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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What chips do 3$ wifi dongles use? [on hold]

I saw lots of WiFi dongles withing the price range from $2,50 to $3,50 (eg. this one). I am current doind a project using a microcontroller with usb, that requires WiFi. I'm interested what kind of ...
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37 views

What solutions are available for generating video signal?

I'm looking for a video chip that could handle VGA resolution. It should be able to provide VGA, HDMI and Composite video out. It needs to have some basic hardware acceleration eg. built in support ...
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0answers
37 views

How to check if an IC is broken?

I have currently the problem that on one of my pcbs an IC behaves strangely: It is a 74LVC8T245 for transforming voltages. When I set \$\overline{OE}\$ to 0 and DIR to 0, it should use B as input and ...
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2answers
31 views

When a datasheet specifies output current is it per pin or aggregated for all pins?

When a datasheet specifies something like output current, as with the 74FCT244 or for example, is this referring to the aggregated output current between all pins or the capacity of a single pin ? ...
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1answer
42 views

Binary Counter IC Counting Incorrectly

I'm currently trying to use 74HC163 in a project, and it appears I have it wired up correctly, but it counts in a very strange sequence. I wrote down the sequence as follows: ...
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4answers
167 views

How to implement 8-bit 2:1 multiplexers on a PCB?

I need to implement a 2:1 multiplexer for 8-bit data. That is: as inputs it should take two 8-bit numbers and a Select line; and as output an 8-bit number. I could use two 74HC(T)157s (this is a quad ...
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0answers
24 views

PWM Chopping current and Decay Modes of motor drivers

This is my first experience with driving stepper motors, so please bear with me. I was looking again through the datasheet of the stepper driver DRV8811 and came across calculations that needed to be ...
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2answers
30 views

Different digital signal input voltage than running voltage

I assume running an IC at one voltage (3.3v), and having the (digital) signal input be at a different voltage (5v) is fine. If both of these voltages are within the operating range of the chip, am I ...
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0answers
47 views

LM8560 not putting out enough power to seven segment display

I have built a digital alarm clock using an LM8560 chip, the chip however does not seem to output much voltage to the display. To solve this problem I had transistors connected to each of the legs of ...
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2answers
83 views

Can a digital multimeter damage a powered circuit when measuring resistance?

I wanted to make sure my ESD wrist-strap is in working order. So I tested like this: Connected the wrist-strap to household ground (via wall socket). Measured the resistance between the wrist-strap ...
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0answers
36 views

Lane size vs Pad size

Currently I have a problem with routing a 56-pin-µC with eagle on a board. I want to make the supply lanes a bit broader than the signal lanes, but the suggested pad size of the µC is already 0.012, ...
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3answers
84 views

How to measure the bonding wire inductance in lab by myself?

Very curious about the IC design. Everytime when we get our chips , we always need to bond wire the chip to connect the PCB. Even though the factory always claims that the bonding wire is 0.8nH/mm for ...
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1answer
68 views

Identifying 6 pin SMD package

I need some help identifying this SMD component. it says k1(maybe k1: ), and has 6 pins. It was found on laptop's motherboard (Asus g73).
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1answer
92 views

open collector digital output

I have a digital output board design which has 32 open collector (sinking) outputs which can be connected in parallel to drive a resistive load. The collector of each output transistor is connected to ...
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2answers
58 views

is there any analog voltage reading ic present? [closed]

In arduino analogRead() reads voltage from 0 to 5 v and gives 10 bit output. Is there any IC which is specialized for this function only?
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1answer
50 views

How to generate bar using decoder

Ic74154 decoder generate active low o/p i.e for example if input is binary 5 , 4 becomes low. I want a circuit which will give output when i/p is binary 5 then o/p is low for 0 to 4.It is possible by ...
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1answer
56 views

Subwoofer Amplifier Circuit [closed]

I've had asked many sites but they don't leave any answers. I want to build a subwoofer only without using a crossover and I want to know what should I include in the power amplifier circuit. Can ...
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1answer
45 views

Question about a dimension in this IC package drawing

this is the first time I'm making a PCB layout, so I'm not too familiar with datasheets. The picture below shows a diagram for an IC I'm using. The datasheet says all dimensions are in mm. However, ...
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0answers
48 views

Where to find ICs in package sizes good for soldering? [closed]

I'd like to know the best places to find ICs that you can solder with. A lot of the package sizes I come across are way too small to solder by hand. I prefer through hole and sockets (like pdip), but ...
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2answers
208 views

Do I have to power-on reset CMOS counters?

I am designing a project that contains several CMOS counter ICs (CD4017 specifically). What is the state of the counter on power-on? Do I have to incorporate circuitry that pulls the reset pin high ...
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2answers
117 views

Negative voltages in the real world?

I was given the task to design a circuit that has a 5V input and uses a differential op amp to provide an output that oscillates between 5V and -5V. The design I came up with is the following: ...
2
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1answer
62 views

Using LiPo cells without a protection circuit

I designed a PCB to provide the power circuit for my robot's servos. This has a LiPo battery protection IC (undervoltage/overvoltage) and a voltage regulator IC. I sent this PCB in to be manufactured, ...
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1answer
61 views

Low Pass Filter With Hall Effect and ADC Help

Background: I am using the Allegro ACS758KCB-150U hall effect based current sensor, here is the datasheet, I am using it to measure current drawn by 24V motors, between about 20A - 130A. The reason ...
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1answer
68 views

How to calculate electric current in this electric circuit?

Ok here is the problem. I have this circuit ( picture below ) and I need to design buck converter for it. I was told by my mentor that I should calculate electric current this circuit will consume. ...
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0answers
32 views

Datasheet for Panasonic MN6627971KB

I have been looking for a datasheet for this chip Has 4 printed rows of text as follows Panasonic MN6627971KB 515U5031 JAPAN 128 pin located in a car audio system. Could be a model specifically ...
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0answers
25 views

How to choose a single H-Bridge IC?

