the diode and triode online testing machine composed of 556

Published:2011/9/8 6:15:00 Author:Ariel Wang | Keyword: diode, triode , online testing machine | From:SeekIC

The monostable trigger is composed of the other half of 556.The pin ⑤ and pin ⑨ of 556 output 5Hz alternating square wave of which the peak voltage with a pair of reversed polarities is 9V . When the power supply gets through,if LED1 and LED2 give out light alternately without devices (the tubes),then the testing signal souce is normal.If you want to indicate whether the diode and triode are OK or not,distinguish the polarity of the tubes,testing conditions,whether LED1 and LED2 are lighted or not and the testing results quickly with the tubes(i.e. There are lines),you can refer to the chart.



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