If you have an old inflatable mattress, consisting of several independent sections, it is easy to adapt as life jacket for boating. You will have to sacrifice one of the middle sections, making it T-shaped hole for threading of the head. To fix the other slightly inflated section around the torso using the waist belt and extra lacing.
Recommend to read
POWER SUPPLY WITH ACTIVE FILTERS
For portable electronic equipment need a small volume and weight of the power supply. To solve this problem relatively simply by replacing passive LC and active RC filters. The...
FROM “SPIDOLY” LAB!
(Continued. Beginning in №1,2,3 '2005) Instruments based on radiopriemnye. Audio amplifier Audio amplifier (uzch) is formed from the staff of the cascades on transistors VT7...
