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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63 views

Looking for 4 bit memory option

I'm building a small and simple 4-bit CPU and I'm looking for an IC to store the program opcodes. I've considered using eeproms although they seem too large for my purpose, being in the kilobyte ...
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38 views

What are my options for dual 4-input OR gates using the 74LS00 series ICs?

I have designed an ALU (Arithmetic Logic Unit) using Logisim and it's working quite well. In my design, I use a few 4-input OR gates. After reviewing this list of 7400 series ICs, I've come to the ...
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0answers
19 views

Issues With 74HC299 Register - Not outputting data after loading it

I am using a 74HC299 as an 8-Bit register in a project of mine. I am not using any serial circuits, it is just parallel input and output. I have it set up so that the master reset is hardwired to ...
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2answers
200 views

Cascading several SPI devices

Is it possible to cascade several different ICs on the same data line, in order to use less CS pins, by tying the digital output of each to the digital input of the next? I am familiar with this ...
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1answer
270 views

Weakest link in lifetime of electronic circuits

I'm working on a product, a single-board computer with an expected lifetime of 10-15 years, and I'm trying to identify the correct components to focus on for this. So far electrolytic capacitors ...
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3answers
140 views

What exactly is a microcontroller?

Can an optical mouse sensor chip (System On Chip) which has a digital signal processor, Serial I/O, and a set of registers be considered as a Micro-controller?
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2answers
65 views

Fan in Fan out problem

Fan out is the maximum number of inputs that can be connected to a specific output. Why can’t we connect more number of inputs to this output?
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4answers
1k views

Why do some people use resistors to create a HIGH connection on a chip?

This is a follow-up question to my previous one, What does Low/High mean on the connections of a chip?. To create a HIGH connection, you often just connect the pin to VDD, which is often above VIH ...
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1answer
75 views

What is difference? The name of IC's are punched or printed or stickered on top of it

I've seen in some IC's the name of it is 'printed' on the top side. But in some IC's the names are 'punched',they have impressions on the IC. And in some cases, a 'Sticker or a Label' has been ...
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2answers
164 views

Dimensions of TQFN-EP 48 lead package

I'm looking for the correct pcb footprint for the MAX1979 IC by Maxim, supposedly in a TQFN-EP package. While the land patterns are available on Maxim's website, there are apparently several 48 lead ...
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1answer
71 views

melting ic epoxy casing

I was attempting to remove solder with faulty solder braid (there was no flux in the section I was using (for some reason...)), and I kept the soldering Iron on it for far longer healthy. Now the ...
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1answer
44 views

Modifying a chip on a bought voltage measurer

I have bought a battery checker for my RC LiPo battery packs. The battery checker can measure and alarm at low voltages between 2.7 and 3.8 volts, however with LiPo batteries, the interesting range is ...
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1answer
94 views

AN7149N -based power amp usage

I have assembled AN7149N-based power amplifier according to the datasheet, but it shows no signs of life. The only changes I made were 2,7 ohm resistor instead on 2,2 ohm one, and 1000uF capacitor ...
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11answers
5k views

Why do we need so many transistors?

Transistors serve multiple purposes in an electrical circuit, i.e switches, to amplify electronic signals, allowing you to control current etc... However, I recently read about Moore's law, among ...
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4answers
302 views

Duplicate pins on an IC

I've realised that several ICs with simple components, such as the FDS6690, provide duplicate pins in order to comply with a standard IC package (e.g. SOT23). My question is - are these pins connected ...
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2answers
89 views

Possible to use 7447 to drive common-cathode 7 segment display?

