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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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Looking to identify an old National 8-pin DIP (M8440)

I have a rail of these 8-pin DIP's that I'm guessing was bought 15 - 20 years ago. My guess is that they could be op-amps or comparators. There are 3 printed lines on these chips: N M8440 28930 35-...
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Resources for learning about transistor configurations?

I'm currently taking a circuits class that discusses various transistor amplifier configurations eventually culminating in building an op-amp. This includes various configurations such as the ...
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33 views

Pspice simulation of NE5234 op-amp internal circuit. Currently getting zero voltage gain

I'm attempting to simulate the NE5234 op-amp via internal circuits. I'm not currently getting any errors, and so the AC sweep simulation does run, but I am getting 0 V on the output nodes. I'd ...
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1answer
63 views

Will a diode change how my IC works?

If I have an IC, any IC, with a V+ and a V- that has a minimum voltage requirement of 3V to operate. Say I supply that exact 3V, but I want to add a silicon diode to the V- to prevent a reverse ...
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1answer
22 views

Using internal regulator DVDD pin to power up external devices

I am designing a H-Bridge PCB and using DRV8323 as the driver. This chip has a pin name DVDD which from my understanding, from the below statement, is used to ...
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28 views

Reusing speakers from an old laptop: how to amplify them? [on hold]

I would like to reuse two pair of speakers got from an old ASUS 1201T laptop. Since I don't know the specifications of the speakers, I looked in the datasheet of the Realtek ALC269 sound card and ...
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3answers
69 views

Control GPIO pins using USB

What is the easiest way to make a device that can control GPIO pins using USB? Can I make a device similar to this on my own without any special hardware?
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1answer
53 views

Artec QDD2 reverse voltage problem

I have an Artec QDD2 overdrive circuit and I recently powered it up with reverse voltage by accident and it doesn't give any sound on the stages of distortion, however it is allowing the bypass on ...
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1answer
33 views

Multiple Open Drain Outputs to one MCU-pin

i want to use two DRV8844 (http://www.ti.com/lit/ds/symlink/drv8844.pdf) Motor Drivers. It has an Open-Drain output, that indicates an error, when it is LOW (nFault). What happens, when i connect ...
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2answers
87 views

Why Positive-going clock transitions used in certain ICs

Why do certain ICs like 74ALS174 use an inverter so as to make a Positive-going clock transitions occur instead of Negative-going ? Why can't we just save expense of an inverter by removing it and ...
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37 views

60V 5A Buck converter for CC/CV application

I need to charge a 14S LiPo from another 14S LiPo. The easiest way would be to buy a buck-boost converter with a current limitation, but I couldn't find a single one keeping up with my specs. So I ...
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482 views

What is the chip with this PN?

I have one IC for which I can not find any clue for the part number (PN). It has "BA7P16" and "5810" on it. What manufacturer has that logo and what chip is it?
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7432 behaves like an AND gate & 7408 behaves like an OR gate

Ok. First of all, I'm an absolute beginner about IC and circuits. If you will view the pictures, you will notice that the 7432 behaves like an AND gate and the 7408 behaves like an OR gate. PS. I ...
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29 views

6 bit subtractor [closed]

So I built a 6 bit to 6 bit subtractor using 7404, 7408, 7432, and 7486 ICs on a breadboard. But my problem is I can't get the right output using the 6 pin dipswitch. I think the problem is with the ...
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1answer
67 views

Why does this datasheet show an example with an input voltage outside its recommended range?

I am using the IRS2453 which is an H bridge driver. The example is page 3 show an input voltage on Vcc of 15V. In page 6 it indicates the recommended Vcc is between Vccuv+ and Vclamp. On page 7, it ...
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39 views

4 bit to 4 bit subtractor logic gates problem

I'm trying to create a 4 bit by 4 bit subtractor here but I get wrong output. In the picture it shows that 0000-1111=10001 which should be 0000-1111=11111. Please help me. By the way the rightmost IC ...
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2answers
105 views

How would I go about converting a change in capacitance into frequency? [closed]

I have to make a model for a pressure sensor. The sensor measures the pressure by changing the capacitance. I only have the datasheet for that. Summary: pressure>> diaphragm deflection >> change in ...
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45 views

differential to single ended audio converter chip terminology

Please forgive the rudimentary nature of this question, as it is my first circuit build using IC chips. I am building an audio equalizer input card that will convert a balanced common differential ...
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1answer
35 views

Why only shared resistances are taken into consideration while computing Elmore delay?

