Questions tagged [integrated-circuit]

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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Why is my IC giving abnormally small voltage outputs?

I just got some new battery holders, with 4.5V and 6V respectively. I hooked up the 4.5V holder to a SR latch IC, and while it did hold a state, the LED was abnormally dim, despite having no resistors ...
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Buffer / Line driver ; 3 state IC Working

I am just curious to understanding the working of this - Buffer IC (Part Number - 74AHC1G126) My questions : I figured out that this IC does not act as a level translator which changes the voltages ...
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What is the use of V ref pin in a differential amplifier?

What is the use of Vref in a differential amplifier? Will it keep the output below V+=5V (from 0 to 5V) or will it keep the output below reference voltage (Vref) =3V (from 0 to 3V?) What does ...
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KR512 internal circuitry

The KR512 is claimed to be equivalent to the MK5009, but it clearly isn't - the pinout is different, for a start. Does anyone know what the internal logic looks like? The thing clearly has a RC ...
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How do I get the output of this circuit?

I am trying to solve the truth table of the following circuit: A, B, and C are the inputs. I tried getting the truth table by drawing the circuit in an online circuit simulator such as falstad.com/...
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What is the voltage value measured by an 8-bit ADC chip showing a binary reading of 64? the reference voltage is 3.3V

I followed the explanation in this post. I did 3.3 V/256 = ‭‭0.01289 V . I also did 3.3 V/(256/1.5) = ‭0.01964 . And lastly, I used this formula: I just keep getting the wrong answer! Please could ...
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Fabrication process of ICs

My question simply is why ICs are made using layers? Why they have used this method specifically ?
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IC Supply Current vs Temperature at low temperature

Background I am designing a low power device where every uA counts. It has a temperature range from -25C - 35C. In the datasheet for the 74AHC1G66; 74AHCT1G66, an analog switch I'm looking at, on ...
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Problem in understanding how LM565 increases the VCO frequency

We were tinkering with an LM565 (PLL IC) in school and I noticed that despite the fact that the maximum frequency of VCO was 3.5 kHz, I was able to use the PLL up to circa 5 kHz with the free running ...
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CMOS vs BiCMOS technology nodes comparison

I am trying to make a comparison between several technology nodes. More specifically I want to compare 28nm, 40nm, 65nm CMOS and BiCMOS processes. However I cannot find papers that compare some of ...
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Micro QR-code reading solution

I've tried to repair a headset, but I cannot identify the chipset because they used something that looked like QR code but smaller (wikipedia states that it's micro QR) and I have no solution to read ...
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How to analyze a RC circuit with Integrated Chip in Parallel?

I have a voltage source of 48 V, an IC and an RC Circuit between Vcc pin of IC and voltage source. RC Circuit is there to give a slow rise of 500 ms in the supply voltage of the IC (There is another ...
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Transistor Sizing in Differential Amplifier

I apologize if this question is not in the right place. I really haven't done much transistor sizing properly. Always seems to be a "spice monkey" and I would really like to fully understand each step ...
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How to calculate Ic for a very simple NPN transistor circuit

I built a very simple circuit with an NPN (2N3904) transistor. Then, I swept Vce from 0 to 5V and plotted a Vce vs Ic graph (as shown in the picture). I heard Ic = Is*e^(Vbe/VT), where VT=0.025V, and ...
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I am designing a 7 segment display but I am finding it a little bit hard to associate them

I am new in this domain and I want to design a 7-segment display from 0 to 9 and then from A to F. I made the truth table composed of 4 inputs and 8 outputs each output for the corresponding pin of ...
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Current Conveyor CCII internal circuital realization

I have read this article about current conveyor CCII, and I have some problems about understanding its circuital realization (page 4): The article says: The feedback of opamp structure [this ...
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Would it be possible to identify the IC from this image (18507CT)?

Can someone recognise the IC from this image, or the make based on the font or naming convention used? The top reads F1823 towards the end The bottom reads 18507CT. Tried looking up these numbers on ...
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TLC59116 will not drive LEDs

Having the hardest time with this TLC59116 LED Driver IC from Texas Instruments. I have done a crazy amount of debugging and still cannot get it to drive a single LED. I have followed all the ...
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Lead/Ball Finish on TI parts

I will be using the TMP117 in a design I'm working on, and was a bit curious to what the difference is between the different Lead/Ball finishes listed in the datasheet? There's a choice between ...
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50 views

Modify generic chinese LED driver circuit

I have a lot of LED flashlights and lanterns from China that use a simple IC as their driver to get these different light modes. For instance I have this small keyfob lamp that lights in the following ...
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Research for an optimal IC to interface USB to MicroSD Card [closed]

I'm looking for an Integrated Circuit from the USB Controller category, for my MP3 project. I'm looking for an IC running on 3.3V, which supports USB 2.0, which also supports SPI protocols and if ...
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27 views

Calculating power consumption of a digital temperature sensor

I want to calculate how much power does the TMP101 (https://media.ncd.io/sites/2/20170721134403/tmp101.pdf) consumes when it's operating. In the datasheet states the quiescent current in 3 cases: ...
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85 views

Is it dangerous to connect an IC output directly to GND?

