
A simple feeder for small birds can be done literally in minutes, using a tin can and a stick of wood or a suitable diameter of the branch.
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THE LIGHT WILL ACTIVATE THE SIREN
The proposed German magazine "Funkamateur" light relay is activated when light falls on the photoresistor R1 (see diagram) — when this occurs, a loud siren sound. Transistors VT1, VT2...
CRUSHED GRAINS? NO PROBLEM!
In the journal "Modelist-Konstruktor" No. 2 for 1989, material by A. Baklansky from Kremenchug, Poltava region, was published about a micro mill that he designed for his household.
This...