While we compute the delay , using Elmore delay model we take into consideration the shared resistance and capacitance. I would like to know why are we only concerned with shared resistance not the ...
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1answer
38 views

Battery Protection IC in Series

I want to make a project to protect each individual cells of 16 series battery pack. I have read some data sheets of battery protection IC's such as BQ29209DRBR,S-8261,AP9281 etc. None of them clearly ...
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1answer
39 views

Identification of 6-pin chip marked W134H?

Would like to ask for help in the identification of 6-pin chip marked: W134H (it's not a clock signal generator) I think it conditions very low voltage (5mv-200mv) analog voltage inputs for a chip ...
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1answer
52 views

Non-pushbutton supervisory IC with interrupt and enable outputs, kill input and adjustable power down timer

I'm looking to build a supervisory circuit which monitors a single voltage rail. When the monitored rail goes from HIGH to LOW, the supervisory IC asserts an interrupt signal to the system MCU to ...
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2answers
56 views

Where to connect unused 555 timer ICs pins?

simulate this circuit – Schematic created using CircuitLab This question might not have a close answer since I think it heavily depends on the considered pin and IC. However, consider, for the ...
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26 views

trying to ID a component Diode with PJO489 or PJ0489 and then EXP its a power dioide on a 24vDC psu

Hello I need to Identify this component the ruler is in mm its part of a control board and goes between the 24v input and the negative cathode side of the LEDs on the control panel. The cathode side ...
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1answer
46 views

using IC in Matlab [closed]

I dont understand how to simulate circuits which contains IC's(like lt680xx or IC 555 timer).is it even possible to use them in matlab simulink?If yes, how can we do it?
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1answer
113 views

Using a zener diode to limit current to an IC for various input voltages

I'm designing a board based on TI's DRV110 solenoid driver. The datasheet explain that: "The DRV110 is able to regulate \$V_{IN}\$ voltage from a higher external supply voltage, \$V_S\$, by an ...
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100 views

Can someone tell me what this 4-pin IC could be?

Actually searching for its reference (B0929) on the internet gives me nothing. Can someone please tell what this could be?
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2answers
48 views

Integrating IC transceivers on a pcb

I have a question about the difference between transceiver modules and transceiver ICs. I want to integrate a 2.4GHz transceiver IC - nRF24L01+ onto a PCB instead of using the NRF 24l01+ module. ...
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0answers
39 views

TL064 CN issue (Phase shift oscillator)

as part of my project to construct an electrical conductivity. I have an oscillator circuit in my design. The one I chose to go for is a phase shift. in the picture you can see my circuit which Pin ...
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1answer
48 views

How to replace push buttons on an intercom?

This is the intercom panel in my apartment, it's 30+ years old and I want to give it a face lift. The push-buttons are momentary, and I want to replace them using modern ones like these, but I'm not ...
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1answer
90 views

What is the brand of this mystery chip?

I found this chip in the FCC filings for a pair of headphones that I have. I'm not planning any serious reverse engineering project here, but I am curious what brand this chip is (I assume getting ...
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28 views

How to detect source presence using LTC4412?

I'm using 2 power sources as shown in below picture. The status pin is suggested to pull HIGH to VCC(which can be the adapter input). As mentioned that Status pin OUTPUT is LOW when Wall adapter ...
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2answers
66 views

How to identify the circuit has negative feedback or positive feedback?

I am having difficulty in identifying whether feedback is negative or positive (i'm not talking about feedback topology) My teacher told that there is a method in which, after deactivating ...
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1answer
32 views

STM32F405 Internal vs External Oscillator

If the frequency stability over a temperature range is not a concern in a project instead it's reliability in continuous long time operation is a more important factor then which of the two ...
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5answers
4k views

Why does a single AND gate need 60 transistors?

