More about technology (449)

1-12-1991 | The power supply for this analogue circuit that affords delays of 330 seconds is taken directly from the mains. The direct voltage at the...

1-12-1991 | Binary-coded-decimal (thumb-wheel) switches are not only relatively expensive, but are also often not available to the wanted specificati...

1-12-1991 | The wide frequency range, low power consumption and well-defined switching levels of HCMOS inverters make these devices emlnently suited t...

1-12-1991 | Rectifying the buzzer signal on a telephone line results in a voltage that may be used to switch one or more loads, for instance, a light...

1-12-1991 | This circuit has been designed primarily for use with valve amplifiers. When the arnplifier is switched on, filament voltage is supplied...

1-12-1991 | Some video cameras have a socket for a remote control unit. It appears, however that it is not always easy to connect an interval-contral...

1-12-1991 | A problem with standard logic as implemented in the 7400 series of integrated circuits is that, since the approach is functional, there i...

1-12-1991 | A type TL081 opamp and same passive components are sufficient to construct a small amplifier whose amplification can be varied between +...

1-12-1991 | Since there are still tape recorders about that have no mechanical tape counter, the circuit shown here offers an excellent, electronic a...

1-12-1991 | Switching transistors are usually driven into saturation. which has an adverse effeet on the switching speed. This effect is eliminated,o...