Elektor Team (9512)

1-07-1984 | with one push-button The present circuit is particularly useful where two families share one house, and where therefore two doorbells are a...

1-07-1984 | and —15 volts at 2 amps There is often a need for a high- power no-nonsense supply for a cir- cuit with a large number of op-amps and othe...

1-07-1984 | for control computers The use of a microprocessor system as control computer often makes it necessary for a large number of analog signals t...

1-07-1984 | extends their usefulness The well-known CMOS IC type 4017 is a decade counter which offers an excellent means of sequentially scan- ning sma...

1-07-1984 | for testing digital circuits This design is a somewhat unusual test aid for digital circuits. Most such circuits are usually tested in a sta...

1-07-1984 | switches itself on (and off) This circuit forms a switch that can be triggered on (or off) at the onset of darkness and remain active for a...

1-07-1984 | humane solution to an old problem This mousetrap is not intended to kill a mouse with the aid of electronics, but rather to imprison it in a...

1-07-1984 | july/august 1984 react at the speed of light The human eye has a certain "built- in" delay. This fact is used for films, TV sets, and fluore...

1-07-1984 | for keeping nasty rodents at bay Most of us will agree that rats and mice are generally not the most welcome visitors to our homes. At the s...

1-07-1984 | motion study by flash-light WARNING! The circuit of the stroboscope is connected directly to the mains and experiments on the opened unit ar...