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About scottnj
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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 mic selection switch on/off switch for mic mute My questions are: a) Is there any thing I can do to minimize noise added to the system (pcb layout, type of switces,...)? b) What does each section on the round plugs corespond to (where do I put my switches)? c) I want to add LEDs to indicate what is turn
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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.
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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.
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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 option. Now I just need to figure out the db.
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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 from 70-105db, but I don't really know how loud that is. I want to be able to easily hear it, but not be anoying. Any recomendations for a starting point so I don't spend too much $.
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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.
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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.
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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?
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What device is used to make a nice beep when you push a button?
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What are your favorite places to find project boxes? Who has the best assortment? Who has good prices? Who has good quality? ...
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What are the difference between tactile and pushbutton switches? What are the pros and cons of each?
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I need help with a transmitter
scottnj replied to scottnj's topic in Electronic Projects Design/Ideas
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 will transmit at 303.875MHz. I am new to RF, should something like this work? I am guessing "Cycles = 32,400 One Second Pulses" is a typo, maybe they mean 32400 pulses/second? The 16 pin IC is just an encoder. It sends the addresses and sata out in serial. The data sheet is here http://www.freescale. -
I need help with a transmitter
scottnj replied to scottnj's topic in Electronic Projects Design/Ideas
I forgot to mention, I do not have an oscilloscope. -
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 this transmits at, then I can just find a transmitter module that matches. How can I figure out what frequency this transmits at? What is the clock rate? What are the other surface mounted components? They are: blue with numbers black with numbers light brown with what looks like Y0 brown silver
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up/down counter with 0-15 bcd output?
scottnj replied to scottnj's topic in Datasheet/Parts requests
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.