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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Using an analog demultiplexer as a digital demultiplexer

If I want to use an analog de/multiplexer as a digital demultiplexer, do I have to use pull-up / pull-down resistors? For example when driving a CMOS IC like the 4015 with the CMOS analog 4051, do I ...
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2answers
62 views

What value determines the current flowing between two interconnected ICs?

If I connect two ICs (lets say two Arduino UNOs with one pin configured as OUTPUT and another as INPUT), something must limit the current so that there is not a short circuit when driving HIGH. What ...
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2answers
83 views

What are the holes on an optical flow sensor IC?

The right hand image is a flow sensor IC for an optical mouse available from Sparkfun. On the left is another optical flow IC with a camera attached from a Chinese distributor. It seems that the ...
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1answer
42 views

Why does the l293 have a higher current than the l293D?

I know the "D" mean diode, so it has a built in diode. I would not think that the addition of a built in diode would lower the current rating by that much. Also, if I were to use a l293, where would ...
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0answers
40 views

Internet of Things - Urinalysis in the toilet plate [on hold]

I was thinking it would be a nice idea if a detector like this can be installed inside the toilet plate and connected to a Raspberry PI for example. I was wondering though, what is the best place I ...
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3answers
96 views

AND Gate IC 7408, the number means?

Why it is 7408? What does it mean? Why it is used for AND Gate?
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22 views

When wiring an anlogue switch to grounded button, which goes to Y and Z?

I'm wiring an analogue switch (74HCT4066N) to throw a grounded switch. The datasheet says that the recommended Vsw value should be between GND and Vcc. This means that it's important which of Y or Z I ...
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1answer
30 views

Modifying memory of an integrated circuit

The integrated circuits of EMV-chips (normal credit cards) claim that their memory is physically protected, is it possible to make an integrated circuit in which the memory can only be modified and ...
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1answer
20 views

CD4017BE output pin question

I am designing a circuit which uses a CMOS decade counter to activate and deactivate pairs of transistors in turns.The problem is:will the IC be damaged if the current of one of the outputs(activated) ...
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13 views

RFID Module Integration

Disclaimer - I am very very new to Electronics (literally a week), but am doing a lot of reading to try and catch up with the knowledge I need for my eventual project. Background: I run a lot of ...
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1answer
31 views

How do electrical signals not get out of sync in CPUs and other integrated circuits?

I'm a newbie at electronics and this question has kept me occupied for a while: How do electrical signals not get out of sync in integrated circuits and CPUs? For example, let's take a look at 3 bit ...
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5answers
1k views

Silicon bugs, errata sheets

In many (most??, all??) microcontrollers that I have used over the past years, there where sometimes some silicon level bugs, and the manufacturers provide the engineers with the errata sheets, ...
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2answers
34 views

CD4017BE IC datasheet confusion

I am going to incorporate this 4017 in a circuit and I have downloaded its datasheet,but I can't understand some parts of it. What is the max Vdd current? And the max current & voltage of the ...
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2answers
34 views

Picking battery for power amplifier

I have bunch of TDA2003 (class AB) amp ICs and I would like to make some amplifiers with them. One would be stationary bridged 20w version and one portable version. However I'am a beginner and I never ...
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1answer
46 views

Shift registers, flip-flop, Multiplexer & Demultiplexer with microcontrollers utility

While i read alot about the popular 74HC595 shift register and its use for multiplexing i can't find anything about the following chips: MC14053B Triple 2−Channel Analog Multiplexer/Demultiplexer ...
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1answer
56 views

Is there a shared lead AND Gate IC? [closed]

Hi I'm an electronics hobbyist still learning some basics of digital logic. I'm looking into building an arduino shield, but I want the arduino pinouts I'm using to be accessible when the shield is ...
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1answer
52 views

Datasheet assistance request

I'm trying to incorporate a USB-PD controller into my design for a Dual Role Port (DRP). I'm currently building with a Cypress CCG2 24-pin QFN, and using their reference block from the datasheet found ...
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1answer
37 views

Placing covered vias routing signals under microcontroller termal pads

Placing covered vias routing signals under microcontroller termal pads is a good practic? I mean to reduce soldered termal pad area to center(connected with vias to gnd) and place covered(with ...
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2answers
259 views

Is there an audio amplifier chip or circuit that amplifies certain amplitudes in a signal less or more than other amplitudes?

