Automatic control device circuit based on 555 circuit

The 555 Timer is a mid-scale integrated device that combines analog and digital functions. Generally known as 555, which is made by bipolar process, it is called 7555 in CMOS process. In addition to single timer, there is a corresponding dual timer 556/7556.555. The power supply voltage range is wide, which can be 4.5V~ Operating at 16V, the 7555 can operate from 3 to 18V with an output drive current of approximately 200mA, so its output is compatible with TTL, CMOS or analog circuit levels.
The 555 timer has low cost and reliable performance. It only needs several external resistors and capacitors to realize pulse generation and conversion circuits such as multivibrator, monostable trigger and Schmitt trigger. It is also widely used as a timer in instrumentation, household appliances, electronic measurement and automatic control.

Self-control device circuit diagram for EPROM erasing