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Low Cost Wireless Transmission Power Test Pen Circuit

2016-11-10 22:19  
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Low Cost Wireless Transmission Power Test Pen Circuit
I make some testing tools according to my over 20-year wireless work experience and one effective handset interphone transmission power test pen circuit is shown as the picture.If it is installed inside the multimeter's pen, as long as we make stylus approach to interphone's antenna top.And we can judge whether the interphone has transmission power or not accurately by the LED,D2's lightness and judge emitting power magnitude roughly according to LED's lightness and darkness degree.And its production cost is no more than RMB one yuan.