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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39 views

7-segment driving circuit not working as expected

I have designed and built the following 7-segment driving circuit utilising an Arduino Micro in order to try and further understand electronic circuit design: simulate this circuit – ...
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1answer
23 views

help with QT1070

I am using AT42QT1070 touch IC in comms mode with I2C communication.I have used 10k pullups with SDA and SCL line and 47k pullup with CHANGE line(active low) as mentioned in datasheet. The CHANGE ...
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2answers
61 views

How does one reuse a thick film circuit?

I have a thick film circuit from a calculator that I want to use. How can I attach external connections to the sheet? I tried simply using the circuit as a contact in between a battery positive and an ...
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1answer
36 views

SN74LS32N Not Working Correctly

I am using a SN74LS32N as an OR gate in a project, and I have hooked it up to an Arduino, but even when none of the inputs are powered, the LED that I hooked up to the output turns on. Why is this ...
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1answer
50 views

Safe way to wire CMOS ICs together

I have a question about the safety (to the ICs) of wiring the output of one IC directly to the input of another IC. simulate this circuit – Schematic created using CircuitLab For ...
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2answers
59 views

Help identifying connector

I'm making a new prototype PCB that unfortunately has some elements that are prone to failure, so I'm trying to design them to be easily swappable. I'm taking inspiration from this design of using an ...
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3answers
852 views

What simple IC can I use to extract 500ma from a computer USB port?

I have very small and simple electronic projects that I power up using the USB power connectors plus a resistor. For one project I require to use more than 100ma, however the USB port requires an ...
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3answers
96 views

How to detect N pulses? [closed]

I'm looking for a way to trigger an action when approximately N pulses have been received, where N is a large number - in the range of tens of thousands. I don't want to use counters, so I'm thinking ...
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1answer
36 views

Purpose of the Latch Enable (\$\overline{LE}\$) and Ripple Blanking (\$\overline{BI}\$) pins on 74HC4511

I am looking at the datasheet for the 74HC4511 (available here), and I am confused by the usage of two of the pins: Firstly, the "Latch Enable" pin (\$\overline{LE}\$), and secondly the "Ripple ...
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2answers
55 views

How do wafers translate to computer hardware? [closed]

I am trying to figure out the relation between wafers produced in a fab and computer hardware.
2
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2answers
260 views

Quad 2-input NAND-gate Not seems to work

I have recently bought this IC: It's a NAND gate. So just to be clear, we agree that if both inputs are 1, the output will be 0. (The IC is a Quad 2-input NAND-gate 74HCT03, the datasheet can be ...
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2answers
62 views

Play PCM stored in EEPROM without microcontroller

Is it possible to connect digital-to-audio converter with a EEPROM storing PCM data to play that data with a speaker? I am interested in a solution that does not employ any kind of microcontroller. ...
2
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2answers
561 views

Will a large capacitor damage a circuit

I have 32 servos running from a 7.5V battery rated at 2500mAh and I'm sure that it has enough power to handle the servos, but it doesn't look like it can handle all of the servos pushing at once. I ...
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2answers
65 views

1bit Full Adder Cell in IC not working as supposed?

I got an adder cell, which in IC mirror layout is this: EDIT: Transistor-level, standard adder circuit: Which I actually made in IC like this: It's not working as it should! I labelled it ...
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1answer
57 views

Trouble with phase locked loop: phase comparator is just showing the VCO output (with picture)

I am using the CD4046BC for the first time, and do not understand something that is happening. I am using the type I phase comparator, which is just a simple XOR logic gate. When I have the input as a ...
21
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6answers
3k views

Why have two NOT gates in series?

I have recently been looking at the datasheets for the 74HC139 IC in order to see if it was suitable for my project, and have come across the following logic diagram which strikes me as a little bit ...
4
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1answer
173 views

Why two inverters cascaded in multiplexer control signal terminals?

