Imagine your dad is old. Sure, he hears anything weak sound. How do you do? You are an electronics inventor, right? Yes, you can try to make a tool. To help him back to listen to great music again. This project is small, use only one 1.5V battery. Using normally components you can buy in stores near you.
This is a simple DC to AC Converter circuit,to converts 12VDC to 220VAC 50Hz/110V 60Hz as adjust frequency output using CD4047,MOSFET,power transistor and more
This is many LED flasher circuit and with PCB layout using transistors astable multi vibrator as low frequency oscillator below more...[...]
The 1.5v led flashlight circuit which also use single AA 1.5V battery. But few parts. Such as we use one transistor only. And all other parts of 5 pcs only [...]