Hi, I'm trying to generate 3 x 30kHz signal each phase seperated by 120 degrees. These 3 phase will be used to turn On/Off FETs that will power some high frequency transformers.
What I'm looking for is the lowest cost effective solution to generate the signals. I was thinking of using 3 Op-Amps...
Hi, I'm trying to measure the average current going to a LED that has PWM (100kHz). I used to use a 10 Ohm resistor and a 100uF cap in parrallel that I would put in line with the LED. Problem is that 10 ohm has too much impact on the circuit, using a smaller resistor like 1 ohm or .1 ohm would...
Hi, I'm trying to raise a battery voltage from 0.9-1.5V to a stable 3.3V (20mA to 60mA).
I'm using a charge/pump inductor with a capacitor to smooth the whole thing.
I'm planning to use feedback voltage to keep the output stable. But I'm not sure how to proceed from here. I tough of using...
Hi, I have solar panels without specifications to test and I'm trying to reproduce the solar light or a light that would give me as much power output from the solar panel then if it is facing the sun.
So far I built a cube of 18"x18" with 4x40W Compact Fluorescent + 1x70 Metal-Halide and mylar...
Hi, I have got a solar lamp in my hands. Basically it's a photo-voltaic cell, with 1xNiCd 1.2V battery and a 3.3 white LED.
The circuit is some sort of controller that will on/off with light exposition to the CDS. It will also boost the 1.2V input Voltage to around 3.1 V. It seem to use some...
Hi, I know that white LEDs have some patents on them. But my problem is that I buy my LEDs in China and that I have to believe the LED manufacturer that he paid it's dues to the right company.
Is there a way to verify that a manufacturer has an agreement with one company?
How can I tell I'm...
Hi, I'm trying to charge batteries with solar cells. My problem is dimensioning the solar panels correctly.
From what I understand most solar pannel are about 12% efficient. So at 12:00 and around (100 000 lux) I could expect 120 W/square meter (sun is 1000 W / meter).
My question first...
Hi, we currently have a wide range of LEDs (582 to 602 nm) we need to keep only the ones around 592 nm ±1 nm. This is very hard to see the difference by eye (selection will be made in china so worktime is not an issue). So what I tough was that we should order a light filter that will only let...
Hi, I'm in the process of designing a control unit that will be on the secondary of a 12V AC transformer. The control unit will control around 100W.
I am wondering what type of design should be used:
- Mosfet switch
- Thyristor switch
- Relay switch
What would be the average losts in % of...
I there, I'm currently searching of the best way to make a rectangular bac that will have to hold water. It will be about 15x6x8 cm. It's upper face will be assembled in two pieces.
See the following image: http://pages.infinit.net/f199/Mold.gif
*note: corner will be rounded
I'm searching for...
Hi, I have a cracked windshield and been wanting to copy it so that I would have a new one.
I tried to mold plexiglass over it with a heat gun... very hard work and always ugly.
I tried to make a ciment mold that would be raised to high temp and then mold the fiberglass with a heat gun on...
I'm searching for ways to create a liquid flow to increase heat transfer.
The coolant temperature is -15 celcius so as the ambiant temperature. Problem is that this system is insulated and therefore I cannot use an outside electrical current to power a pump.
Here are my stats:
Create a medium...
I'm looking for a formula to calculate water pressure over it's critical point. I have found no informations on how the gas behaves after it. I would need some formula that could give me water pressure for a range of 400 celcius to 1000 celcius.
Thanks
BeerBaron
