As I mentioned in previous post, the power of my FM generator is too weak. At first I decided to build power amp from scratch, but I remembered, that I had old power amp from some ancient car mobile phone. I was lucky and I found it. The last and most powerful transistor is missing, […]
As mentioned in other post, one of possible defects of plasma TV is black line of death. The cause of black line is that the one chip glued to display panel is defective. If only contact of the PCB is damaged, the lines are much narrow. If the “distribution" chip is damaged, the line are […]
From few not working LG plasma TV I made one half working. Just for fun and to test plasma technology. So here is small review of plasma display panel or plasma TV from LG.
Very old (21 years) Panasonic CRT TV and 2004 LG plasma.
Plasma display panel (PDP) is a big glass device- to plates of […]
To make double sided PCB at home you need: double sided photoresist coated PCB material, some NaOH solution (in mine case- simple drain cleaner), some PCB etching solution (HNO3 in my case), some PCB software, good printer, some transparency foil, glue, UV box.
First design your PCB. I am using freeware Eagle. Print sides separated on […]
In other post I mentioned, that my FM generator is too weak to jam radio stations. And I remembered, that I have quite powerful radio transmitter. 16P22B-1 (16Р22В-1, 16R22V-1). It is 146 - 174 MHz FM radio station - transmitter. Output is 8…15W. So it is powerful enough to jam all small town .
I […]
For small amount of money I acquired very old high frequency generator. It is very old, it is made in ~1960. But still working. I opened the case and discovered few radio tubes. Most interesting, that some of the tubes were changed in 1978. All high frequency parts are covered with heavy solid shield. The […]
From local factory received some bad, not working, cable TV distribution, amplifying, filtering, coding and mixing modules. It take few photos of this devices. I think, these devices have too much connectors. Especially that smaller one. It is made only from passive components- no transistors or chips…
The bigger one is more complicated- lots […]
There are capacitors and there are very big capacitors. The last ones are with heavy duty terminal connectors for high current connections, and the capacity of them are quite big. Something like 47000mkf x 80V or 100000mkf (0.1F)x 16V. Such devices can store lots of energy. They are used, when high currents are used in […]
In old magazine (Radio - Радио) I found small article about calculating PWM power transformers. The formulas are for toroid core transformers, but I think, they are usable in standard E core transformers too.
1. Calculate the power of transformer: Pt=1.3*ΣPn , W. The power of transformer is sum of all output powers multiplied by 1.3.
2. […]
There are lots of antispyware - addware software. Some of them are free, some commercial and some contains addware and spyware… So every windows user must know few place in their system to check and remove malicious software.
1. Start menu, Startup folder. Remove all strange, unused software.
2. Visit control panel, add remove programs. Uninstall all […]
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