Need help with intercom system?
Hey everyone I am sorry if this is the wrong place to post I just thought you guys would be the most knowledgeable. I have several of THESE I got them thinking it would be a good system. But they do...
View ArticleNeed help with the MSP430's sequential multi-channel ADC mode when using an...
Here's what's going on. I wrote some code to use four pins as 'voltage probes' and one pin as a lower voltage reference. When I test the code on a simple three-resistor circuit, the results are...
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Making my own USB cable
I am looking to making a Apple 30 Pin to USB type B cable for use with my DAC for my stereo. I have tried looking online, but this cable does not exist and I cannot find any ways to create one myself....
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Testing a whistle recognition algorithm on a cortex m4 (more details in the...
submitted by limpkin [link][3 comments]
View ArticleHomemade electric bicycle battery question
I am planning on putting the internals of a 36V electric golf cart on my bike, and i can figure out all the connections and wiring, but i havent been able to find any decent deep cycle batteries that...
View ArticleI just finished my first eagle project. I have no errors, but I'm still too...
I'm sure my actual PCB design is atrocious, but before I send it off for a couple prototype boards, I'd appreciate it if someone would check my work. I'm especially worried that I did my ground plane...
View ArticleSimple analog audio filter question.
Hi Guys,I have built a small microphone circuit with an electret mic and LM238 and can successfully read the signal with an Arduino.The microphone is only going to need to pick up prolonged yelling so...
View ArticleWhat did I fry?
So here is my setup: http://imgur.com/uQxUg4dSo I was playing with my Atmega setup and had an LCD board hooked up to it on a separate breadboard. I am using the positive and negative lines on the edge...
View ArticleWould it be hard/expensive to build myself noise-canceling headphones?
Everyone has beats headphones, and I thought it would be cool to try to build some of my own noise-cancelling headphones. I was in a circuits class, and we built noise-cancelling headphones, so I have...
View ArticleHow can I run this on a battery?
I'm working on a school project, and basically we need a way to run a piezoelectric transducer off of a battery.Piezoelectric transducers are the pieces in humidifiers that produce a cool mist. They...
View ArticleDoes anyone know of a great DIY Electronics book?
Hello everybody!I am fairly new at electronics; However, I do have knowledge of the components and simple equations like Ohm's Law and the power ones. Does anyone know of a book that can teach me how...
View ArticleLarge list of IC manufacturer logos, with links to their web pages
submitted by dextroverted [link][1 comment]
View ArticleWhat are the essential 74xx and 40xx ICs that everyone needs to have?
submitted by iiiioooo [link][14 comments]
View ArticleWhy does this happen?
This morning my clock radio went off. It's tuned to the local NPR affiliate. I like listening to "Morning Edition" as I stumble around the house trying to get my mangy carcass ready for another day of...
View ArticleI2C or SPI input IC/chip with rendered PAL/NTSC video output?
Is there an IC or chip which can take simple input of text, lines and circles from my microcontroller and output PAL or NTSC video through a composite connection? I haven't been able to find anything...
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My first project for sale - Supercapacitor Garden Light
submitted by rtpreppers [link][9 comments]
View ArticleBuying a TV tomorrow from Best Buy...what do I need to know?
I have $300 in gift cards from Best Buy that I'm looking to pick up a TV with, you hear so many horror stories about Best Buy's shady practices that I'm hoping to get some insight on what to look for...
View ArticleInductive vs. Solid-State Transformers
I came across this link: http://support.radioshack.com/support_tutorials/batteries/pwrgde-2F.htmIt looks fairly old, so maybe it's not relevant now. Either way, the site's point was that[Solid-state...
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