 series circuit to drive LEDs from a set of shift registers (74595). Each shift register's tri-state input is wired to the output of a 2:4 decoder (74139), and the ...
0
votes
2answers
206 views
How much power does 5V and 6A provide in Watts?
Am I right in concluding that a unit that says 5 V and 6 A on the back supplies 30 W of power? Or is it that it requires 30 W to be powered? And if so, how do i calculate how much power the unit ...
-2
votes
1answer
86 views
Controling Digital I/O [closed]
I need to turn on an 12 V or 24 V equipment with an digital Output. What is the best way?
I already tried out with a optocoupler, but nothing happened.
I need the cheapest solution.
2
votes
1answer
379 views
Is pinch off voltage of JFET constant?
The drain current is related to gate to source voltage by the following equation:
\$I_d = I_{dss} (1 - \frac{V_{gs}}{V_p})^2\$
Now, with changing \$V_{gs}\$, I think \$V_p\$ also changes. I am ...
4
votes
3answers
342 views
Using lots of slide potentiometer for computer control
I want to mount a bunch (say 16+) slide potentiometers in a long project box (or other housing that can sit on a desk) that I can use to interact with software on my computer, specifically lighting ...
5
votes
3answers
275 views
Does there exist an IC that allows on-the-fly routing of signals?
Do there exist ICs with N input pins and N output pins which, either via EEPROM setting or via on-the-fly control by a microcontroller, allow one to route each of the N inputs to ANY of the N outputs?
...
2
votes
2answers
90 views
Maximum effective range of RG-6/U in CCTV
How long RG-6u i can use in my cctv? what's is the effective range using RG-6u?
4
votes
1answer
90 views
Input and Output pin voltage specs on a datasheet
I'm a bit confused about input pin voltage tolerances and output pin voltage values of ICs.
I would think that datasheets for ICs that involve signal inputs/outputs would list two values:
The ...
2
votes
4answers
606 views
Pulldown resistor on output pin, how does output still work?
On a part I'm working with, it says that you can configure the part to operate in a particular mode by "strapping" a particular pin to ground. That is, it wants you to use a pulldown resistor to pull ...
3
votes
3answers
441 views
What shift register ICs am I looking for?
I'm designing a project that requires far more I/O than a typical microcontroller offers. No problem, right, just use shift registers and stuff. Wait nope, why am I having problems?
I'm planning on ...
1
vote
2answers
628 views
difference between dry contact mode output and open collector output
We have a device which can work with dry contact input and a device which gives open collector output. Will it inter-operate?
Is there any difference between dry contact mode output and open ...
6
votes
2answers
2k views
How to trigger a transistor from iphone's audio output jack?
I want to trigger a transistor using iPhone's audio output jack. My goal is to turn off an LED(which is fed by an external +5V battery) by sending an audio signal from iphone's output jack. At the ...
5
votes
2answers
564 views
Op amp rectifier : transfer function and output impedance
I'm working on an EE student project which uses a rectifier to keep the peak value of a sine wave.
You can find a PSpice pic of the schematics below (Ve is the input (1kHz), Vs is the output).
Op amp ...
6
votes
1answer
671 views
With a uC, I can input analog voltage levels, how do I output them?
With a uC, I can input analog voltage levels, how do I output them?
I have a simple Arduino Uno R3 I had picked up, which has a few of each pin types (analog input, digital output/pwm, serial) and ...
1
vote
1answer
144 views
Transformer - If the Output V number matches, does it matter that the A numbers are different"
The transformer that came with my Kinkle Fire say "DC Output: 5V1.8A". I want to install some Fastmac Usockets in my house but their specs say "Output: 5VDC 2.4A". Do the different A numbers matter? ...
4
votes
2answers
126 views
Handling audio (from mic to headphones)
Right, I'm new to electronics, but this is what want to know:
What do I need to take a mic input, and output it to some ear phones (standard jack, can be mono). I want to build a motorcycle intercom, ...
0
votes
1answer
361 views
stepper motor digital frequency and speed?
In what way the frequency of digital pulse affect the stepper motor funtion.
