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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1answer
34 views
How to wire the REF200 IC for a 100uA current output?
I am trying to create a 100uA constant current source to power a homemade sensor. I bought a few REF200 ICs http://www.ti.com/lit/ds/sbvs020/sbvs020.pdf since each has two 100uA current sources. ...
0
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0answers
26 views
Differences between HC-SR04 and SRF04
I'm going to make a project using a PIC18F4550 and a HC-SR04 ultrasonic sensor to measure the level of an open oil tank and want to use proteus to debug the program of the microcontroller, proteus ...
0
votes
1answer
58 views
PIR Detector Controller IC
Honestly, I have a good deal of questions so this may not be for the faint of heart.
I will do my best to ask them in a logical order with specific language. I really appreciate the helpful ...
1
vote
1answer
76 views
XOR gate with NAND
I am attempting to build an XOR gate with NAND ICs. This schematic
is how I am wiring up the IC (I know the schematic is a little confusing but I tried to construct it best I can).
I am ...
2
votes
4answers
120 views
Edge triggering seems to me leaving every circuit in an inconsistent state?
I was informed on this forum that edge triggering could be a solution for multiple propagation in a circuit with feedback (the output wired back to the input).
But to me edge triggering seems to ...
1
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1answer
70 views
Bottom half of IC appears not working?
I have a NAND logic gate, the top 6 pins appear to be working fine (4x Input, 2x Output) However the bottom 6 pins on the IC appear not to work.
I was testing the IC via an LED, connecting two high ...
1
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1answer
62 views
What kind of failure would I see in moisture sensitive parts?
I am reflowing a design on a electric skillet. When the uC and LED parts arrived, they were in moisture sensitive packaging. They were in sealed bags with moisture indicator cards. After I opened ...
0
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1answer
51 views
Looking for an on/off digital toggle signal chip
I am looking for a chip that will enable me to input 3-12 V DC on 2 pins (+ and ground input), to get as output on 2 other pins, the exact voltage i put in those previous 2 input pins (+ and ground ...
0
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1answer
47 views
How do you supply a PMIC beyond its voltage limit?
I'm using a power management IC (PMIC) with a lower max Vin than I want to supply. Is the solution to this as simple as adding a separate, greater voltage regulator in front of it?
1
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4answers
98 views
Is there an IC chip to toggle through three outputs?
I am making a simple circuit (14 LED's that will create a chase effect), however, I wanted to do it without following any tutorials, to test my skills. I ran into a problem. In my circuit, I have all ...
1
vote
3answers
121 views
Half-Adder Digital Logic: Not as Expected
In a lab for an "Introduction to Electric Circuits" course, I built a simple Half-Adder circuit using an 74LS08 IC & 74LS86 IC. However, I'm experiencing issues with the output.
My ...
5
votes
2answers
118 views
Why ceramic IC packaging?
As someone with no background in electronics whatsoever, I wonder:
why are ICs packed inside ceramic or plastic? I thought we wanted the heat to go out as fast as possible, and ceramic is a good ...
0
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3answers
62 views
Reasons of more than one ground pin in L293
Why in L390 they provide four pins for the ground and the heat sink? For heat sink,is only one pin is not sufficient? Here is the datasheet
http://www.ti.com/lit/ds/symlink/l293d.pdf
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2answers
141 views
Integrated Circuit Size Estimation [closed]
How would I estimate the minimum size of a custom IC whose size is pad-limited with a large number of pads?
(Pad-limited means that the minimum die size is dictated by the size of the inputs and ...
1
vote
1answer
58 views
How to connect ASD bios chip
In my little box full of various electronic components I've found an AMIBIOS chip from 1995. The actual chip data are the following:
Vendor: ASD
Number: AE29F2008-12
Another number: 9846
I want to ...
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0answers
46 views
locating broken ICs on board [closed]
A friend of mine got his hands on an old "hook a teddybear" machine. The problem is, the hook wont go down.
I assume that maybe some of the components on the board is broken.
How do I locate the ...
0
votes
1answer
59 views
Simple circuit to give a pulse to a IC pin once?