Like for instance, that would amplify on an exponential curve where the lower amplitudes get the maximum amplification and the highest amplitudes would get no amplification? Is there an analog chip ...
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2answers
101 views

does half bridges ICs exit?

i can't find any half bridge ic (with integrated fets) for low power (2w around 12V), all i find is full bridges for the same power magnitude. and i don't even find them under the name of full bridges ...
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1answer
59 views

Using a LS248 7-segment driver, but segments are dim. Can't figure out why

I'm building a project where I want to use two double-digit 7-segment-LED displays (green, common cathode). From what I've read, a shift register wouldn't be able to source enough current, so I ...
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1answer
55 views

Integrated-circuit identification

I need help identifying two SMD parts. One says (1G5) and the other says (1P) they each have six pins.
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38 views

movement decision taken upon the light seen by a line follower robot

I'm working on a line follower robot and it has to check traffic lights every estimated distance and a decision of whether to move or wait is to be taken upon the current state's light of an external ...
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1answer
91 views

Where can I find an ic at home relevant to my project? [closed]

I am fairly new to electronics but I have a decent understanding of how basic components work. I want to start building my own audio equipment as fun projects and for actual use in my home studio ...
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1answer
71 views

Need help identifying an integrated circuit

Pulled from a large tube TV, this one is a real head scratcher. I think it's an RCA chip but all RCA chips I've see use a different part naming scheme (for example ...
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1answer
55 views

ASIC Power supply requirements

I am a newbie in ASIC design process and have a question. What is difference (or pros and cons) of shorting the voltage supply pins(which have the same voltage requirements) in package level or in ...
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82 views

How are microcontrollers designed? [closed]

I've always wondered the steps involved in designing a microcontroller. Let's say one wanted to design a dedicated motion control chip, would this be "hard wired" into the chip? What kind of software ...
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7answers
4k views

Why is my circuit so incredibly sensitive to electric fluctuation?

I recently finished building a circuit showcased in a beginner’s electronics book. I have included the picture of my creation below because I think it may become relevant to the question. At the ...
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1answer
58 views

How does an open-collector gate work by using resistors?

I understand that that the purpose is to drive multiple signals to a wire bi-directionally. The two logic states are either 0 or flow (high-impedance). However, how do resistors come into play for the ...
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2answers
284 views

Trouble getting 555 timer IC circuit to work properly (Make Electronics Book Experiment 18)

I am currently reading a book titled “Make: Electronics”. This is an electronics book whose target audience is supposed to be complete beginners. One of the book exercises (Experiment 18) includes a ...
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2answers
37 views

Pad and soldermask dimensions in PCB design

I found that usually on BGA package and on a lot of QFN datasheets are provided IC and PAD-IC dimensions and not advised PCB-PAD dimensions and soldermask dimensions. Can someone tell me a good rule ...
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67 views

Who has manufactured this IC?

This is a RF receiver IC from a cheap Chinese radio controlled toy. I am not able to figure out whose logo this is.
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0answers
27 views

Send unique ID when powered (low-power)

I'm looking for a simple chip that simply sends its unique ID(eg.: number) when it powered. Thus it uses iPhone's line-out plug, I only have less than 1.5V. (Or 0.894V, I checked on Wikipedia, but I ...
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0answers
26 views

Bootstrap capacitor selection considering parasitic current

I have been trying to determine how to calculate a bootstrap capacitor value for a synchronous gate driver IC implemented for a buck converter. I understand the the demand of the MOSFET gate itself ...
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1answer
37 views

Shift registers, understanding parallel-in serial-out

I have the 74hc597 parallel-in serial-out (PISO) shift register. The datasheet can be found here. I have a general idea about how serial-in shift registers (SIPO) work, but I'm having trouble ...
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67 views

A general purpose 16-bit shift register

I cannot seem to locate a general purpose 16-bit serial-in parallel-out shift register that is still being made. Although there are plenty of LED drivers that can adapted for the purpose. All I need ...
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1answer
87 views

Circuit help. I want a Voltage gain from 5 volts to 10 volts.

