| 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...
Elektor Team (8188)
| B. Darnton humidifier A "mist propagation unit" maintains plant cuttings and newly sown seeds in a moist environment until rooting is effect...
| 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...
| R. Storn constant current adapter quite often the case that the electronics en- It is source. When thusiast requires a constant current for...
| 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...
| automatic reset ulse This circuit is designed to generate a reset p whenever the supply voltage is switched on and, in addition, whenever th...
| ED voltage monitor A stable power supply is absolutely essential for the correct operation of computers and TTL circuits. A voltage fluctuat...
| Ext. Trig. Word Rec. Ext. Trig. 5V •o 4 76consists of two four bit binary comparators, IC1 word recogniser and delayed trigger Many oscill...
| 7-72 — elektor July/august 1981 1 14 C8 10 ,L :16 V• Tent. 31 to Ilk i4 humidity 7 Encouraged by the enormous response to the publicatio...
| (al crysta • voltage supplies It is very easy to construct a crystal oscillator using a field effect transistor. This particular circuit o...