I have an IC that is activated when pulsing a pin high, the pin should be keep floating after the pulse. The circuit is powered using a battery, and that IC then wake up everything else (Regulator, ...
0
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1answer
52 views
How do I choose which version of the IC MT8870 should I use?
I am following this guide to hooking up a phone to a circuit, depending on the DTMF tones. However, when I went to buy one, I realized there were lots of different "editions"/models.
Which one should ...
1
vote
1answer
77 views
Soldering IC directly to stripboard
I picked up my first "from-scratch" DIY electronics project in a long time, building a 2-tone door bell on stripboard with a basic 555 circuit.
For the most part everything went well. I assembled the ...
2
votes
4answers
110 views
Widely available IC for encording and Decoding DTMF data
I am planning to do some research in data transmission over the air. For this I am interested in DTMF encoding and decoding.
Is there a widely available IC to achieve this? A circuit diagram using ...
6
votes
3answers
115 views
How is “Overtemperature shutdown/protection” implemented for ICs?
IC data sheets often give some informations about the circuits over-temperature protection. Lets take a Microchip LDO (MCP1702) for example:
"...If the power dissipation within the LDO is excessive, ...
5
votes
2answers
77 views
Can I control a 12V motor from arduino using an H-bridge?
I want to control my 12 volt geared DC motor from my Arduino Uno. I want it to be able to rotate both directions as I'm intending to use it for a robot.
Can I use the L293NE H-bridge in this case? ...
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2answers
87 views
IC buffer like 4066 with 8 or 16 switches
I have a computer and two monitors. I want to build a device so that I can switch between to monitors. I would use buffers (like 4066) and a microcontroller. Is there any buffer like 4066 with 16 or 8 ...
4
votes
2answers
97 views
How is lithography actually used to “print” transistors?
In one of my classes, we skimmed over lithography, but mostly the optics side of things (the diffraction limit, liquid immersion to increase angle of incidence, etc).
One point that was never ...
19
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4answers
1k views
Why would a modern digital clock rely on mains frequency?
I am in the military, stationed in Djibouti, Africa. We generate 240V/50Hz power on base, but some buildings also have 120V outlets, which I assume is transformed somewhere else on base, probably at ...
6
votes
1answer
129 views
How does multi-core CPU implement asynchronous coordination?
I am coming from computer science background and wanting to study process calculus for use in asynchronous circuit design.
So, I am looking around the current practice on asynchronous circuits.
There ...
3
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2answers
128 views
Why N-channel MOSFETs are better than P-channel MOSFETs?
Besides the reason that electron mobility is higher than hole mobility, what are the other reasons of preferring an N-channel over a P-channel MOSFET?
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2answers
112 views
How do you make a shift/scale circuit using a transistor, resistors and a voltage source?
Given a resistive element that fluctuates between 0 and 10kOhms, a PNP transistor, a 20V source and a bunch of resistors, is it possible to construct a circuit with an output voltage as follows:
1) ...
6
votes
1answer
170 views
Solution for detecting a magnetic field
I have an Arduino based circuit that performs a mechanical job and I'd like the circuit to turn on when it detects a magnetic field. I want to use a magnet as a trigger for the circuit. When a magnet ...
4
votes
2answers
118 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 ...
12
votes
2answers
430 views
How did handheld video games from the 70's and 80's work?
I'm curious about how the early handheld video games from the 70's and 80's worked. You know, those small games with a LCD display with "fixed elements" meaning it was hard wired for one (or a small ...
2
votes
4answers
115 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 ...
0
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2answers
126 views
Multiplex two I2C ICs into four 7 Segment displays
I currently have two PCF8574AN I2C 8-bit IO expander 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). ...
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1answer
87 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
197 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
votes
2answers
63 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 ...
0
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0answers
61 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
votes
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, ...
2
votes
1answer
54 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
76 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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votes
4answers
140 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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votes
1answer
98 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
0
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1answer
71 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
48 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
vote
1answer
158 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
162 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
votes
2answers
307 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, ...
1
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1answer
66 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 ...
0
votes
1answer
45 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
votes
3answers
230 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 ...
