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Extracting maximum power from handheld LED flashlight?
Data obtained. Sorry for the delay.
Graph on the left shows the peak output power obtained, right shows the RMS value (didn't manage to set the avg value from the scope).
Circuit was AC Source -> Diode Bridge (BAT85) ->Tank Capacitor...
Sorry I didn't have time to thoroughly test it, but here's what I got with one strong push.
The generator is connected to a 1N4007 full bridge, 47uF, and various resistors.
The graph is Power (W) against Load (ohm).
Power was found using V^2/R as suggested by kak111.
The power was half of...
Thanks, clear and concise. I'll try this, this afternoon.
Thanks for the suggestion on the 100-200Ω range. I'll narrow it there after I test the others with a larger load.
I've got another question, if I have connect a NiMH rechargable battery as the load, I'm guessing that the load becomes...
Thanks, so it's an estimated 0.13W~0.2W.
If I were to disconnect them(LEDs) and wire a load across the terminals, how much Ω do I put to as load to draw maximum power ?
I ask the above as I've seen the many piezo papers detailing how they put high kΩ resistors as loads to obtain maximum power...
Extracting maximum power from handheld LED flashlight?
Hello I have got a electromechanical device that I'll be using to gather some data soon.
It's a small hand held generator that lights 2 LEDs. This: (http://i01.i.aliimg.com/img/pb/710/380/403/403380710_296.jpg)
I'd like to know how do I...
Now that you mentioned noise coming from synth chips, I've checked the datasheet for the AP89010 and I think he's running it out of spec for the Osc function (R4).
Datasheet here Page 15 Oscillator Table only states up to 25 kHz with a 43 kOhm resistor.
I don't see any maximum nor minimum rating...
What is the purpose of R3, 368ohms ?
Wouldn't that force the volume control to be very loud ?
Where is your +5V coming from ? Perhaps adding a bypass capacitor if the source has ripple ?
A very lousy and cheap method to reduce noise on your output would be adding resistors in series with the...
What is the Wattage Rating for speaker ? How many watts do you intend to drive it to ? Will the LM386 able to handle the wattage at its output pin ?
VCC_ARROW, how many volts is that ? +12V/+3V/+5V ?
By noise, do you mean blarring like trumpets(distortion) or hissing ?
Hi I would like to know if the lm317 works from 4.2V-3.3V regulated down down to 3.0V. Multisim is unable to simulate 4.2V->3.0V with LM317H, so I was wondering if the hardware actually works.
It outputs a shape like so:
**broken link removed**
Lowest woltage was 1.99V.
Does the real world...
Re: Battery Monitor; 12F683 ADC 12V|4.2V switchable -ON HOLD
"Can you explain what voltage you want the PIC to have on it's VDD line. "
err... both voltages. When the 12V is plugged in, the PIC is powered with the regulated 3.3V(w/ diode[if the circuit with diode was working]). However if the...
Re: Blocking reverse DC voltage ? 12F683 ADC 12V|4.2V switch
All right updated the first post hopefully it would be more readable now. Sorry for that. If anything is not clear please comment. I am really bad at presenting things.
Topic put on hold, I think the simulation had a short.
I have a circuit that is powered by a 12V or 4.2V battery source, for versatility reasons.
This circuit will be used to monitor either batteries. If they fall below a range, LED(not in pic) lights up.
The circuit should be designed to work...
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