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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

    beep or chirp sound

    What device is used to make a nice beep when you push a button?
  4. 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? ...
  5. scottnj

    tactile vs pushbutton switches

    What are the difference between tactile and pushbutton switches? What are the pros and cons of each?
  6. 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...
  7. 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...
  8. 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...
  9. scottnj

    12vdc->9vdc

    In my wheelchair, I have two 12V batteries wired in series. I would like to wire a few devices directly to these batteries. The first items are a few transmitters (garage door buttons [9v battery]). What circuit do I need to put between 12/24V battery and the transmitters?
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