Why cascaded inverters are used in the multiplexer when it is possible to realize the circuit using a single inverter.
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1answer
159 views

Identifying an IC with markings: 0270000 DCP1227 0601

I have a chip on one of my boards, and I cannot identify it. I tried differnet variations of search patterns but I cannot find it anywhere. The marking on the chip are in three rows as following: ...
2
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2answers
79 views

When powering a Nrf24L01 hooked up to an arduino by external battery does ground still go to the Arduino ground?

So as mentioned in this article, the radio chip might have power problems and an external power source is recommended: http://arduino-info.wikispaces.com/Nrf24L01-2.4GHz-HowTo My question is for the ...
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2answers
42 views

Best temperature storage IC? EEPROM or SRAM IC

I am trying to integrate a temperature sensor along with the storage capability with it. Both temperature sensor and the storage device will be controlled by FPGA. Which device would be the most ...
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2answers
516 views

What is this part in 556 die

I ask this question, just out of curiosity. In this die of 556 IC, what are the wave-like squiggle at the four corners, and two more on the top?
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2answers
66 views

Learning electronic circuit design [closed]

Is there a good website or book to learn electronic circuit design from the beginning. I would like to learn more about basic electronic elements and how to use transistors appropriately in my circuit ...
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0answers
25 views

What are the tradeoffs for replicating cores using translation, rotation, or reflection?

When reproducing a cores on a chip multiprocessor, what are the tradeoffs for how the design is oriented, i.e., whether it is simply slid into a new position (translation), rotated 90 or 180 degrees ...
2
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1answer
36 views

Eliminating Signal Race Hazard in an IC dynamic latch/register!

I work in MAGIC Integrated Circuit software at layout-level. I got an 8bit dynamic register made of 1bit dynamic flipflops that write input on the positive edge of the signal: (Note: I used ...
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2answers
51 views

Can I safely operate a PLL below it's “minimum” RF frequency?

I was wondering if anyone has had luck operating a PLL below the spec'd minimum RF frequency. For example, Analog's ADF4107 PLL specs 1-7GHz RF input frequency, but I don't immediately see why it can ...
2
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1answer
128 views

What is the function of the given IC?

Which Type of IC is this one ? what is its function
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2answers
125 views

Multi MOSFET IC for Controlling 12V LED strips with Arduino [closed]

I am planing to make an arduino shield for some Home Control jobs (Switching 433MHz RC Sockets, Measuring the Temperature, check if Windows are closed and controlling some RGB led Lights.) My base ...
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4answers
816 views

Why are relatively powerful chips used for simple tasks like playing a song?

In a book my Michio Kaku (called Physics of the Future) he makes the claim that a chip in a birthday card that sings a song is more powerful than all the computers the allied had in 1945. Now, I ...
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2answers
70 views

How to sink current to drive 7-segment LED using a 4026 chip?

Am referring to this project here; http://electronicsclub.info/p_random.htm with a schematic like so; Key points: Resistors are not required for the LEDs because the 4026 IC limits the current to ...
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1answer
73 views

Voltage level too low for MAX232

I'm trying to connect TI's MAX232 to my Arduino so that I can communicate with my PC. I have connected it exactly as the picture shows: Tx/Rx are not connected because I just wanted to see if I can ...
2
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1answer
59 views

Does L293D consume power when not in use

I am designing a robot using the L293D motor driver, and I have just successfully hooked it up to my micro controller. I am using two batteries, one two control the motor and one to control the pic ...
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1answer
65 views

Integrated Circuit Layout Design - Dynamic Flip Flop?

I need to create a dynamic flip flop like this: In integrated circuit technology, at mask layout level. I then want to create an 8bit register, using 8 of these flip flops, with a common CLK ...
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2answers
86 views

The AND gate 7408 electrical engineering

I put an AND gate on my breadboard with all connections correct. I also mounted two switches (SPST switches) at the inputs. My problems is when my two switches are on (the button pressed) the LED is ...
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2answers
44 views

Is the LT8500 a current source or sink on its PWM outputs?

