Friday, December 30, 2011

Pellet boiler as electricity generator

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 schematic simple

great circuit, simple and scalar able.

'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'

http://electroschematics.com/4746/solar-charger-circuit/

Monday, December 5, 2011

Inductance Meter based on 555.

There are three 'main roads' to measure a inductor:

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.



This is all electronic needed. I also plan to mount a range selector latter (i will the opdate schematic and also insert 1:1 picture of the scale.)


The ne555 at work


This is the induction meter, maybee i will put it into a box ;)