Saturday, December 31, 2011
Friday, December 30, 2011
I tryed this in 2009, using front plate of the Pellet boiler as heat source for the thermoelectric element (peltier). I burned more than 5-6 of them to dead, the plate temperature went op to more than 180 c .
So, now i made a air space gab at 1 mm to the hot plate, and automatic temperature protection. A gear motor will turn peltiers away from the plate if more than 100 c comes to the peltirs surface.
Friday, December 23, 2011
'solar charger circuit that is used to charge Lead Acid or Ni-Cd batteries using the solar energy power. The circuit harvests solar energy to charge a 6 volt 4.5 Ah rechargeable battery for various applications. The charger has Voltage and Current regulation and Over voltage cut off facilities'
Monday, December 12, 2011
Monday, December 5, 2011
1: buy inductors with colorcode
2: Use a tonegenerator and a osciloscope to calculate inductance : http://et.nmsu.edu/~etti/fall96/electronics/induct/induct.html
3: Build a L meter / Induction meter http://apexys-toan.blogspot.com/2011/02/ne555-based-inductivty-meter.html
Below i build the inductance meter found at apexys-toan blog.
The schematic is borrowed from the projects homepage, hope this is ok, I will remove the schematic immediately on request from the author.
coil color code
In the original project a 40uA / 2500 ohm meter is used, my meter is 100 uA and 1000 ohm, and works well. I am not sure how to calculate the scale. I found tree inductors vwith colorcode on and plottet them into the scala. I have desided to buy cheap small inductors in different values, to calibrate the scale.
The ne555 at work