Here's a simple latch-up circuit using 555 timer and opto-coupler MCT2E. You can also use.
All of us know that NE555(or other versions) is a versatile IC for building big.
Here's a simple light activated police siren using light dependent resistor and NE555 timer. Before.
This flasher circuit is bit different from other flasher circuits published on buildcircuit.com. (more…)