1
vote
2answers
69 views

What parts can I use to make 110V DC from 4 D-size alkaline or NiMH batteries?

I need help with choosing DC/DC converter parts. I want to build D-size battery powered lantern working with typical E14 or E27 compact fluorescent lamps. Here is my awesome idea :) It will be ...
0
votes
1answer
56 views

Help to identify part

I'm trying to repair a broken baby monitor and found an interesting looking part. It looks like an thermocouple but I'm not sure. Do you have any ideas? See board picture.
2
votes
1answer
71 views

Product Price Question

At our company, we are in the process of finishing to develop a toy prototype. I need to estimate the "production" price of all the components. I was able to gather all the price from every ...
0
votes
1answer
19 views

LTspice: How to convert .asc file to netlist?

Using LTspice I can create .asc files which contain the information about my circuit. Is there a way to convert this information to a netlist? I am looking for a ...
3
votes
0answers
120 views

How do filament LED bulbs work, looking very similar to incandescent bulbs?

Filament LED bulbs use very narrow strips containing the LED, which look similar to filaments of an old incandescent bulb. Here's a good picture: http://www.aruana-led.de/ They look like a normal ...
0
votes
1answer
50 views

interface component for screwing to make electric contact

Is there a component that allows you to stack two PCB on top of each other and screw them together to make electric contact? Thanks!
4
votes
4answers
759 views

What is the name of this “plastic wire loop”?

Someone told me that it is called wire loop. I want to buy it, but I could not find it using wire loop as keyword
0
votes
1answer
67 views

Code on capacitors

I accidentally let the magic smoke out of two (tantalum?) capacitors, one on an Arduino-based board and one on an RF reciever. Apparently they don't like being hooked up backwards. :-) For the ...
2
votes
2answers
258 views

What is this component (probably a shock/vibration sensor)?

The other day I received a promotional wrist band from a convention booth -- it has two LEDs that flash when you jostle it. I removed the guts to see how it works, and here is what I found: Most of ...
1
vote
1answer
54 views

What type of transformer is this?

I have a design project for my electrical engineering class where I'm designing a signal tracer akin to Tripplett's Fox and Hound series. For a reference, I tested the output of a commercial tone ...
0
votes
1answer
55 views

Can current flow in one circuit complete another circuit?

I have two circuits C1 and C2. The power supply for C1 is much lower-powered than the power supply for C2. How can I have C1 switch on C2? I'm fairly new to circuitry, but I imagine I'm looking for a ...
0
votes
2answers
76 views

1N34 / 1N270 obsolete

When I search for 1N34 on Mouser I get nothing, and when I search for 1N270 diode I only find a note that it is obsolete. What is now used in place of this part?
1
vote
3answers
59 views

Inductor specifications for AM circuits

I am working with the book "Build Your Own Transistor Radios" by Ronald Quan in which he has a lot of AM projects. I am having a hard time figuring out what I need to buy from his specifications. For ...
0
votes
0answers
43 views

Finding/figuring out pin configuration on undocumented components

I recently purchased an assorted set of LCD/LED displays, and inside there were a set of components which I cannot find a datasheet for upon googling the component number. For instance in the ...
-4
votes
1answer
55 views

How to extract the motor that spins at a very high speed in a dvd drive? [closed]

According to this, this and this, I gather that there must be a motor inside a CD/DVD Reader/Writer which makes the CD/DVD spin at a very high speed. I have two old working drives and I want that ...
7
votes
4answers
1k views

What is this component in the picture?

I am building a "DIY Cellphone" project (http://2loo.com/ax). I have ordered all the components in the Bill Of Materials (http://2loo.com/ay). I put together almost everything when I stumbled upon a ...
1
vote
1answer
183 views

What components are these?

I usually buy electronics components at an online surplus store and they usually throw in the box some more goodies to pack what you order. I bought a multi section plastic contanier and it was ...
1
vote
3answers
127 views

Electronics Schematics Reading [closed]

I'm an electrical engineering student in college and am very confused about some things in electronics. I have a pretty good idea of how basic electronics components work but im have trouble with ...
0
votes
1answer
49 views

How do I replace a CdS sensor in a circuit with an ALS replacement?

