Of course, thyristor power switches in household appliances is very compact and convenient, but… КУ201, КУ202 and familiar to all cheap copies, unfortunately, tend unjustly to fail. Failsafe only thyristors for industrial use (TL), but they are quite expensive and overall. Besides working, for example, an electric heater thyristor (triac-like) inclusion creates in radios and tape recorders unpleasant 100-Hertz background. So sometimes you have to go back to the old, but tried and tested method on a powerful load through the contacts of electromagnetic relays.
SYRINGE PACKAGE
Today, some liquid or pasty products are sold in soft pack with plastic tip. After using this content pack will be useful for home handyman. For example, it can be filled with a filler or sealant and use as easy-to-use syringe.