While still in school, I restored the spent battery pocket receiver rather primitive, but effective way. With pliers gently removed the graphite rod and filled the battery with water. Then waited until the water completely evaporated, put back stem — and battery-some time worked better than new.
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GARLAND BURN ON COMMAND
This switch Christmas garlands periodically includes four groups of lamps. The switching frequency can be changed within wide limits by the variable resistor R5 (see diagram). ...
QUIET “LITTLE ONE”
Most amateur constructors are constrained not only in space (usually they have only a small corner in their apartment for pursuing their favorite hobby), but also in time (they can...