I am wanting to replace a resistor in a 555 circuit with a light sensor, but don't want to use the traditional CdS cell. I'd like to use an ALS such as the Everlight ALS-PDT144-6C/L451. This is the ...
0
votes
2answers
83 views

Programming with ARM without microcontroller context [closed]

I want to make an application that will use ARM CPU. Am I bound to using microcontrollers? The thing is the microcontrollers that have ARM as a base are really big in physical size. Can I create a ...
7
votes
3answers
546 views

What is this tube thing? (Madcatz drum pedal)

Could someone help me out, I have no idea what this tube-like thing is. This is from a Madcatz Xbox360 drum kit pedal. The pedal stopped working and I opened the it up and found just this tube thing ...
2
votes
3answers
106 views

How to find info on part efficiently?

I'm not exactly a novice to electronics, but my problem is closely related, and I still feel like a complete newbie at those times. I have no problem sourcing parts for new projects. Part of that is ...
1
vote
1answer
61 views

How to break components in SPICE?

I've been learning SPICE over the past few days, using the LTSPICE program. One thing that just escapes me, is how exactly do we know when a component's absolute maximum ratings have been exceeded? ...
-3
votes
2answers
77 views

Effects of a subwoofer on computer components [closed]

Ok so here's a question that I've only seen asked once, what are (if any) the adverse effects of having a subwoofer included in a PC case mod? The Backstory: I've got an OK case. Looks nice, has cool ...
1
vote
2answers
81 views

Advantages of Isolated DC-DC Converter over non-isolated?

I am trying to understand in what type of situation I will need an isolated DC-DC converter instead of a non-isolated one. What are the design criteria that can lead one to one way or another? In my ...
-1
votes
2answers
68 views

Maximum temperatures electronic components can withstand in low pressure molding

Maybe someone has experience in this field. I'd like to overmold a PCBA, which has SMT components, with a low pressure molding process. I am concerned about the temperature of the hotmelt material ...
1
vote
2answers
115 views

Power LEDs from wall outlet without transformer plug?

I want to power part of an LED strip like this one: http://www.amazon.com/Lighting-EVER-Flexible-Waterproof-Ultimate/dp/B005JR1NUU ... from a standard US wall outlet. I don't want to use a bulky ...
1
vote
1answer
115 views

Whats the name of a BMW iDrive type of encoder? [closed]

I am looking for a component that some people call a 7 way encoder switch. Basically, if you look at the center piece of the BMW iDrive, its that. It's a knob looking piece that if you turn to the ...
1
vote
2answers
118 views

What is this inductive component?

I was salvaging a printer and found like three of these components: To me they look like a solenoid, but it seems to have a switch-looking lever at the end and a round piece of metal at the end. ...
11
votes
2answers
759 views

“Remove After Washing” on Piezo Buzzer

Maybe this is a stupid question, but here goes: I just got a piezo buzzer and on the top there is a sticker that says "Remove After Washing". My question is why would I ever want to wash an ...
-2
votes
1answer
106 views

what parts are needed on my PCB for bluetooth? [closed]

Too broad. So let me try to rephrase it: I want to make a Bluetooth module. The only function I want is for it to connect to a mobile device and check battery life (but don't be concerned with the ...
2
votes
2answers
112 views

What's the name of this component (Mechanical Switch?)

I am searching for the name of this electronic component (and a place to buy it): It is some kind of mechanical switch. When nothing pushes against the platic triangle, the switch is closed. I have ...
43
votes
3answers
4k views

Why are there only four passive elements?

I've read that there are four types of passive elements: resistances, capacitors, inductors and memristors. The memristor was predicted 30 years before it was produced. But why couldn't you invent ...
-1
votes
2answers
120 views

What seven segment display do I have? [closed]

I'm having a surprisingly hard time figuring out which seven segment display I have on a board I'm looking at. It is common anode, as there is one pin tied directly to Vcc. It's like this, except ...
-2
votes
1answer
57 views

Component polarity markings [closed]

Ok, I have my capacitor 4700 mikes should more than do the trick. I have my diode, soldering iron, jumpers and leads. Then I realized its been so long since I've installed solid state components I ...
1
vote
2answers
82 views

How can I maintain a fix voltage until my battery is almost dead?

