An integrated circuit (IC) is an electronic circuit built onto a single plate of a semiconductor material, normally silicon. Modern ICs may contain billions of transistors and they have played a major part in the miniaturization and performance improvements of modern electronic systems.
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4answers
91 views
What is important in computer clocks' signal: signal edges or intervals when signal is stable? Will multiple value propagation occur?
I am trying to figure out some basics of digital electronics. We have all seen the squared graph of the computer clock signal:
I have read multiple articles on the Internet and still can't figure ...
-2
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0answers
75 views
ic is giving wrong output [closed]
i am making simple one ic Not gate logic using 74104
pin 14 is vcc
pin 7 GND
pin one is connected the LED to the bread board with resistor but when connect that LED to any pin even on the input pins ...
0
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1answer
71 views
Multiplex two I2C ICs into four 7 Segment displays
I currently have two PCF8574AN I2C ICs. Is there a way I could have two seven segments be driven off one IC (So i could run four seven segments displays off the two ICs that I have). I have thought ...
1
vote
1answer
74 views
How could I efficiently implement this “TTL load”?
I'm attempting to test a parameter of an IC to the specifications listed in the data sheet. The data sheet describes the following load circuitry for the output:
The data sheet notes that CL be ...
0
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3answers
109 views
Inexpensive programmable RGB LED driver/IC/solution?
My desire is to have a simple setup with a dial device (ideal would be a 3 click dial with 3 distinct settings but an analog dial would also be appropriate) whereby position 1 would display a color ...
2
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2answers
61 views
CD74HC125E, resistor or not resistor?
I have here an interesting piece of hardware, a CD74HC125E that someone gave me. This chip (can I call this an IC ?) is able to set its outputs to high voltage, low voltage or high impedance.
Do I ...
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0answers
45 views
What are the minimal hardware parts needed for an active GPS tracker?
I am considering to implement an active GPS tracking device that is completely independent, the tracking device should get it's location every few seconds and send that data to a server over some ...
16
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6answers
1k views
How are integrated circuits fabricated?
How are integrated circuits (e.g. a microprocessor) fabricated from start to finish? For example, there must be some wiring with resistors, capacitors to store energy (bits) in a field, transistors, ...
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1answer
51 views
connecting IC with external components
i want to understand the thought process and ideas behind these:
see the schematic
http://www.pololu.com/catalog/product/2124
1 - what is the n-FET and diode (Q1 and Q2) component means?
2 - why ...
4
votes
3answers
70 views
Creating a Sequenced Array of 3 Mosfets with Adjustable Timings
I am comfortable with rudimentary 555 circuits and other basics, but I have something a little bit beyond me now.
I need to have three separate mosfets A, B, and C all turn on and off in sequence. I ...
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4answers
128 views
If-else decision structure using op amps or any other non-programmable electronic device
The title is pretty clear, I would like to know if there is any circuit or an IC capable of dealing with signals to perform algorithmic sort of decisions, I mean, as you can solve differential ...
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1answer
83 views
Why cost of integrated circuits (IC) are higher when purchase online than to local market [closed]
Why cost of integrated circuits are higher when purchase online than to local market.
For example SN7404N on Digi-Key costs around $2 but same i got from local market in $0.2
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1answer
61 views
Help finding Buck/Boost Regulator IC
I have been trying to find a suitable Buck/Boost IC with certain features, but having gone through multiple Manufacturer's product tables, I can't find one that meets my needs. I think this is more ...
0
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0answers
24 views
Smart card dump reader
I have a smart card that I need to dump but I don't know if it's possible. I guess it has a SLE4404 chip. Could somebody give me some information? Links or something because I've been searching the ...
1
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1answer
115 views
Will an IC that requires an Oscillator work without one?
I have a PL2303HX and I just etched my board with a USB to Serial IC (PL2303HX). The problem is that it requires a 12 MHZ crystal but I don't currently have.
Just a side note, the IC is on the same ...
1
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1answer
127 views
What IC should I use to make a binary clock?
I am wanting to make a binary clock. A lot of the schematics I've found are for Arduinos or Raspberry Pi. As much as I appreciate the use of minicontrollers, I don't want to do that for this ...
