LED_INDICATES_LOW_VOLTAGE

Published:2009/6/29 21:27:00 Author:May | From:SeekIC

LED lights when output of 9-V rechargeable battery drops below minimum acceptable value of 8.3 V, to indicate need for recharging. Can also be used with transistor radio battery to indicate need for replacement. Zener is BZY85 C8V2 rated at 400 mW, with avalanche point at 7.7 V because of low current drawn by circuit. LED can be Hew-lett-Packard 5082-4440,-P.C. Parsonage, Low-Battery Voltage Indicator, Wireless World, Jan. 1973, p 31.



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