Is it dangerous to connect an IC output directly to GND while there is a risk this output can be high? BUF1 is the 74LVC2G125DC dual buffer. datasheet here. But my question could also apply more ...
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Uses of ICs outputing 1 value only

There are some integrated circuits which output only digital value 0 or 1 regardless of the input for example: simulate this circuit – Schematic created using CircuitLab This outputs 1 ...
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Information on IC with markings CT1668 HDB1144

The IC looks similar to this; I found it on Google when searched for CT1668 HDA1144 I don't even get the manufacturer name right; is it HEAD? Can anyone share its ...
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Naming convention and list of ICs

There are some parts that use the same part number across different vendors. e.g.: 23cxx: SPI SRAM (only Microchip?) 24cxx: I2C EEPROM 25cxx: SPI EEPROM 27cxx: parallel EPROM (UV light erease) 28cxx: ...
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74ls279 SR latch not working

I am trying to get an 74ls279 SR latch to hold a state, but it's not working. I am using a full-size solderless breadboard, a 3V power supply, and an LED to view its state. The LED flickers and loses ...
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55 views

50 ohm terminated PCB traces

I have designed an IC which I wish to test. I had a company design a PCB form me with all the traces terminated with 50 ohms and connected to headers. The inputs to these headers will be provided ...
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1answer
36 views

Help identify Integrated Circuit

I can't find information for the IC in the picture. It's a socketed 8 pin DIP that is part of the controller of a CNC machine. As far as I can see it receives signals from a microcontroller and then ...
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Which kind of IC is it [duplicate]

Does anyone know which kind of IC is it? Is it used to determine whether the key is open or not. Becuse the side of key high voltage RF is exist, transformer is used as a isolator. When the key is ...
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91 views

Is integrated circuit packaging copyrighted/patented? [closed]

A friend of mine is interested in manufacturing ICs. He wants to know whether the different form types of packages (DIP, LGA, BGA) have intellectual property obstacles to using them. If so, who owns ...
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75 views

Two way diode IC?

I'm building a diode network similar to this: I'm trying to make the footprint of this circuit as small as possible. In the circuit above, there are 5 "pads" - the top horizontal surfaces. The design ...
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41 views

Through hole buck-boost ic [closed]

I'm looking to create my own buck-boost converter but want to test it on a breadboard. I have done online searches but only surface mounted ICs show up. The Texas instruments TPS63061 looks ideal for ...
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118 views

What is the function of Zener diodes in an astable multivibrator?

I came across this schematic in my textbook which has back to back Zener diodes connected to the output of an astable multivibrator using op-amp which apparently varies the peak to peak output ...
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1answer
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Sizing transistors (W/L) for an IC Operational Amplifier

I have to design a simple operational amplifier in a similar way to what has been shown to me in a lesson at my university course: I have some basic doubts about how to size the transistors (W/L) and ...
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26 views

Cascode current mirror output dynamic range

let's consider this cascode current mirror (Microelectronic Circuits, by Sedra Smith): The books says its best advantage is the high output resistances, which is amplified by the presence of Q3. ...
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1answer
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10-pin IC with SMD code MMAB GA9

Please help me to identify this 10-pin SMD IC with top marking MMAB GA9. On the back side there is no code. My search on several SMD Code Web sites was unfortunately not successful. The slide gauge ...
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1answer
94 views

How do I properly level convert between microcontroller and 3.3V SPI pins

I am trying to create a PCB that interfaces a type K thermocouple with a microcontroller (STM32F303K8) using kicad 5.0.0 I previously sent the PCB to JLCPCB for fabrication, but now i'm noticing ...
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When do I include parasitic capacitances in a VLSI analysis?

Each transistor in a current mirror I’m designing has internal capacitance (C_gs, C_gd, C_ds). Im trying to do an analysis by hand to find the transfer function, but I dont want to include all of the ...
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How does doping concentration affect MOSFET switching speed?

I've read that increasing the doping concentration would cause the carrier mobility to decrease, but at the same time, it would lower the threshold voltage. So a few questions come to mind: When we'...
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90 views

Can I use an ADC pin as AREF?

simulate this circuit – Schematic created using CircuitLab I'm using the A9 module from Ai-Thinker in a logger project. It has 2 ADC pins and I need to measure 2 analog inputs (not at the same ...
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1answer
39 views

Design of Fully Differential OTA Circuits

This is the equivalent model of an ideal single-ended OTA: Now, this is the equivalent model of an ideal fully differential OTA: Now, is there a rule for getting a certain circuit with a fully ...
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37 views

Effect of Source and Load Resistances on a Filter

suppose I want to design a low pass filter (for instance a Chebyshev filter) by using the low pass prototype method: The upper circuit is the Low pass prototype filter, while the lower one is the ...
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Make siren with UM3561 louder

I have a UM3561. With the circuit below I could achieve 95dB sound. I would like to increase sound level to 100dB. What changes must be made to the UM3561 circuit to meet the sound level ...
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HP 1740 monitor stay on 2-3 seconds, turn off and repeat

I have an HP 1740 monitor that, when I turn it on, just remains 2-3 seconds to display and turns off completely (even the pilot). It seems to me that the problem is not in the backlight. I opened the ...
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ft24c02a EEPROM Raspberry Pi I2C issues reading

I have a digital scale that I am trying to take apart and feed the weight into a raspberry Pi. The digital scale has a FT24C02A EEPROM that is I2C enabled. I am guessing that the weight is calculated ...
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OpAmp with inputs connected together

So I was taking a look at some of the example schematics in Eagle and I came upon this weird OpAmp configuration in which both inputs are connected: I'm not sure what this is meant to do, my best ...
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91 views

Toggle 555 timer IC both with switch and arduino

I want to use 555 timer IC (NE55P) as a latching toggle switch. I successfully did it using a switch as described in this toggle 555 schematics except, I am using 5V power with led as output ...
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98 views

How to switch on/off ungrounded circuits using a transistor

I want to switch on/off the shown parts of a circuit using a transistor, which will controlled by an Arduino, please see the picture below - the yellow marked ones. The circuit is build around a ...
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Controlling cardreader numpad input with microcontroller

I am trying to automatically input a pin code into an electronic card reader so I can automate the process. First thought was to build a small robot finger and control that to input the code, ...

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