Elektor Team (9512)

1-07-1984 | july/august 1984 big brother is watching you . . . This monitor circuit is based on the MC 3424 power supply supervisory IC. It provides two...

1-07-1984 | // the ratio of R2 + R3 + P1 to R3 + P1. The input impedance, which, at 1 M, is quite high, is de- fined by R1 as the op-amp has FET inputs....

1-07-1984 | maintains the set value la Touch-pad keys normally use a simple digital memory, but they can be operated to give an analogue out- put voltag...

1-07-1984 | . for sleepy drivers radio can be switched on and off via a relay contact. Switch on the supply; the display should then flash. Setting the...

1-07-1984 | a tried and tested formula Most light dimmers that are available in the usual electrical goods shops can only handle a fairly small power. A...

1-07-1984 | with moving-coil instrument An LC meter is undoubtedly in- dispensable to anyone involved in h.f. techniques. The present design accepts the...

1-07-1984 | to help your guests This circuit should put an end to your guests fumbling for the light switch in the cloakroom. It ensures automatically t...

1-07-1984 | . . . . for cassette interface Compact cassettes, because of their low cost and easy availability, have been the mainstay memory in per- son...

1-07-1984 | how to double your ROM memory capacity The 2708 EPROM has become vir- tually obsolete, and with good reason. It needs three supply voltages...

1-07-1984 | july/august 1984 transmits serial computer information In general the normal connections between a computer and its peripherals are very eff...