I want know this because i can send digital pulse through my data acquisition card at rate of 100Hz. I want to run bipolar ...
4
votes
1answer
441 views
Netduino to power 12V LED Strip
I'm a programmer by nature, but I thought I'd try dabbling in programming a micro controller.
I've hooked up my voltage meter, and have figured out how to switch my output ports on/off, and they're ...
1
vote
1answer
230 views
Logic Buffers for CPLDs Outputs (and Inputs?)
Today, I tried to use a ULN2003a darlington array as a buffer for my CPLD's outputs. While it works well, I have a concern. The max. voltage where the Max V is guaranteed to read a low is 0.8V. The ...
1
vote
4answers
433 views
Pulldown resistor on MCU output?
I'm using an MCU to drive a set of SSRs, and whenever I reboot the MCU, the outputs that I have attached to the SSRs go high temporarily. I know that a pullup/pulldown resistor can keep a CMOS input ...
4
votes
6answers
448 views
Simplest possible I/O for Homebrew 8-bit CPU
I am working on designing an 8 bit cpu as a personal project for no real reason. I am using mostly 74HC series chips and am generally focusing on ease of programming over performance.
I am using ...
1
vote
2answers
129 views
Connect multiple in/outputs in predefined order (beginner question)
I want to create a device for my guitar pedals which can rearrange my pedals in any given order. I have the following: At the beginning of the device I have an input for my guitar. For each pedal I ...
1
vote
2answers
164 views
Video entry sender has only one signal line for Microphone + Speaker
I am planning on connecting an off-the-shelf door camera (audio/video sender) to my project.
I've posted an extract from their manual here
The video output is composite which I can support, but ...
1
vote
3answers
429 views
Displaying text on a LilyPad?
What are the best options to show a line of text on a LilyPad Arduino, probably using a matrix of LEDs? Are there any thin and inexpensive displays?
The main problem is that the only things I can ...
3
votes
2answers
131 views
How do I translate voltages to user-supplied levels?
I'm working on an AVR/JTAG/whatever programmer. The programmer will interface with chips running at various voltage levels, ranging from 1.8V to 5V. The programmer runs at 3.3V.
The programmer ...
5
votes
3answers
3k views
Reading and understanding electrical specs on laptop AC adapters
My Dell laptop comes with an AC adapter with the following specs:
65 W
Input AC: 100 - 240 V, ~1.5 A, 50 - 60 Hz
Output DC: 19.5 V, 3.34 A
My HP laptop:
...
4
votes
3answers
139 views
Recommendation for a USB digital simulator
It's becoming quite frequent to me having a new digital subsystem which I want to test in isolation before trying to make a prototype circuit. I've been using the digital analyzer by Saleae for ...
6
votes
2answers
469 views
meaning of set low/set high
I often see those phrases in tutorials with microcontroller I/O. An example use is "set pin 3 high", or "set pin 5 low for 20 ms".
I also recall reading several different definitions on what that ...
2
votes
4answers
2k views
Hex inverter floating outputs
For a project, I am connecting the output ports of a 74AC04E hex inverter to bnc ports.
Something could be (but not necessarily) be plugged in at one or more ports at a given time.
Should the ports ...
4
votes
2answers
2k views
Configure a PIC pin for Input and Output
I am working on a project which uses a PIC24FJ64GA002 mcu.
I am working on a bit-banged serial communication function that will use one wire to send data and then switch to receive mode to receive ...
8
votes
3answers
394 views
Easiest and cheapest way to get digital outputs from a computer to the real world
I need a number of digital outputs to connect my computer to the real world, however it seems that this job is not nearly as easy as I had hoped.
I've looked into a number of different methods, ...
3
votes
3answers
907 views
arduino thermal anemometer
I've been trying to use my arduino as a thermal anemometer based on the excellent and tiny IST FS5 "thermal mass flow sensor" - there is more information and a datasheet here - ...
5
votes
2answers
694 views
Programmable current source
I need to build a programmable current source from a 8051 microcontroller.
It needs an output current from 0 to 10mA maximun.
How do i go about doing this? what circuits do i need to build?
I was ...
