Ludwig Libertin (20)

1-07-2004 | A motorcycle or boat battery that is not needed over the winter is usually charged before being put away for the winter, after which it rema...

1-12-2003 | The author used to employ a switching central that allows mains appliances among his PC equipment to be individually switched on and off by...

1-12-2003 | Nowadays, a switch-off delay for the vehicle interior lighting is a naturally a standard feature. However, with certain models having only s...

1-12-2003 | This circuit produces a ringing sound similar to that made by more recent telephones. It consists of three almost identical oscillators conn...

1-07-2003 | The circuit presented here is a very simple and yet highly effective alarm system for protecting an object. The circuit requires no special...

1-07-2003 | In vehicles it is often required to have a powerful yet stabilised voltage that’s not affected in any way by fluctuations of the battery vol...

1-07-2003 | Using just two NAND or inverter gates its possible to build a D type (or ‘toggle’) flip-flop with a pushbutton input.At power-up the output...

1-07-2003 | Manufacturers of cordless drills generally recommend a battery charging time of three hours. Once the charging time is up the battery must b...

1-07-2003 | If a circuit is to switch a mains voltage, a relay is a simple solution in cases where switching times are long and high currents are involv...

1-07-2003 | The circuit described here can create three different ‘US-style’ siren sounds: police, ambulance and fire engine. The desired sound can be s...