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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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 ...
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3answers
83 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 ...
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19 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. ...
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47 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 ...
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1answer
52 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?
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31 views

It's possible to update set top box receiver IR hex code(remote) via USB or any method [on hold]

I wanna to know about SET TOP BOX(satellite tv receiver) IR codes where itz saved in set top box and it can be updatable by USB port or download by satellite dish download linking. And the HEX ...
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0answers
13 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 ...
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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 ? ...
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1answer
96 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?
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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 ...
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0answers
44 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 ...
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1answer
61 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 ...
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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 ...
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1answer
67 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 ...
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1answer
52 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 ...
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1answer
43 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 ...
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1answer
60 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 ...
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2answers
95 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? ...
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3answers
69 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 ...
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0answers
72 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 ...
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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 ...
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1answer
33 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
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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 ...
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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, ...
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0answers
18 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?
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2answers
484 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 ...
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3answers
70 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 ...
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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 ...
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1answer
71 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. ...
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2answers
121 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 ...
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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 ...
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0answers
46 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 ...
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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 ? ...
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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: ...
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4answers
192 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 ...
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0answers
39 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 ...
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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 ...
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0answers
62 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 ...
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2answers
100 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 ...
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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, ...
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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
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1answer
89 views

Identifying 6 pin SMD package [closed]

I need some help identifying this SMD component. it says k1(maybe k1: ), and has 6 pins. It was found on laptop's motherboard (Asus g73).
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2answers
108 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 ...
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2answers
62 views

is there any analog voltage reading ic present? [closed]

In arduino analogRead() reads voltage from 0 to 5 v and gives 10 bit output. Is there any IC which is specialized for this function only?
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1answer
53 views

How to generate bar using decoder

Ic74154 decoder generate active low o/p i.e for example if input is binary 5 , 4 becomes low. I want a circuit which will give output when i/p is binary 5 then o/p is low for 0 to 4.It is possible by ...
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1answer
70 views

Subwoofer Amplifier Circuit [closed]

I've had asked many sites but they don't leave any answers. I want to build a subwoofer only without using a crossover and I want to know what should I include in the power amplifier circuit. Can ...
1
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1answer
52 views

Question about a dimension in this IC package drawing

this is the first time I'm making a PCB layout, so I'm not too familiar with datasheets. The picture below shows a diagram for an IC I'm using. The datasheet says all dimensions are in mm. However, ...
2
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0answers
54 views

Where to find ICs in package sizes good for soldering? [closed]

I'd like to know the best places to find ICs that you can solder with. A lot of the package sizes I come across are way too small to solder by hand. I prefer through hole and sockets (like pdip), but ...
3
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2answers
220 views

Do I have to power-on reset CMOS counters?

I am designing a project that contains several CMOS counter ICs (CD4017 specifically). What is the state of the counter on power-on? Do I have to incorporate circuitry that pulls the reset pin high ...
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2answers
123 views

Negative voltages in the real world?

I was given the task to design a circuit that has a 5V input and uses a differential op amp to provide an output that oscillates between 5V and -5V. The design I came up with is the following: ...