I am using the LT8500 as an LED driver and I need to know if the leds are current sink or source. Also if I need to have resistors in serial with the PWM outputs since the output voltage is 4V. I've ...
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0answers
22 views

What is JTAG TCE signal designed for and what effect does it have on the boundary scannable IC?

I know for fact that some boundary scannable ICs don't have this JTAG TCE input signal but some does. Does any one know why?
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2answers
88 views

Driving MOSFET of 3.3 V gate voltage with 1.8V PWM pulse [closed]

My micro-controller is giving a PWM output of 1.8V. I need to drive a MOSFET with typical gate voltage of 3.3V. I am planning to use two cascaded switches (NOT gate configuration). I have checked ...
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0answers
60 views

Relay needed for an input ot 0.15 V

sorry about the question but I'm a beginner here. I have a very low DC voltage of 0.15V and I want to use a relay with in a simple circuit to light a LED. I'm learning in how to build circuits. So ...
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1answer
99 views

Voltage regulator IC capabilites

I want to convert unregulated 10-14V DC to 5V DC and 12V DC regulated(constant) supply;This is a buck step down regulated voltage supply IC it outputs the voltage that I require. Is this IC all I ...
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0answers
22 views

DG202BJ IC Voltage changes

I am using a DG202BJ IC. http://www.vishay.com/docs/70037/dg201b.pdf I connected pin 5, 6, 7, 8 to ground. V+ = +10 and V- = -10 IN1 = IN2 = IN3 = +5V; S1 = S2 = S3 = -5V When I check the output ...
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6answers
821 views

What is the function of the resistor in the below circuit?

What is the function of the resistor R13 in this circuit?
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0answers
27 views

Powerline modem ST7580 single channel mode

I'm trying to implement a powerline module with the ST7580 modem. There is a passive and active filter design in the application note laid out which I plan to modify according to my desired carrier ...
3
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2answers
106 views

What does this dash mark in a DIP 4-bit counter IC indicate?

I have seen a dash mark in 74LS193 4-bit counter IC while working with it in a project. What does this dash mark indicate?
0
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1answer
57 views

how to create a and gate circuit

I have a 4.5V source. I connected + terminal to a 15ohms resistance the resistance is connected to the + end of a green LED, the - end of green LED is connected back to the battery to make the circuit ...
2
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0answers
72 views

What components do I need to wirelessly transmit a small signal via Bluetooth? [closed]

So I'm doing a project trying to create a wireless Electrocardiogram (ECG or EKG) system. I built the hardware, connected it to a human subject, and it works perfectly - you can see the heartbeat ...
2
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1answer
68 views

Heating and Chilling ICs instantly from 200C to 0C? Does it damage the silicon inside?

I soldered VCXO oscillator and suddenly tried to cool it down with a cooler spray. Do you think that sudden cooling and heating damages the chip. The heating and cooling were well within the spec ...
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1answer
41 views

Moore's law: relationship between transistor count on an integrated circuit and minimum feature size

I'm doing a project about Moore's law, looking at physical limits of the technology / materials we're using (photolithography for example), the limit you'll come to is the minimum feature size. For ...
2
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2answers
74 views

Upper limits to chip size

This question on physics.stackexchange has an answer, which has a piece of information which is new to me: Now, you could say "OK, let's increase the chip size instead". It turns out that it's ...
3
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1answer
61 views

Building a small 4-bit adder on a breadboard

I am very new to using IC and basically a breadboard in general, but I am doing a project on how computers add and thought it would be nice to have a practical demonstration. My main question is, for ...
2
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2answers
79 views

Provide full specifications of the given IC?

I have searched a lot in the internet about this IC, but I didn't get any answers. The markings are: 9903AJ DM74LS94N
16
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2answers
1k views

What is the point of a small mark on a DIP IC opposite the pin 1 indicator?

I have seen an unusual mark on an IC. Can anyone tell me does it have any functional or testing significance?