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Probe domestic double-head probe 038-BB-5.7L The shape of the two ends of the needle is outside the pointed needle Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM 
Circuit Description: As long as switch S1 is on, the 555 timer can quickly generate a series of pulses. These pulses are counted in groups of 16 and converted to binary form by 7493 and then applied to the 74154 (one of the 16 decoder/multiple output selectors) wiring so that each of its 16 The output lines of the road will decrease in turn.