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.

learn more… | top users | synonyms (2)

1
vote
1answer
44 views

LM2907 schematic critique

I have been working with the LM2907 as I have been designing a few circuits around it. This has lead to me wanting to understand more of its inner workings and build up a breadboard model of the ...
2
votes
3answers
248 views

what is quadruple in IC gates

What is quadruple in integrated circuit gates? Is it just about 4 gates inside the IC or anything else more special?
1
vote
1answer
91 views

Needing help with chip identification: Hard mode

I'm decently skilled with basic ic identification methods and lot number cross reference identification for the rebadged chips, but I've ran into a chip I just cannot identify. On the same board there ...
0
votes
1answer
25 views

Help Identifying Touch Controller Chip

My oven started displaying an error code E11 that indicates a "shorted key". These chips are on the back of the oven touch panel. They don't seem to be the Atmel chips. The marking on the SOT23-6 ...
0
votes
1answer
61 views

comparator problem

where is the mistake in my circuit? i attempted to create simple continuity tester, image really explains it pretty much. IC - ne5532p PS: i know reference voltages on two op amp (+) terminals are ...
0
votes
1answer
68 views

How can I fix this ESC circuit?

What happened: Two of the blue wires touched while an 11.1v battery was hooked up and POP What's in the photo: Yellow is the heat shrink wrapper I cut open the material with square impressions on ...
-1
votes
2answers
52 views

MCP3008 alternative

I have some analog devices like LDR, temperature sensors, and other sensors and I want to use the readings of these sensors in my raspberry pi B+ , for that I need an ADC , to convert the analog ...
0
votes
1answer
69 views

Question about MCU's, and Audio Manipulation

Ok, so I've been doing some research trying to find something like an audio MCU\DSP with a built in audio filter; for instance, something that I could manipulate audio with to get a final filtered ...
0
votes
1answer
89 views

How to step down 12v to 5v efficiently

So, I have a wall-wart power supply giving regulated 12v 500mA to a 2.1mm Jack. I'm using this to power a 12v 160mA fan, and an Arduino Pro Mini (at 5V). I understand that the Mini's regulators to ...
0
votes
0answers
21 views

Modifying a Boss DS-1 Distortion pedal, possible lifted pads

My apologies if this is in the wrong place, seems like the people on this section would know what to do in this situation. I am brand new to circuit bending and electronics work in general, really ...
0
votes
3answers
88 views

Working with a tiny IC

I have recently purchased several Atmel's touch sensor IC's AT42QT1010 which are extremely tiny (1.6mm x 2.9mm) and I would like to be able to mount them on a breadboard. I have tried soldering them ...
0
votes
1answer
40 views

IC for Trickle Charging vs. Fast Charging a NiMH rechargeable battery using solar and wall charger?

I want to use a solar panel to extend the use time of 3 NiMH AA's in series to power a microcontroller. The solar panel is rated at 1 W with a max load voltage of 6.4 V and the product page is here. ...
0
votes
0answers
52 views

Reverse engineering MOSFET power circuit

I'm looking at a portable heater circuit that uses a 1.4 Ohm resistive load as the heating element. The circuit in question uses an N-channel dual output mosfet, and on the other side of the board a ...
0
votes
1answer
57 views

static Hazard and challenging questions

i read some notes that wrote: for following Function F, has static Hazard, if B=C=D=1, and for each change in value of A, the Static Hazard 1 can be. Why this statement is True?
0
votes
0answers
16 views

Development environment for csr8670

I am trying to develop firmware for csr8670 chip, have searched a lot, found only BlueLab to use as development environment but it is not useful for me. If anyone here may have experience with csr8670 ...
0
votes
1answer
21 views

battery monitor circuit modification

A 12V battery monitor circuit is available on this page. What can be done to modify that circuit to alarm when voltage goes below 15V ? ...
-1
votes
1answer
99 views

Why inductors can not be integrated into IC? [duplicate]

If passive components like resistor and capacitor can be integrated into an IC, why not inductor?
0
votes
1answer
35 views

Easy circuit for “nested” triggering

I need a trigger circuit that gives several high pulses for an "out_0". After 5-6 pulses from out_0, it then gives one high pulse for an "out_1". I don't need any circuit that's large or has high ...
0
votes
0answers
48 views

how to redesign the circuit to drive a 230V 100W lamp for 5 minutes

I have a circuit , the circuit operates with a siren using a 9v battery the siren used is UM3561 i want to replace the alarm part of the circuit using a RELAy that can drive a 100W 230V lamp for 5 ...
0
votes
1answer
63 views

Li-Ion charging ic with 5V input and battery voltage between 3.9V and 3.6V [closed]

I am currently in search for a battery charging ic that has a variable output voltage (so that I can set it to 3.6V to 3.9V) or a fixed range, similar to what I would like to have. But why would I ...
14
votes
4answers
2k views

Are solder bridges on chips always bad?