They all seem to pretty much offer the same features. On what basis am I supposed to compare single H-bridge IC's for a typical application of driving a smaller (<1A max) brushed DC motor, similar ...
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2answers
337 views

Add delay in circuit

I am using a Light Dependent Resistor (LDR) and a laser to make an burglar alarm system. My laser continuously projects beam on LDR and when the beam is interrupted the LDR starts to ring the ...
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2answers
134 views

What's wrong with my switch mode power supply circuit?

I'm using a TPS54383 dual output SMPS IC from TI, putting out 12V and 5V; at least in design. I created a schematic and board and had it sent out to OSHPark and soldered it all up today and only the ...
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1answer
79 views

What's the difference between IC 74HC04 and IC 74AC04PC?

I am trying to make a simple logic gate simulation for which I require the former IC but I could only procure the latter. Will it still work?
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5answers
207 views

How to drive 30 LEDs with a smaller amount of pins?

We have 30 LEDs in a row, and we want to turn them on left to right. However there are way to many for the Arduino to have each one on a different pin. Is there an IC that can take a binary output, ...
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2answers
33 views

Multiplexing buttons using shift register - high impedance output

I have experience with 74HC4094, and I believe the 74HC595 is essentially the same - the datasheet says they have "tristate output", but that is only when OE is low - then all pins are tristate. What ...
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2answers
81 views

Why we need 100n cap parallel to IC power supply [duplicate]

I've seen this in many schematics, I also do it myself, but I don't really know why it's needed. I've also noticed that on RGB led strips, there's tiny 100nf caps, too. Why is it needed? Also, if ...
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3answers
753 views

Why does this EPROM have comb-like structures around the wire bonding pads?

I took some pictures of a Microchip EPROM die from the late 80s / early 90s (I can't recall the exact part number). The wire bonding pads are surrounded by a comb-like structure. What is the purpose ...
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2answers
32 views

Question about the current flow and voltages in a simple NAND diagram

I've so far learned about boolean algebra and its applications to transistors. This is a picture of a NAND diagram: A NAND has this boolean property : \$ f(A,B) = \overline{A \cap B}\$. What I want ...
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1answer
95 views

What is the difference between Vio and Vcc in an electronic circuit?

Can someone please explain the difference between Vio & Vcc and what do they stand for ? Edit: Modified my question based on the first comment.
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2answers
91 views

Replacing resistors with active load in active filter

I am building a low pass filter IC in 0.25 micron CMOS. My design requires 14 Mega-Ohm resistors. I want to replace them with an active load in order to save space. If possible I would like to use a ...
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1answer
51 views

Question about IC regulators [closed]

I have a basic question about IC regulators that I know someone here can answer. Basically if I had an IC 7812 regulator in a circuit that has an input voltage of 14 volts, would the output voltage be ...
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0answers
43 views

Discrete MOSFET driver control IC

I am building a Marx bank, which consists of multiple MOSFETs connected in parallel when charging and in series when discharging. I have each stage of the pulse generator designed, including isolated ...
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0answers
30 views

How to preserve MSL 3 devices

I have bunch of ICs that is rated MSL3 that came in a moisture barrier bag. For an urgent work, I needed to open the package to use one device. Could anyone tell me how I should preserve rest of the ...
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2answers
54 views

Choosing resistor values for a 555 timer

I have to design a frequency counter using a 555 timer as a pulse generator. I included a schematic for part of the circuit, but this is my first time using a 555, so I also included the original ...
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2answers
66 views

Reverse biased capacitor on IC input pin

I am looking at the test circuits on the data sheet for the AN6884 VU meter IC, and I cannot understand the connection to pin 8 in the following diagram: Pin 8 accepts a positive input voltage. The ...
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1answer
168 views

What is meant by output Leakage Current?

Is output Leakage Current= Output Current - Input Current? I encountered the term in a datasheet of the L9938 driver.
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1answer
135 views

3v3, 12v Smps: “Design ok!” “Pcb ok!” Why not stable? Please Help

Im working on a project and i need 3v3,5v and 12V in this. I though smps circuits would be better than Linear Regulators. So i choose LM2676-adj IC. I designed schemetics for 3V3-3A SMPS and 12V-3A ...
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1answer
68 views

Equivalent of IR2155

I build a circuit based on IR2155, but it's not so readily available in my area. Is there an equivalent IC for IR2155?
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1answer
68 views

Bypass IC output to give an LED a voltage boost

I'm attempting to modify a circuit in an existing device, the relevant part of which looks like this: The IC controls the LED brightness, as well as having connections to other things. I have ...
2
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1answer
71 views

Is there relation between logic chip names and their internal structure

I know that for instance an ATMega328 is a 8 bit MCU with 32k of program space, the same can be said for most other MCUs and some other ICs with a direct relation between the name and internal specs. ...
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1answer
68 views

Undefined part of CSR8645 chip

I am trying to build a bluetooth audio headset and decided to use CSR8645 chip, but while trying to understand diagram of this chip i couldn't identify one part of it. I am uploading picture ...
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1answer
204 views

Monolithic and Hybrid Integrated circuits

I was told by my professor that ICs can be of two types, monolithic and hybrid and then she went on to explain technologies of fabrication. What is the difference between a monolithic IC and a hybrid ...
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1answer
232 views

What are Vcc and GND on a shift register?

What are Vcc and GND on a shift register? I thought that I had to provide a positive voltage to the IC via the Vcc, but turns out that I can operate my shift register without powering the Vcc. ...
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1answer
609 views

What's this component?

What is this component?(U6) Source