The simplest “neprolivajku” for the paint or varnish can be done EA literally two minutes, if you drive in a Board cut two nails and pull them rubber ring cut from a Bicycle or a car camera.
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ACOUSTIC PROBE
The magazine "Amaterske Radio" (Czechoslovakia) proposed scheme is a simple audio probe to detect logic levels; low (logic 0) and high (logical 1). The device consists of a bitonal...
FLOUR GRINDER…
Increasingly, the editor receives letters and phone calls with the same request — to publish drawings and to talk about how to make your own hands a simple mill. The need for this device...
