论文部分内容阅读
二、电子锁控电路为了克服机械锁在人为打开机壳将锁开关用导线接通,即可打长途电话的弊病,可采用电子锁。一般人想打开电子锁控电路并非易事,需搞清钥匙的元件参数,提高了破锁的难度。图2为HA688(Ⅱ)P/TDL型电话机电子锁原理图,其中,LM339为四运算放大器,开锁工具是内部配置与R79、R80同阻值的插塞头,不同话机R79、R80的参数是不一致的,只有所配插塞头内阻R79′、R80′必须与R79、R80分别相等时才能打开锁“0”装置。
Second, the electronic lock control circuit In order to overcome the mechanical lock in the human open the lock switch will be connected with the wire, you can make the long-distance calls ills, the use of electronic locks. Most people want to open the electronic lock control circuit is not easy, you need to find the key components of the parameters to improve the difficulty of breaking the lock. Figure 2 is the HA688 (Ⅱ) P / TDL telephone electronic lock schematic diagram, of which, LM339 is a four operational amplifier, the unlocking tool is internally configured and R79, R80 plug with the same resistance, different phone R79, R80 parameters Is inconsistent, only with the plug head resistance R79 ’, R80’ must be equal to R79, R80, respectively, to open the lock “0” device.