Recent content by scottnj

  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.
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