I need some circuit help.. I am trying to boost my voltage from a 5v source to a 10v output so I want a Gain of 2. I Ran the simulation and built the circuit exactly how it is shown in the figure ...
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0answers
36 views

AN-101 IC obsolete ? No description or design available

I have some of these ICs lying around over a decade, received as surplus from somebody. They are marked 'PROCON AN-101' Despite detailed search on internet, can not find pinout, description or any ...
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1answer
100 views

How do I design 5-to-32 decoder using 2-to-4 decoder?

As there are 32 outputs in 5-to-32 decoder so I will have to use 32/4 = 8, 2-to-4 decoder. But then I have total 16 inputs. As I want to create 5-to-32 decoder so I need only 5 inputs, what do I do ...
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1answer
48 views

Why is Leakage Current Important when a MOSFET switch is “ON?”

Referencing ADG5206. ADI has specs for Drainage Current at the Source and Drain when the switch is OFF. They also have channel leakage for Source and Drain when the switch is ON. Why is it important ...
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3answers
59 views

PCB Integrated Chip Question

Hi I am building a PCB using eagle and its the first time I am using an IC. Two questions arose. Do I need to connect the IC chip's ground, because eagle did not do it? Do I need to make sure all ...
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1answer
57 views

Can you implement WLAN on a ZigBee chip?

I've spent my afternoon browsing around the web looking for a microcontroller that has integrated WLAN (802.11), but I haven't managed to find any on the market. There are lots of cheap ...
0
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1answer
72 views

why there is no quad 1-to-4 demultiplexer?

I have 4 input signals to route on 4x4 outputs. it's not a 1-to-16 demux what i'm looking for. Outputs must be selected 4 by 4. is there any demultiplexer that can do that on one IC ? I didn't find ...
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2answers
42 views

Memory design with 4 256K X 1 Bit IC's to a Z80

I have a couple of memory IC's lying around (16 of them) which I would like to use in my homebrew Z80 project. These IC's were produced by Samsung in 1988, the KM41256A 256K x 1 bit. I realise I can't ...
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2answers
89 views

How do we model the behaviour of circuits on ultrashort time scales (< ns)?

The electric field has a finite propagation speed. How do we describe the behaviour of circuits on timescales before even changes in the electric field have reached the entire circuit? Is this is a ...
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1answer
41 views

IC to replace 4 FETs (switches)?

I have 4 data lines that I want to put to high-Z if a pin (let's call it EN_OUT) is high (or low, if necessary), otherwise connect through. I've successfully done that by putting an N-FET on each ...
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1answer
105 views

Unknown “268” DIP-14 IC

I have been going through a container of old electronics and discovered a set of ten DIP-14 ICs labelled "268." I have searched this number as well as the additional unique number on each chip, but ...
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0answers
26 views

Help identifying this IC? 0681, V04, FM279U01

Can anyone help identify it? As far as I can tell, the markings are 0681 on both sides of the die, then in the middle it has V04, and at the bottom it has FM279U01.
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32 views

LTC3111 - VIN short to GND

I'm using the LTC3111. I have followed the typical application on page 1 of datasheet. I'm operating in burst mode and no load current is drawn. When I power up the IC, the output Vout (pin 12 of MSOP ...
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1answer
65 views

How do I calculate voltage on a multi-powered DC circuit where all ends go to ground?

I'm writing software that will calculate the correct voltage on each component, given the state that the DC system is currently in (ex. what power sources are on, what relays are open, fuses popped, ...