Looking at the datasheet for the MC74VHC1G08, under the features section, it states Chip Complexity: FETs = 62. Why does this IC need 62 transistors, while an AND ...
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1answer
24 views

Charge Measurement for Piezoelectric Sensor

I want to measure the charge displaced by a force acting on a piezoelectric sensor. The problem is I don't know the sensor so I have no idea how big the current generated by the sensor may be nor what ...
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1answer
60 views

220v to 5v AC to DC Rectifier IC [closed]

I am working on a small project where I need to convert 220v AC to 5v DC with at least 100mA current. I am currently using Hi-Link's converter to achieve the goal and it's working great. I am looking ...
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2answers
44 views

switching sensor output between two arduinos

I'm relative new to electrical engineering, so this might be a obvious question. I'm trying to allow two arduinos to communicate with one i2c sensor. One of the arduinos is deeply integrated within ...
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0answers
74 views

What is needed to convert 2 DisplayPort lanes into 4?

Essentially, I'm trying to connect a source with only two HBR2 lanes to a device that requires four HBR1 lanes. Theoretically, the bandwidth is there. But what kind of an IC would I need to accomplish ...
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2answers
50 views

On what inherent parameters does the speed of mosfet depend in a SRAM cell circuit?

I want to design 3D IC with 2 stages for a simple SRAM cell. Some of the MOSFETs will be on the top stage while some on the bottom stage. The MOSFETs on the top stage are supposed to be degraded in ...
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2answers
114 views

Drawing circuits with IC pinout diagrams [closed]

I am not sure whether this community or the tex.sx is the most appropriate for my question. I have an assignement where I am given a boolean expression and I have to implement these expressions using ...
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0answers
42 views

Can anybody identify this SiTel IC

I am trying to identify an IC in order to repair a circuit board. Here is a photo of the IC in question: For reference, the markings on it are: ...
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3answers
143 views

What does a transistor look like in the Intel 4004 microchip?

Could anyone show a picture of what the transistor looks like in the Intel 4004 microchip? There are 2300 transistors in that microchip.
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0answers
52 views

Hobby Project - Signal Frequency detector

Context: I have taken on a little side hobby project to learn by making a circuit which should be able to only go high when it sense an acoustic signal with a frequency around 40kHz. To do this I will ...
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3answers
141 views

Help understanding IC's datasheet

Apologies if this is really obvious, but I'm struggling to understand the datasheet of the FL5150MX IC. I think my confusion may stem from the integrated shunt regulator. Under the 'Recommend ...
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1answer
44 views

Possibility to change IC HCF4060BE to IC 74HC4060

I recently purchased a very old synthesizer that uses CI HCF4060BE and I want to know if it is the memso that CI 74HC4060. To help here is the CI datasheet HCF4060BE: LINK Here the dataset of the CI ...
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0answers
61 views

FT2232H USB Device not responding

I've designed a PCB which contains FT2232H for UART and SWD debugging for a microcontroller in the PCB (STM32L0). The FT2232H circuit looks like this: and the power schematic that contains the USB ...
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0answers
35 views

MB8743 IC No Datasheet found

I cannot find the 42-pin Integrated Circuit Datasheet for Japan MB8743 8335 Z23 anywhere online. Some people says that this(any) web has the Datasheet I'm looking for and ended up saying I need to ...
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1answer
58 views

Do BJT (Darlington) transistors have a minimum collector current?

I am using a TIP122 Darlington transistor. From the graph provided in the datasheet, I can see that the saturation voltage decreases as the collector current decreases. Since the load I am driving ...
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3answers
390 views

Modifying land patterns generated with IPC-7351B wizard

I generated a 4x4mm 0.45mm pitch QFN28 according to the Atmega328P datasheet: However, the pads on the corners (1+28, 21+22, 14+15, 7+8) are too close to each other, less than 0.2mm apart (when ...