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  1. scottnj

    Computer Speaker Switch

    I want to make a comuter speaker/mic vs headset selector switch. I want to me able to select speakers = (none, desktop speaker, headset speaker, both) mic = (none, desktop mic, headset mic) I was thinking: on/off switch for comuter speaker on/off switch for headset speaker desktop mic/headset...
  2. scottnj

    transmitter module

    I need a 390MHz transmitter module to send a digital signal to a garage dooor reciever. Do most garage doors use amp or freq modulation? Where can I purchase this? It seems everything on the internet is 433, 900, and some in the GHz range.
  3. scottnj

    project boxes

    Nice boxes Steven, they look nice, plus easy to construct. Here is a link to your thread: http://www.electronics-lab.com/forum/index.php?topic=1469.0 I just wanted to start a thread where people put thier project box ideas and resources. I forgot to include building your own.
  4. scottnj

    beep or chirp sound

    I found some software to generate signals. Its called speclab and does a lot of other things to. http://www.qsl.net/dl4yhf/spectra1.html I liked the 2kHz-3kHz range. How different will these sound compared to a pure sine wave? I guess it doesn't really matter, since these seem like my best...
  5. scottnj

    beep or chirp sound

    Looking in the mouser catalog, there are a lot to choose from. It looks like I may have to buy a few different ones to see what frequency sounds best. Are there any computer programs that let you enter a frequency and play it through the speakers? How loud are these things? They seem to range...
  6. scottnj

    beep or chirp sound

    Thanks Alun, That sounds exactly like what I need. Easier the better. I don't want it to be adjustable, I just got confused from trying to read some other web page.
  7. scottnj

    beep or chirp sound

    I have a PIC in my project, I think I can turn a pin on/off in that frequency range. Is this how the buzzers work? If so, I adjust the tone in my firmware? Can you adjust volume? I would like to minimize components and keep to a small space. The PIC can only source/sink ~25mA.
  8. scottnj

    beep or chirp sound

    A piezo buzzer will make a beep? Then why do they call it a buzzer? ;D How do you use these? Can you set the tone?
  9. scottnj

    beep or chirp sound

    What device is used to make a nice beep when you push a button?
  10. scottnj

    project boxes

    What are your favorite places to find project boxes? Who has the best assortment? Who has good prices? Who has good quality? ...
  11. scottnj

    tactile vs pushbutton switches

    What are the difference between tactile and pushbutton switches? What are the pros and cons of each?
  12. scottnj

    I need help with a transmitter

    I found the manufacturer of the transmitter on the web. The spec sheet has the following info http://www.touchtronics.com/images/p814-n2.pdf So the transmitter transmits at 303MHz. After a quick search on google I found this http://www.computronics.com.au/module/txrxpair/txrx_data.pdf which...
  13. scottnj

    I need help with a transmitter

    I forgot to mention, I do not have an oscilloscope.
  14. scottnj

    I need help with a transmitter

    I have a 4 button remote control. I want to incorporate this functionality into my own project. The main IC is a MC145026D, which I have found the datasheet for. I can get the same IC (dip, not surface mount). Then I guess I need to match the clock rate. I also need to find out what frequency...
  15. scottnj

    up/down counter with 0-15 bcd output?

    Thank you so much, that website was very helpful. I read through the whole site. I didn't know about switch bounce, and how  it will mess up counters (I am not that far with my breadboard yet) . I am planning on controlling the up/down with a dual throw toggle switch.
  16. scottnj

    garage door opener

    What would be involved in making a garage door opener transmitter? I was planning on just buying a generic transmitter, and running some wires between my project and its switch contacts. A much cleaner solution, would be to just build one into my board. Does anyone know where I might find a...
  17. scottnj

    up/down counter with 0-15 bcd output?

    I am looking for an up/down counter that can give me a 0 to 15 bcd output. All the ones I have looked at are 0-9. I found the Maxim ICM7217AIPI which does 0-9999 plus drives the 7 segment displays, but costs ~$14 at newark and is probably overkill. Am I missing something, or just looking in...
  18. scottnj

    Duplicate threads and circuit requests.

    I agree 100% with Ed, I just discovered this forum because I just began working on some projects. I think it is a wonderful source of knowledge. If you want to encourage beginners to post, I suggest adding a newbie category, add a faq as a sticky to it as well as other popular questions.
  19. scottnj

    12vdc->9vdc

    thanks for the help everyone. Is there any downside to using a voltage regulator? After some reading, the lm7809 looks easy enough. I think I might also build the lm317 variable power supply, like I said, I'm bored and want to learn some things.
  20. scottnj

    12vdc->9vdc

    thanks for the quick replies, this is a cool forum, too bad most of the topics are over my head. For the standard garage door buttons, I would try hooking directly up to 12v. But I have a couple specialized transmitters I do not want to risk frying.  ;D I think it will be worth my effort to do...
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