kuma_no_pooh
Newly Enlightened
- Joined
- Aug 21, 2005
- Messages
- 4
Hi folks,
Kinda new here so my apologies in advance if this is the wrong place to post this, but after a fair bit of searching I can't seem to find what I'm looking for so this seems like as good a place as any to start. /ubbthreads/images/graemlins/smile.gif
I'm sure we've all seen any of the various cell-phone powered LED antennae, charms, keypads, and whatnots out there that light up when near a cellphone at power. I know they're basically low power LEDs fed by the RF energy coming out of the phone. Some even have little switcher circuits that blink and do patterns and such. Sometimes a fair number of LEDs can be powered this way (I've seen upwards of 8 or more).
I've searched here, Googled it to the best of my ability, and checked the LED resources online that I know to no avail. Since this circle is fairly new to me I admit I've probably missed some good resources, and I'm pretty sure at least sometimes I'm not uttering the proper Bugs Bunny "magic woids and phrases".
Does anyone have any reference on the actual electronics involved to build a small circuit like this? Given the size and minimal cost of the products I know it can't be complex circuitry, I'm just drawing a blank on finding how to build a small circuit like this.
I saw someone else's post here recently on LECs (Light Emitting Capacitors) and while I have to admit I have more more experience with SEDs and LERs (Smoke-Emitting Diodes and Light-Emitting Resistors) than LEDs, I think nonetheless I could do what I'm thinking about doing if I could find a push in the right direction on how to power a small LED circuit from RF energy.
All I'm looking for is a small RF powered circuit (ideally tunable, or peaked at 1900MHz) to power 4-6 small low-power LEDs. Nothing fancy, but the little devices I've purchased to tinker with really aren't all that open to disassembly (they're little epoxy blobs with wires running out).
If anyone has any guidance, experience, or pointers to some documentation I'd greatly appreciate it!
Joe
Kinda new here so my apologies in advance if this is the wrong place to post this, but after a fair bit of searching I can't seem to find what I'm looking for so this seems like as good a place as any to start. /ubbthreads/images/graemlins/smile.gif
I'm sure we've all seen any of the various cell-phone powered LED antennae, charms, keypads, and whatnots out there that light up when near a cellphone at power. I know they're basically low power LEDs fed by the RF energy coming out of the phone. Some even have little switcher circuits that blink and do patterns and such. Sometimes a fair number of LEDs can be powered this way (I've seen upwards of 8 or more).
I've searched here, Googled it to the best of my ability, and checked the LED resources online that I know to no avail. Since this circle is fairly new to me I admit I've probably missed some good resources, and I'm pretty sure at least sometimes I'm not uttering the proper Bugs Bunny "magic woids and phrases".
Does anyone have any reference on the actual electronics involved to build a small circuit like this? Given the size and minimal cost of the products I know it can't be complex circuitry, I'm just drawing a blank on finding how to build a small circuit like this.
I saw someone else's post here recently on LECs (Light Emitting Capacitors) and while I have to admit I have more more experience with SEDs and LERs (Smoke-Emitting Diodes and Light-Emitting Resistors) than LEDs, I think nonetheless I could do what I'm thinking about doing if I could find a push in the right direction on how to power a small LED circuit from RF energy.
All I'm looking for is a small RF powered circuit (ideally tunable, or peaked at 1900MHz) to power 4-6 small low-power LEDs. Nothing fancy, but the little devices I've purchased to tinker with really aren't all that open to disassembly (they're little epoxy blobs with wires running out).
If anyone has any guidance, experience, or pointers to some documentation I'd greatly appreciate it!
Joe