Elektor Team (9536)

1-07-1981 | 63 fast TTL interface It is surprising how often TTL ICs are asked to perform a difficult (if not impossible) task. It is, of course, gratif...

1-07-1981 | 64 stereo level controls In a normal pre-amplifier, potentiometers are used for volume, balance and tone controls, but, because they carry s...

1-07-1981 | 7-62 — elektor july/august 1981 optical indication for the movement detector This circuit is intended as an extension to the movement dete...

1-07-1981 | ously. When a key is depressed, the output of IC2 remains logic zero until the counter reaches the corresponding address for that particular...

1-07-1981 | 7-64 — elektor july/august 1981 67 forget-me-not. _ transmitter Are you fed up with losing things, of putting valuables down and forgettin...

1-07-1981 | 68 forget-me-not - receiver The "forget-me-not" receiver is a TRF design and could hardly be simpler. It consists of a (cascode) RF amplifie...

1-07-1981 | B. Darnton humidifier A "mist propagation unit" maintains plant cuttings and newly sown seeds in a moist environment until rooting is effect...

1-07-1981 | M.A. Prins automatic soldertn iron switc VVe all know that it is quite easy to forget to turn off the soldering iron. If you then go out of...

1-07-1981 | R. Storn constant current adapter quite often the case that the electronics en- It is source. When thusiast requires a constant current for...

1-07-1981 | hydro-alarm It is well known that plant growers with a large "collection" have to work very hard in order to prois- and causes pin 13 duce s...