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本刊曾介紹过用电子管或断續器等构成的“无线测速装置”,通过看微安表指針摆动或听耳机、流速仪电鈴声响的次数来測定流速仪的轉数訊号。本文介紹的是由一个三极晶体管构成的声响式和灯光閃灼的轉
This article has introduced the use of tubes or interrupters, such as the composition of the “wireless speed measuring device” by watching the micro ampere meter pointer swing or listen to headphones, the number of bells sounding bell ring to determine the speed meter signal. This article describes the audible and flashing turn of a transistor consisting of a triode