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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by narco

  1. N

    Video Signal

    I know that it is possible to send video signal over AC lines, but is it possible to send video signal over DC lines. The particular camera that I have in mind uses three wires. It uses the standard coaxial wire for the video signal, but the shield of that wire is also used for the negative...
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    Dropping DC voltage

    Is it possible to drop the voltage of a car battery (12 volt) to a 9 volt power use, just by placing a resistor in the line?
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    Traffic Light Changer

    If you don't care, don't preach. You have to remember that just because such items are available, does not mean that they are affordable. I work for a municipal police department, and the budget does not allow spending on a piece of equipment (such as the traffic light changer) which costs a...
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    Traffic Light Changer

    Yes this is true, but if you were to price the complete (already built) version of the light changer, you would see that you can build it for thousands of dollars less than you can buy it for. If you have not used one, just say so. Last I checked this is an electronic project page, not a page...
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    Traffic Light Changer

    Its only illegal if you are not associated with a governmental entity, and its use would be used within the parameters allowed (such as EMS, Fire, and Police).
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    Traffic Light Changer

    Anyone seen the kit sold from Kenneke that changes the traffic lights through IR bulbs? Has anyone ever built one? If so, how did it work (or not) and how about sharing the schematics.
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    RF detector

    The link works if you correct the typo. In the begining of the link it is stated as being hptt. All you need to do is change it to http-and the rest of the address.
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    Electronic developing

    Try speaking with professor at a school close to you. I have had sucess when speaking with the professors in my area. I approach them with an idea for a class project. Normally it only costs me the price of the parts.
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    RF detector

    What I had in mind was a detector to detect frequencies in the 150 MHz range
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    House plugs in vehilce.

    Is it possible to install a household plug into a vehilce, so that an inverter is not needed?
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    Frequency grabber

    Anyone ever built a frequency grabber with a digital reading? If so, how did it work out, pros and cons. I one was built, how easy was it to find the parts needed, and how about sharing the schematics?
  12. N

    Keyless entry pads

    Does anyone know how to change the frequency of the keyless pads used for vehicles. I would like to be able to change the frequency so that I would be able to have multiple pads. Anyone ever had any sucess with this?
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    RF detector

    I am interested in building a simple RF detector. One that vibrates upon the presence of RF signals would be great. I would like to use this item as part of a counter surveillance kit that i am putting together. Has anyone built one, or does anyone know where I might be able to find plans to...
  14. N

    Microphone

    I am in the process of trying to build a microphone to record telephone converstaions on cellular phones. The recorder I have has both a microphone jack and a headphone jack. What I would like feedback on is, Is it possible to cut the leads for a set headphones, and solder the leads to the...
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    Transmitter

    Is there any websites that explain in detail FM transmitters. I know the concept, but what I am looking for is the explaination of why it works and why certian parts work and others don't.
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