Simple SMPS schematics and projects from Internet.

Recently I've been reading about the various types of SMPSs. These are designs which I haven't been taught about during my college years. I got interested in them and I did some research on the Internet. Some simple designs for DIY projects caught my attentions, so I copied them on Ms-Word files to print and read carefully.
So here you can find this files if you are interested.
LINK

All the material comes from the Web. You can easily locate the initial source if search for them with Google... You can just download them from here to save time...  Please note that no design has been tested.

Be reminded that these designs are for circuits directly connected to the mains and therefore constructing them is Dangerous!!!

Smart Battery charger

Smart Battery charger with ATtiny13 

Constant current charger for rechargable batteries and trickle charger for Alkalines.

After a lot of experimentation this is an improved design of the alkaline battery trickle charger presented in a previous post. The new design charges alkaline batteries with fixed peak, variable duty cycle current pulses and automatic shut down. In addition, one charging mode can be used to charge NiMh or NiCd batteries with constant current. Actually, I was somewhat disappointed from the alkaline batteries charging results (lots of leaking), so I though that I should find a better use for my hardware.

This is the schematic of the improved charger.

Apart from the code the difference from the previous circuit comes from the way the T1, T2 transistors are placed. Once T1 is turned on by the μC it provides current (around 10mA) to the LED1. Voltage drop on this LED is constant and depends on its color. (1.6V for RED diode, 1.9V for green, 3V for white).

An interesting site on electronics and some files to print

I’ve been playing with electronics since I was a teenager. From those days, during the fabulous 80’s, there are many things that have changed scientifically in this field. But still some circuit designs can endure the test of time. Such circuits are fine for experimentation for the everyday hobbyist.

Although I had acquired some formal knowledge on electronics and electricity in general as college student, the information I find in some selected sites on the internet is really invaluable. One such site I distinguish is this: Talking Electronics. If you are interested in electronics before the days of Arduino read on...