All Electronics Hobby Projects. You can build quickly them when have free times. Most cheap and easy to find parts.
This is the cheap fire alarm circuit that Use principle of infrared sensor smoke. When cause events fire. The principle is simple and affordable.
This is complete stereo amplifier circuit 60W +60 W without customize. Which is easy to build , sound quality, and cheap because the LM3876 works perfect. [...]
Power bank mobile charger circuit using LM1086
Power bank mobile charger circuit project to backup energy when use portable mobile no electrical outlet. Use LM1086 as main on low dropout voltage. [...]
The project is the NiMH battery charger circuit on automatically shut off when fully charged. Can charge batteries 1-10 pcs. Depending on the input voltage [...]
This is 60W RMS OTL integrated audio amplifier circuit using 2N3055 and normal transistor so cheap and can build easily and It's durable and very loud sound [...]
The integrated amplifier that is smaller. For listening in a small room. Must have good the sound quality. Low noise and cheap.
This is digital temperature meter circuit that has High the accuracy temperature measurement. it use ICL7107 for LED 7 segment display and LM335 or LM135