4
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2answers
229 views
Simple vending machine circuit
As a homework assignment, I was given to design a simple vending machine circuit as follows
Receives 5 cent, and 10 cent one at at time.
20 cent per snack, gives change when necessary (IE, 25 cents, ...
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1answer
59 views
Can you use a 5 input NAND gate as a 4 input one?
I have a circuit that has 4 inputs and am only allowed to use 5-, 3- and 2-input NAND gates. Yes this is an assignment question but I have already solved the design of the circuit.
I just don't ...
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1answer
32 views
TLC59116 (Y59116) maximum output current
I bought this IC (http://www.ti.com/lit/ds/symlink/tlc59116.pdf) to power a few RGB leds. I was under the impression that it could drive up to 100ma per channel, constant current. However in practice ...
0
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3answers
176 views
Improving absolute precision of ADC to balance battery voltage
I plan to use a relatively high-end microcontroller (Piccolo TMS320F28035, 12-bit resolution, +/- 4LSB offset, +/- 60 LSB gain) to measure voltage across stacked battery cells and control associated ...
2
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1answer
106 views
Control multiple LEDs using an IC and PC/Linux thru USB
I've already tried to search this topic but all Google results said that this isn't possible. Is there any chance of controlling multiple LEDs using a PC/Linux, through USB? The diagram might look ...
2
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2answers
74 views
Measuring the current of a DC circuit
I'm creating a set of modules that can be daisy chained and hooked up to a master controller unit. I'd like to have a display on the master that shows the combined current draw of the modules in ...
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3answers
245 views
How do I control a two 12VDC 10A motors using an Arduino?
I am new to arduino and electronics in general but I need some help on a project I am working on. Essentially I want to be able to control the state (on/off) and direction of two linear actuators that ...
3
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2answers
141 views
Breakout Board for 1.27 mm to 2.54 mm
Is there any breakout board like this for 1.27 mm to 2.54 mm pitch?
Example for 1.27 mm:
Example for 2.54 mm:
I also appreciate any hint how to perform this conversion on any other cheap way.
...
4
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4answers
270 views
Is current the same coming out of an IC as it was going in?
This is my first diagram so keep that in mind. I've come up with this circuit because
I've got some 74** series ICs and I want to be able to make them work. This example is
a simple AND gate with ...
2
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2answers
170 views
What can I do as a student to be a better candidate for a hardware design job? [closed]
If you were looking to hire a student still in school for an internship position at a high-tech company (say, Microsoft, Apple, or Google) for hardware design. What kind of skills would you be looking ...
3
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1answer
113 views
List of LM Integrated Circuits?
Does anyone have / know of a list of all the LM integrated circuit packages available? The EE stockroom at my university recently reorganized and they cataloged several pages of part numbers without ...
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2answers
81 views
is my AND logic gate broken? HD74LS08P
when i turn on the circuit, the AND (74LS08) gate keeps sending signal to the 4 outputs, even without signal from the inputs. I may have broken it because i applied 7,5 volts before correcting the ...
3
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2answers
144 views
Identify an IC Found in a Garage Door Opener
Inside a defunct garage door opener I found this IC:
I tried searching for 33192C with variations of 'datasheet' and such keywords, but I got routed to the usual datasheet farms who are happy to ...
9
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1answer
134 views
Max operating temp of IC's
Why do so many IC's have a max temp range of 125C? Is it due to packaging material tolerances, ie the black plastic enclosures and/or the bonding epoxy that holds the die to the package and/or ...
0
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1answer
118 views
What is this IC marked IA89G or 1A89G?
Please I need a bit of your help. Do you know what IC is this marked IA89G or 1A89G perhaps? I've tried Googling but to no avail. I'm really wondering why this is such a hard nut to crack.
Here are a ...
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1answer
116 views
I2C controlled simple audio mixer [closed]
I search for IC that works as audio mixer. I need just i2c interface to control inputs and volume. Also I need mono output. Any advice, please?
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1answer
102 views
USB HID keypress emulator [closed]
The idea is to simulate simultaneous multiple key presses (e.g. Ctrl + Shift + P) out from a USB HID interface on closing a switch. I understand that this can be done with small amount of code on ...
10
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2answers
300 views
Why is silicon used to make microchips?
