A previous Design Idea describes an astable multivibrator that gets hysteresis from the positive feedback stage using a technique you can characterize as positive-capacitive feedback (Reference 1). It ...

A free-running generator built on the standard configuration of the 555 timer can't provide a duty cycle of exactly 50%. That's a well-known fact. Fortunately, there are several ways to get around ...

Bicycle-powered generators aren't new concepts by any stretch, but they frequently generate AC power and sometimes can't charge at all when the pedaling stops. Siva Cycle doesn't think either ...

It seems that no matter how new your smartphone is, battery life is never efficient. After all, when your phone is filled with features and apps, it’s hard to not use them all day long, but strapping ...