I am experimenting with a simple circuit. I have an Arduino board, a proto-board and an IR sensor (that uses electricity from the Arduino board). I use a 9V battery to feed the Arduino. My problem ...
0
votes
1answer
60 views

Phase Difference

$$i_1 = sin(wt +45^0) $$ $$ i_2 = -sin(wt +60^0)$$ Question : what is the phase difference dows i1 lead i2 My method 1 ) Eliminate minus sign that is i2 = sin(wt + 60 + 180 ) = sin(wt + 240 ) ...
6
votes
4answers
380 views

What exactly gets “worn out” and damaged by heat?

Its quite common knowledge that heat is bad for electronics. That constantly high temperature decreases the expected lifetime of computer parts even if it's not overheating per se. If, for example, ...
-5
votes
1answer
64 views

Is it possible to “record” an electric signal sent from a PC motherboard to the old “buzzer”? [closed]

First of all, sorry if I use the wrong terminology. I would like to know if it's possible (and how) to record the signal that a motherboard sends to the buzzer (the internal speaker), so that I can ...
1
vote
2answers
216 views

What is this inductor looking (RF) component?

This PCB antenna circuitry supposedly is able to transmit on both 406MHz and 121.5 MHz. I can clearly see a micro-strip printed antenna. ...
1
vote
1answer
120 views

What are those “cheap” parts kits made of

I hope this will not be categorized as buying related question because my question is not really on should I buy this or this. I usually find some parts kits, usually resistor/capacitors/trimpots, ...
2
votes
1answer
111 views

PCB component with abbreviation SR1

I have a laptop battery pack with a fried component (visually fried) that has the appearance of a large surface mount resistor (only 2 connectors). It has the PCB abbreviation next to it of "SR1" ...
-6
votes
1answer
98 views

AN7323 what does it do? [closed]

Does anybody know what this chip does? I can't find a datasheet I think it is a ADC and could use it a lot, if it is. But need a sheet :P
-3
votes
1answer
241 views

How to design a schematic diagram of amplifier that can drive 8 ohms 0.25 Watts speaker? [closed]

I have here a schematic diagram for amplifier that drives a 0.025watts 8ohms speaker. But what I need is an amplifier that drives a 0.25 watts 8 ohms speaker. So, here are my concerns: How can I ...
1
vote
1answer
83 views

How should I detach those kinds of components on my motherboard? [closed]

How should I detach both components linked by white, blue and red wires from the computer motherboard on the attached picture? Just pulling them? Indeed, I don't want to damage them.
0
votes
1answer
38 views

In a tristate buffer which transition time should be larger

I was having a doubt related to tristate buffers. I know that a tristate buffer allows an output port to assume a high impedance state in addition to the 0 and 1 logic levels, effectively removing the ...
2
votes
1answer
123 views

Building a simple PC - looking for a CPU [closed]

I would like to build a computer. It is a child's dream that I had and now that I am at college, I finally gain the knowledge I need. I want it to be simple. I admire the early designs of 1990's ...
2
votes
2answers
184 views

Microcontroller Protection

I used microcontroller for wireless application. Problems arise when I put the microcontroller in high rainfall areas. The microcontroller is often damaged by lightning. How to protect data lines ...
1
vote
2answers
118 views

How to find equivalent components?

Vendor doesn't have the following components: MOSFETs:    P-channel MOSFET    IRF9Z34N    N-channel MOSFET   IRLZ24N ...
2
votes
1answer
94 views

Moisture Senstive Devices - Shelf Life

I have a bag of DAC7512N digital to analog converter from TI. They are still sealed in the original packing, however the caution notes denote "calculated shelf life in sealed bag: 24 months" and the ...