I know that the 74(LS)47 is designed to drive common-anode displays. However, is it possible to make it drive a common-cathode display? What is the simplest (in terms of components) way of doing this? ...
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2answers
61 views

RAM/Latch Type IC

I was looking to find an IC (particularly in the 7400 series) that could act as a very simple RAM device, like a flip-flop or something. I came across 74hc373, but I'm not sure this is what I'm ...
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1answer
54 views

USB port suppressor

I am using SN65240PWG4 USB PORT SUPPRESSOR. This is a part of the schematic: (I have connected pins A (6) and B (8) to D- and D+ USB pins. C and D I must connect to the supply) In this schematic ...
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3answers
328 views

Power supply with LM723

I'm trying to troubleshoot a delinquent power supply I have. Most recently one of the transistors (Q1) actually exploded on it. This has led me into investigating the schematic, but try as I might, I ...
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2answers
61 views

Dynamic Logic - Transistor Sizing

If we have a circuit in dynamic logic: What should the size of the charge transistors (Qe and Qp) be? I know that increasing the size improves the speed but also increases the dissipation, and that ...
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2answers
115 views

How to make a color-changing LED circuit that runs off of a coin cell

I've been curious for quite some time about the 2-lead RGB color-cycling LED's. I know that they have 3 tiny LED's inside and an IC, but I'm really curious to understand what's going on in the IC that ...
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1answer
35 views

Measruement of RF Signal strength / phase difference

I would like to measure the signal relative strength and phase difference of two bluetooth(BT) receivers. and I found a chip that will do exactly that, AD8302 ...
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2answers
58 views

Difference between 7446,47 etc

I have looked in the data sheets, as well as the TI article, but I am still unsure of the answer to this question: What is the practical difference between a 7446 ("BCD to 7 segment decoder/driver ...
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3answers
121 views

DC-DC step up from 3V to over 100V

I'm currently building a DC-DC step up circuit to step up 3V to 100V. I don't want to use transformer because i want to keep the circuit as small as possible. My thought is ... building a 30V-output ...
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4answers
316 views

Will the schematic I created for my project work?

Edit: I made it and it works like a charm :D . Only had to connect the switch -ve to the -ve lane and the switch +ve to the +ve lane (not shown in schematic!!) and the circuit works like a chram. I ...
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1answer
37 views

How do I reverse this following circuit, i.e. when the laser is off then it should stop buzzing?

All the necessary symbols are given in the circuit itself. When the laser is shooted to photoresistor, then buzzer stops. I want to stop the buzzer as soon as laser gets off.
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3answers
144 views

Noobie at IC, need help with basic circuit that isn't returning correct values

Okay, first of, I'm a complete newbie at ICs and circuits and I'm doing this for a school project. I request answers to be in laymans terms and not proper, complicated terms. For my first ...
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2answers
130 views

How can I add three AC signals?

I have three light sensors which outputs appropriate AC currents with respect to light intensities. I only have one pin left for my ADC IC that I have on my board so I can't sample three sensors using ...
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1answer
41 views

Determine the output voltage of an integrated ciruit

I'm planning to use an HPA674A (bq25504 EVM) which is based on the bq25504 IC to connect a device (wsn) that works from 2-3.6V which is connected to the Vstor pin and the storage element is connected ...
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2answers
124 views

Boost converter 100mV to 5V

I am trying to design a boost converter which converts 100mV to 5V. 100mV is the minimum I get from my DC motor which I used as a generator and max is around 1V. I tried searching for the IC's which ...
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3answers
122 views

Lower power version of ULN2803?

I want to drive around 80 LEDs from an Arduino with 10 8-bit shift registers. (Some will be RGB LEDs; I count those as 3.) I know of the TPIC6B595 high power shift register but it's expensive: 1.75 ...
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2answers
86 views

7-segment display driver IC [closed]

Which IC can I use to control 7-segment display? I want to make simple projects like a reaction timer but I don't have an Arduino or some other microcontroller available. What ICs can I use instead?
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3answers
165 views

What are the failure mechanisms in an integrated circuit?

