| In November 1976 the circuit was described of an ultrasonic intruder alarm, the `Al bar`. By slightly mis-using the ultrasonic transduc...
| In November 1976 the circuit was described of an ultrasonic intruder alarm, the `Al bar`. By slightly mis-using the ultrasonic transduc...
| Klopfgeist (Ultraschall-Sender, US-Empfänger lösen Klopfgenerator aus)
| Brutkasten (Schaltungsidee) (durch Hören hoher Töne (>8 kHz) Gehirn-Gleichgewicht herstellen)
| The first part of this article dealt with the general operating principles of the morse decoder. In this part the complete circuit is co...
| Mikrocomputer - Eine Einführung (Grundlagen)
| LED-Aussteuerungsmesser (Audio, `diskret`, mit OPV)
| Readers may remember that the `Discolights` featured in Elektor September 1975 used TTL shift registers to drive triac switches. This is...
| Albar-Version 2 (Ultraschall-Alarmanlage)