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为解决“支农70—2型”等一批老式电测仪钮扣电池无处购买问题,笔者设计了一种钮扣式锌汞电池充电电路.如并联数个电阻,并接一个单刀多掷开关(K),便可用于电子表、计算器、照像机等各种电器中扣式电池的充电(图 a).各限流电阻阻值,可依电池电流照下式计算R=V/(21)为精确把握充电时间,可在原电路中加接检测电路(图 b)。
In order to solve the problem of nowhere to buy a batch of old-fashioned electric measuring device button batteries such as “Yongnong 70-2 type”, the author designed a button-type zinc-mercury battery charging circuit. If several resistors are connected in parallel, a single-pole multi- The toggle switch (K) can be used to charge button batteries in various electronic appliances such as electronic watches, calculators, and photo cameras (figure a). Each current-limiting resistor can be calculated according to the following formula: R= V / (21) to accurately grasp the charging time, can be added in the original circuit detection circuit (Figure b).