Context I've always tried to design my circuits for chips to be well within their absolute maximum ratings. However understanding the failure mechanisms is vital to be able to debug a chip when ...
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2answers
68 views

Is it necessary to connect all power pins to power pic16f877a [duplicate]

I am using a pic16f877a for a project and I noticed that there are two VDD and VSS pins. I wanted to know weather all 4 pins had to be connected to power or just one VDD and one VSS pin. A circuit I ...
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3answers
505 views

PCB fabrication vs PCB assembly

What is the difference between PCB fabrication and assembly? Some companies like Golden Phoenix list that based on the size of PCB, it outputs a quote. Mine was 2.1 x 1.6 inch. It outputted 29 pieces ...
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1answer
60 views

Prevent Clipping and Hum in class d amplifier [closed]

I got this amp. Now at large volumes, there seems to be clipping. How can I prevent it from happening, rather than never playing at high vol. Can it be done by AGC or Dynamic Range Compression or ...
2
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1answer
91 views

SN7400N unusally high propagation delay

For a small lab project I was asked to measure the propagation delay of a SN7400N NAND-Gate. In order to do this i connected one input pin to 5V and the other one to a clock running at 1 kHz. I ...
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3answers
186 views

IC - Case temperature vs Operating tempaerture

When datasheets lists(MAX9744) that the normal operating temp are b/w -40 c to 85 c but the case temp should not be up above 165 c what are they suggesting. How come an IC work if its case temp gets ...
2
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1answer
42 views

What does Low/High mean on the connections of a chip?

This is similar to this question, but that seems to apply more towards programming microcontrollers rather than directly setting hardware-controlled chips. I have a PCM5102A, and the datasheet tells ...
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1answer
65 views

Is there a version of the 74HC154 with active High rather than active Low?

I'm looking for a 4-to-16 decoder IC, but I'm looking for an active High similar to the 3-to-8 decoder M74HC238. Seems all the ones I'm finding are active High.
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1answer
68 views

Hacking Brookstone rover LEDs

I have a Brookstone rover 1.0. In the app, you can trigger an IR LED to go on. I have also installed lights in the front and back of the rover in a simple LED series driven by a resistor connected ...
2
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1answer
123 views

What is the difference between an I/MM, E/MM and H/MM package?

I'm looking into the PIC18F25K80 as a new microcontroller for my company, but ran into an issue with supplier quantities. The PIC18F25K80-I/MM-ND that I originally selected seems to be very hard to ...
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2answers
144 views

Do any commercially available generic circuits use only discrete components? [closed]

I'm currently toying with embarking upon a totally crazy hobby project, which would prohibit the use of any component that cannot be 100% verified manually: obviously this completely rules out all ...
9
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1answer
372 views

How does soldering affect the internal bonding between the IC die and its package?

In other words, How does the IC fabricator solder these thin wires between the die and the pads and guarantee that the soldering iron temp (300C for example) on the IC pads won't desolder them?
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1answer
50 views

Diode built-in voltage and barrier voltage (forward bias voltage) are they almost equal? how do they relate to each other?

I am little confused between the built in potential that is built up in the diode depletion region and the barrier voltage that needs to be applied across the PN junction to start conducting. My ...
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2answers
99 views

Any option to upgrade library in tinycad?

I used tinycad to draw circuit schematics for my project. But CD 4017 IC was not there in its library. Is there is any possibility to upgrade tinycad library?
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248 views

What is a Schmitt Trigger and its application exactly?

i would like to ask about what is a Schmitt Trigger and about its application. I searched a lot but still didn't understand it. Please explain step by step and hope you help me in its applications ...
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1answer
64 views

Value of C in the RC Circuit

So my homework question is: Estimate the value of C needed in the RC circuit below if it is to act as an integrator for frequencies above 10 kHz. I've been stuck on this question for a while. At ...
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2answers
154 views

Reverse engineer: How do I remove the black plastic that hides the ics?

I am hacking a circuit and it has this black plastic thing (see picture below) that hides part of the circuit. How can I remove them to see what is inside? What they are for? I think they are for ...
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0answers
48 views

Integrated Circuit Multiplier Circuit Problem

I'm developing an 8bit x 8bit IC signed multiplier using FULL adder cells. Once I get partial products, I add them together. The problem I have occurs in this stage, adding of the products. This is ...