| single IC siren a physical sense. This particular siren is very simple and easy to cin- struct since it is built around a single IC, the LM...
More about oscillator (484)
| N1 49 pulse generator with variable duty-cycle single 4093 CMOS IC is eminently suitable for constructing a simple pulse generator. The IC c...
| • r long-pertod time This monostable multivibrator can be seen as a long-period alternative for timer circuits which incorporate the well-...
| 55 novel flashing light As you may have already guessed, this circuit ess than a method of illumi- By altering the pin numbering a totally "...
| 7-54 — elektor july/august 1981 "1rli-fi" siren The title "siren" above a circuit diagram usually implies a circuit for a two-tone or mult...
| ously. When a key is depressed, the output of IC2 remains logic zero until the counter reaches the corresponding address for that particular...
| 7-64 — elektor july/august 1981 67 forget-me-not. _ transmitter Are you fed up with losing things, of putting valuables down and forgettin...
| 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...
| 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...
| 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...