Need Help Making Circuit
I am working on a small weekend project that involves taking the power from the location on the PCB in a keyboard where the LEDs were and making it act as a switch to a small remote control outlet (Something Like This: http://ecx.images-amazon.com/images/I/410y7UnyvdL.jpg )
I have tried using an LED glued to a photocell, though I am thinking it is somehow acting as a resistor and limiting the power that can go through. I have some transistors, What kind of a circuit can I rig up with them to make this work?
I have tried using an LED glued to a photocell, though I am thinking it is somehow acting as a resistor and limiting the power that can go through. I have some transistors, What kind of a circuit can I rig up with them to make this work?
6
comments
|
Add Comment
|
sort by:
active |
newest |
oldest
Jan 16, 2009. 7:31 PMbenjgvps (author)
says:
I have a remote hooked up to my computer, not the AC :) . I think I will try adjusting my photocell.
Jan 17, 2009. 3:44 AM11010010110
says:
still why not a transistor ? you can use it directly and not like the photo cell for stuff powered from low volt you dont need the relay
Jan 17, 2009. 12:48 PMbenjgvps (author)
says:
Can you give me a picture of a circuit of how I would use a transistor?
Jan 17, 2009. 2:15 PM11010010110
says:
the switched device and the led should have common earth. the transistor switches the device from the earth side the extra resistor is about 470 ohm for small npn txistor (like C945) at 5 V. if the led allready had resistor you should only add resistor so that together they are about 470 ohm the needed value may change depending on many factors
Jan 17, 2009. 6:46 PMbenjgvps (author)
says:
I am not fully understanding the drawing, So I am adding a diagram of what I have. If you can draw the transistor and some wires in there (Even in paint) that would be nice.
Jan 16, 2009. 6:21 PM11010010110
says:
you need small npn transistor and relay and very good isolation so that in no wai 110 / 240 V can get to the computer you can do this as well on the old printer port
 |
Vancouver Mini Maker Faire 2012
Rebuilding NordicTrack ski machine drive rollers
Looking for New Zealand-based Instructables authors for conference on August 27 in Wellington
Call to makers - Brighton Mini Maker Faire
Milk Crates - not as green as you think
TEDxBaghdad - Iraq - violence, dust storms and open sourced manufacturing
UK Mini Maker Faire - The Derby Silk Mill - New Poster to Share!