On my quest to better understand how computers work at a deep level I have come to the question of why, exactly, silicon is used in microchips. I always assumed, naively, that silicon had a very high ...
2
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4answers
234 views
Playing a small MP3 file
simulate this circuit – Schematic created using CircuitLab
I'm creating a hand-held device with a momentary push button that will activate an LED and play a sound or MP3 (I didn't include ...
0
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1answer
65 views
Using chip antennas over a 50 foot distance
I want to build a coin sized receiver that can operate over a distance of 50 feet. I am interested in using a 2.4 GHz ceramic chip SMD antenna, like the one described here
...
4
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1answer
181 views
Is it bad practice to install an IC to the other side of a heatsink?
Normally, we connect an IC to the other side of a heatsink than shown here:
Is it bad to place the IC on the 'unusual' side of the heatsink (and if so, why?) or are both sides each equally ...
1
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0answers
111 views
Any good RSA/DSA chips? [closed]
I would like to find a chip that can do public key encryption/decryption, maybe RSA or DSA. Particularly the key needs to be securely stored on chip. Can anyone suggest some choices?
(Update) Since I ...
0
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1answer
171 views
Which is the cheap and good MOSFET Driver? [closed]
I am implementing a maximum power point tracking (MPPT) algorithm for 100W systems. Here I need good and reliable MOSFET's and MOSFET drivers. I think of using IRFZ44N as a MOSFET for buck-boost ...
0
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1answer
110 views
GDDR5 overclocking [closed]
Why does a GDDR5 memory which is designed to work at 1250MHz gets slow at 1450MHz? Because of ECC check start? Because it is not supposed to work at that frequency(hard-coded?)? Because of some ...
2
votes
1answer
144 views
Simple data connection through powerline wires
In my home/office/business I have a 4 incoming electricity lines, (Government line, private subscription generator 1, private subscription generator 2, home gasoline generator)
I want to send ...
4
votes
1answer
149 views
Maximum number of pins/lands/balls on an IC package?
Background
I'm working on a free universal parts library tool. In an effort to optimize memory use and performance, I'm trying to work out the practical maximum number of pins you'd ever see on a ...
1
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1answer
76 views
Replacement IC for the touch-button QT1081?
A project I'm working on needs several touch buttons. I found the datasheet for the Atmel QT1081, which supports up to 8 capacitive buttons, with the added advantage for our circuit that there are ...
3
votes
1answer
110 views
Replacing 27C256 with 28C256, how to wire /WE?
I am looking to replace a 27C256 compatible maskRom (nintendo Nrom PRG and CHR if it matters) with a socketed 28C256 in order to make a development cart.
It looks like the pin for A14 is in the wrong ...
5
votes
3answers
210 views
Driving LEDs / other small loads with a 74HC06 or similar inverter
I was recently reverse-engineering some firmware (and other bits) from a router, and spotted that the front panel LEDs were driven from a 74HC06 hex inverter gate chip rather than a proper LED driver.
...
1
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1answer
150 views
Why do 7490 and 7493 have gated reset inputs?
Why do 7490 and 7493 have gated reset inputs?
For example: 7493 has two inputs MR1 and MR2. Internally, these two inputs are fed into a nand gate, the output of which is use as the reset ( active low ...
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1answer
68 views
Transmit video from a usb/ttl camera [closed]
I'm currently working on a project which requires to transmit video wirelessly(RF).After I've done tons of research online,I still don't have a clue how to achieve this.
Is there a kind of IC that ...
-2
votes
3answers
81 views
What would a voltage between 0 & 1 do to a AND-gate IC?
If I have a 7400 chip with an AND-gate (0 = 0V & 1 = 5V) would it be seen as 0 or 1 if the input is at 2V and also 4V?
2
votes
1answer
164 views
Does a 7400 IC used as AND-gate use any power when output is 0?
If I have a simple 7400 IC and using it for a single AND operation, would it consume any power when the AND is false and outputting 0V?
If so, to what degree? 20mA or 20uA?
5
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2answers
74 views
Antenna Design Filtering Out UnWanted Frequencies
I was wondering if someone could explain to someone with no electrical engineering background where would one place the resonator whose sole responsibility is to amplify sine waves at a particular ...