I just bought my Arduino Ethernet shield – a knock-off one for $10 instead of $60. I connected it up, but it doesn’t work – LEDs light up but do not blink, and no ethernet link is established ...
1
vote
1answer
70 views

Unpowered MAX232 - input 'leaking' into Vcc

My PC is connected to a MAX232 through a USB-to-serial cable. When everything is powered, there are no issues. However, when I turn off the power, the MAX232's \$V_{cc}\$ has a voltage of -0.5 V ...
0
votes
1answer
64 views

HX711 amplifier

I have one of the HX711 ADC devices that I want to use for a weighing application. I've fitted it to a breadboard and used demo firmware to poll the chip for readings. The behaviour is as follows: The ...
0
votes
1answer
47 views

Identify flash IC by ID

I read flash device ID as following: Manufacturer: c8 Device: 4013 Is this enough information in order to uniquely identify the IC? Is there some web repository ...
1
vote
1answer
62 views

Attempting to use ATMEGA on its own

Short Version: I've wired up an ATMEGA328 chip standalone, after programming with arduino. By itself, the chip is not functioning properly, but when the arduino (with exact same chip) is wired in, it ...
0
votes
2answers
97 views

Difference between NE555 and NE555xx

I'm going to order the NE555 chip from Texas Instruments (Link) to build a circuit, but they only have NE555P, NE555DR etc. Can I use the NE555xx instead of NE555? What is the difference between them? ...
2
votes
3answers
72 views

Control 3.3V IC using Arduino?

I'm working with an IC that can't take more than 3.3V (+/- 0.2V), including on its I/O pins. I want to control it using Arduino, but its PIN's are 5V. Now I'm wondering if I can use PWM to archieve ...
1
vote
0answers
74 views

Which semiconductor manufacturer names parts RTCxxx

I am in the process of reverse engineering/tearing down a small Bluetooth speaker. In the audio path, there are two amplifiers. Their top markings are RTC002 and RTC005. Note that these are NOT ...
0
votes
1answer
50 views

8051 micro controller on chip ROM address range? MEMORY SIZE

what is the size for each of these chip ? I know that when we add 1 bit to the memory we double the size. my question is what is the size for a chip range from (0FFF - 0000) so that i keep doubling ...
0
votes
1answer
34 views

Help identify ic marked 85616 HSS8444 3

I have a small collection of these as well as a few other unidentified items. DIP-16 pkg. Top markings; 85616 HSS8444 3 Bottom markings; 1720 90W
1
vote
0answers
62 views

Faster PIR Sensor speeds?

I am trying to use an array of sensors to trigger a series of stepper motors based on peoples' presence within different areas of a hallway. It is for an interactive kinetic art piece at an elementary ...
3
votes
2answers
139 views

Should I use a current limiting resistor for pins labeled as NC which should not be left floating?

Playing around with the 23LC512-I/P SPI SRAM chip from Microchip, I found something strange in the datasheet (http://www.microchip.com/mymicrochip/filehandler.aspx?ddocname=en559704); on page 13, ...
0
votes
0answers
19 views

selection of p substrate as wafer in cmos process flow

In a typical cmos process for ic fabrication why do we always start with p substrate? why not with n substrate?
5
votes
2answers
486 views

3D stacked ICs; why are they not common yet

I have heard/read in the past that people are not looking at constructing integrated circuits as stacks of individual dies, connected together inside a package. This has been done for example where a ...
0
votes
3answers
71 views

Chip Holder for LM8560

I am building a digital alarm clock, and I need a chip holder for the LM8560 chip. I tried a sop 30 to dip 30 holder. The chip fits on width but not length. The chip is to long and even if I used sop ...
0
votes
1answer
70 views

Any help identifying these parts and their purpose

Short: I'd like a manufacturer identified. Long; I've been tearing apart old electronics and looking at them to see how they work and getting caps, op amps, transistors, small logic circuits and the ...
2
votes
1answer
73 views

How to determine IC function

I have a lab assignment coming up in which my instructor is tasking us to determine the function - essentially construct a truth table - of several unknown integrated circuits of varying difficulty. ...
1
vote
2answers
122 views

What chips do 3$ wifi dongles use? [closed]

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 ...
0
votes
1answer
42 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 ...
0
votes
0answers
47 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 ...
0
votes
2answers
40 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 ? ...
0
votes
1answer
47 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: ...
0
votes
4answers
195 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 ...
0
votes
0answers
44 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 ...
1
vote
2answers
39 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 ...
0
votes
0answers
69 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 ...
0
votes
2answers
104 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 ...
0
votes
0answers
37 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, ...
0
votes
3answers
91 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 ...
0
votes
2answers
111 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 ...