Savel brain dump in English!

You maybe noticed time gap in my weblog. I am constructing more complex device at this time and don’t have spare time for usual weblog entries. So I posted only few old re posts and some small note from “vandalising” theme.

My “great” project is seep generator with some additional features.

Final product will output: sweep signal in square, triangle and sin form. Also sweep generator can be used as wide band generator. Also, by adjusting few knobs the output can be transformed to sawtooth- left or right side.

The main device is still under construction, but some results can be posted here:

This is frequency characteristics of standard 455kHz ceramic filter. There is lack of detector and frequency marks, but something is showing. I can not tell that the output is right as I don’t have other equipment to test or compare the results.

Other features: the generator has the frequency modulation (FM) and pulse width modulation (PWM) inputs.

(more…)

Transferred from old and some-why Google banned pages.

Chip, PCI/AGP/ISA/MCA/CPU and etc. slot desoldering from PCB board

After lots of experiments of desoldering multipin parts from PCB using fancy irons, gas torches, hot air guns and other stuff I “invented” this technology. Using this technology all parts do not get mechanical stress and PCB board is not damaged. This method is ideal for multilevel PCB. I didn’t find any damage to parts caused of using this technology. The only bad side of this technology that ALL parts are desoldered. It is impossible to desolder selected parts.
This technology is free for personal use. If you want to use this technology in industry, please contact me as it is © by Levas.

Preparing: Remove all jumpers, batteries, socket-ed parts. Also remove all plastic mounting devices used to fix board in casing. Check solder side for bent pins. Prepare grill grid and few vials for collecting fat. Better use 3 ones. One in oven, two other on floor.

(more…)

I was asked to switch load using computer’s COM port (RS232). At first, I was thinking, that I need to switch some lamp or heater, so I offered to use solid state relay and forget all the electronics. But later, I was explained, that I need to manage wireless access point connected to router. As the access point tends to hang-up the administrator need to reboot it. Automatically from linux router script.

I offered simple variant- use the mosfet. Here is the first version of the device in mine breadboard… somewhere in this image.

(more…)