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Simple auto resetting, light detecting circuit.

noreply@digikey.com — Wed, 12 Jun 2013 22:12:21 GMT

Hi,

I'm new here, as you are going to see, I'm working on a quick little project for a special circuit that can detect whether or not a bulb is turned on and if it is not then try to turn it on again by resetting it.

I am looking for either a phototransistor or something that will work similarily that can detect whether a bulb is on, and that is able to distinguish from normal daylight.

As well as that, I am looking for a circuit breaker (or similar circuit element) that contains an auto reset (about every about 5 seconds) when it detects a small voltage and it can reset the circuit.

is this possibe?

attached below is my schematic for this circuit, it's pretty simple and straight forward.

Thanks for the help! I'm new at this so sorry if it seems obvious to some.

-Scott

Discrete equivalents please.

noreply@digikey.com — Fri, 07 Jun 2013 20:41:37 GMT

I need to replace 6 discretes in an audio integrated amplifier. I have used the search function at the top of the product page, but all come back with none found.

Is it possible if I supply the description (eg 2SA1048) from the Service Manual someone may be able to provide equivalents from the Digikey product range?

Blood Pressure monitor

noreply@digikey.com — Tue, 18 Jun 2013 17:10:42 GMT

I want to calubat it. model:BP710{hem-7113-Z} Omron Healthcare,INC

How long before transistors reach the smallest size possible? What comes next?

noreply@digikey.com — Tue, 18 Jun 2013 15:44:35 GMT

Okay, so according to Moore's Law the number of transistors doubles every two years. This is all fine and dandy but it seems this can't go on for infinity - it defies logic. When do you guys think we'll hit a threshold and what are some of the solutions in the works?

Microcontroller to build "smart dumbwatch"

noreply@digikey.com — Fri, 03 May 2013 06:16:40 GMT

Hi there all!

I have this idea of a project but I am brand new at this stuff so I don't really have any real idea how to start! Basically, what I am looking to do is modify an analog watch by adding an RGB LED in it, then have it controlled by an app (which I will have to program) on my Android via Bluetooth, so it would, for example, blink when I get notifications. An extra added functionality that would be awesome if possible is if I could have buttons on the side to control music.

It would be best if it was very low powered so it only needed to run off a watch battery if that is even possible.

Now, I am a complete noobie. Should I use a microcontroller for this? If so, would you have any suggestions as to which one?

Also, would you be able to point me in the right direction on how to learn more about them? I've searched a bit but because I'm so new to this, I think I just don't know where the proper places to look are.

I am fairly electrically savvy (I'm actually a second-year computer and electrical engineering student) but I haven't attempted anything like this before! I hope you will be able to help me out! And if you need me to be more clear on anything, let me know .

Thanks!

Flex Circuit help

noreply@digikey.com — Sat, 30 Mar 2013 18:59:41 GMT

Hello,

I'm looking for some help finding someone willing to work with me to create a very simple LED circuit on a flexible PCB. I have tried contacting companies myself but they don't seem willing to work on such a simple product. Volume also may be an issue right now, but eventually of course the volume should increase. The circuit is only a battery, switch, switch logic, and a LED. It needs to be flexible because of it's use. Alos, I strongly prefer to have it made in the US. I realize parts may not come from here but I have found a few that are. Any help or recomendations would be greatly appreciated.

Thank you

Programming Question

noreply@digikey.com — Mon, 03 Jun 2013 16:08:45 GMT

Could anyone give me very general idea of how elements like air conditioning controllers so the parts where in a car you setting up temperature, with led displays etc are programmed nowadays? So assuming we have a plastic panel with buttons on it, led display and what not, and when I press "+" I want temperature to be increased or some mechanical parts to take action.

I'm guessing that there is ROM and some CPU chips where software controlling the parts is stored. Now this software is usually written in Java or low level C(++?) or even lower?
Are there any libraries commonly used for this sort of thing? Or the chips come preprogrammed with these and maybe some basic operating systems?
how that chip is programmed with software? There is some sort of ROM writing device needed is that right?
is this something that would be able to play around at home via my laptop and if so what equipment I would need in addition to laptop?

Would anyone be able to point me to resources where I could read more on it? I'm trying to get general idea of how it works, how involving it is and what skills someone would need to get this working. I understand this is huge topic but want to get an idea of how this is done and even though I wont be able to do anything like that myself I would like to understand the process and what's involved

Again, if the questions and my explanation is confusing I apologise. I found it very hard to explain

How advanced of a 3D printer can you make at home? What to look out for?

noreply@digikey.com — Fri, 14 Jun 2013 16:27:34 GMT

Hello everyone, this is a multi-part questions of sorts:

When building your own printer, what are some of the most important components that must to be high quality, and are there are short cuts for cost savings on everything else....i.e.; converting an old PC PSU into a dedicated DC power supply?

Is it possible to create a 3D printer as advanced as the cubify by purchasing parts from digi-key and other vendors?

Do any of you have any experience attempting to build you own 3D printer?

Thanks

-M

Identify a part

noreply@digikey.com — Sun, 09 Jun 2013 04:09:36 GMT

Hi,

looknig to identify replacement part.

small 8 pin smt device.

M=ABT04C

MVABT04C

looked in most top marking references and Internet search... but no joy...

Cut power when voltage drops below a specified level for XBEE S6

noreply@digikey.com — Tue, 11 Jun 2013 20:42:45 GMT

Hey Everyone,

I am currently working on a device that sends UDP packs from an accelerometer through the XBEE S6. I am using the Sparkfun XBee Explorer Regulated board, the Sparkfun Powerfun LiPo Charger Booster. The issue I am having is that I am powering all of this off a battery pack, but when the battery starts to die, and the voltage drops it creates a brown out in XBee WiFi chip and it messes with the firmware. The only solution to this seems to be reprogramming the chip each time this happens.

I was wondering if anyone knows of a small device that reads the voltage and will cut the power if the voltage drops below a specified level, in this case 3.1 volts. Let me know if you need any other information from me to suggest a solution.

Thank you!