Lee Devlin

Member Since: July 17, 2008

Country: United States

Profile

Bio

Engineering consultant from Greeley, CO

Role

Independent Consultant

Organizations

Devlin Consulting, Greeley, CO

Programming Languages

assembly, C++, PHP, Javascript, Basic, Linux shell

Universities

Penn State

Expertise

electrical and mechanical engineering, product design, renewable energy

Interests

aviation, experimental aircraft, electronics, computers

Websites

http://k0lee.com http://devlin-consulting.com

  • Product COM-09807 | last year

    Axla seems to imply that the behavior dustinandrews describes is correct but he actually described a normally closed switch momentary contact switch. Which is it really? Normally open or normally closed? In the case of momentary contact switches, the word ‘normally’ implies the non-activated state.

  • News - Free Day, Lotteries, and … | about a year ago

    I participated in all of the free days because it was such a thrill to see something that was so unusual being undertaken by a tech company. The first two were a little disappointing for me (because I didn’t win) but the third time was a charm. But it took about 4 hours of typing in capchas before I finally got through and it was a such a feeling of achievement that I recall it fondly to this day. I wondered when the music would stop with free day, and it appears that today is the day.

    What amazed me most about free day was that even though a lot of people participated, only a few % of the participants were able to ‘win’ if you did the math and I understood that. And most of the losers were good losers. But for a few of the losers, there was no consoling them. They were irate about their loss and very much wanted to share their pain. Doggone it, they deserved to win, but they didn’t. I could hardly believe the fury in some of the complaints as I read about the injustice of it all. I wanted to say, “Hey, it was worth $100, you didn’t win it, please get over it and stop dragging me into your nightmare.” but I refrained out of respect for their compromised mental state and partly out of fear they’d decide I was the reason they didn’t win. You can’t mess with some folks when the lose a competition, even if it was more of a lottery than a competition.

    But in the end, I just want to thank SF for thinking outside the box and doing thing that they lawyers said might be a bit risky, because it really helps to differentiate the company. Perhaps free day has finally run its course and it’s time for something new.

    I participated in the Kickstarter educational tour program and was a bit disappointed it didn’t get fully funded. But it appears you haven’t given up on it and whatever you decide to do with it, I’ll be happy to help out in any way I can.

  • Tutorial - Lessons from Rebuilding Illumitune | about 3 years ago

    Great post! About half of the links to products ended up in my wish list and I can’t wait to get my hands on them :-). I love the way you guys share what you learn. Keep up the great work!

  • Product KIT-09612 | about 3 years ago

    I had a problem with this amplifier clipping and the ‘peak’ LED flashing when only a small signal was applied and volume set to a low value. The audio output was very low, about the same p-p voltage as the input. Anything more than 200 mV p-p caused clipping and the peak LED to come on continuously. Also, the amp was drawing 11 watts and the heatsink getting hot with no signal.
    The problem turned out to be the connections to my speakers. They were a pair of horn speakers (like for a PA system) and they came with 1/8" mono jacks on them. So I installed mono receptacles on the aluminum enclosure. This had the effect of tying both speakers' negative wires together and that apparently caused the clipping at low volume and excessive power draw.
    Just thought I’d mention this for anyone else who runs into a similar problem. After cutting off the jacks and wiring the speakers directly into the terminals on the board, the problem went away. It now draws less than a watt when idling and the heatsink runs cool and the amp produces more than sufficient volume.

  • News - Eco-Gym | about 4 years ago

    I posted about this topic a while ago in my blog.
    http://k0lee.com/2008/01/electricity-from-human-power/
    The executive summary is thus:
    A person can generate about $.06 of electricity by exercising at a respectable rate (75W) for 8 hours a day. However, you’d have to double your caloric intake to maintain your weight if you did that much exercise. Do you think you could double your food intake for an extra 6 cents a day? And how would you feel about making an effective wage of less than a penny an hour?

  • Product DEV-09829 | about 4 years ago

    Not only are the wiring diagrams for the LM335A and TMP36 completely different, so is the formula used to determine temperature for each device. If you download the code for Circuit 10 from the ardx.org site, you will need to modify it to work with the LM335A. The TPM36 puts out .5V at 0C whereas the LM335A puts out 2.7315V at 0C. So you need to change this line:
    temperature = (temperature ? .5) * 100;
    to
    temperature = (temperature ? 2.7315) * 100;

  • News - SparkFun Gets a Cease and… | about 5 years ago

    Sun is currently in its death throes, and this desperate attempt to shore up what is left of its intellectual property is further evidence of its imminent demise. I wrote about it a few weeks ago here:
    http://k0lee.com/2009/10/sun-also-sets/

  • | about 5 years ago

    Product Tee! I want one… I’ve already got the red one you currently sell.

  • News - Problems with Intellectua… | about 5 years ago

    At the Entconnect Conference in Denver last month, we had an IP attorney tell us that it costs about $1M to defend a $1M patent, making it essentially worthless. A $10M patent costs about $2.5M to defend.
    If you want to estimate the value of a patent, figure out the number of products sold that would use that patent in countries where patents are honored, multiply just the value that the patented feature would add to that product by about 3%, and you’ll have a rough figure. Using that yardstick, there are very few patents issued that are worth even $1M.
    As far as big corporations go, patents are just a cost of doing business. If you don’t have a war chest of patents, someone (usually a competitor) will use theirs to squeeze some money out of you. Technology companies try to acquire enough patents so they can eventually enter into cross-licensing agreements with competitors to make their patent pain go away.

  • News - Geek Tour 09 | about 5 years ago

    I hope you will fill us in about this trip next month at EntConnect. Hong Kong is one of my favorite Asian cities. Take note of the contrast as you travel into China’s mainland, as I suspect you’re doing right about now. It’s something you’ll remember for a lifetime. My trip from Hong Kong by boat up the river to Shunde City is still fresh in my mind despite nearly a decade that’s passed since I was last there.

No public wish lists :(