Development of a calibrated sound level indicator

Τίτλος

Development of a calibrated sound level indicator

Θέμα

Sound--Equipment and supplies

Sound--Measurement

Δημιουργός

Lyssiotis, Paul

Πηγή

Higher Technical Institute

Το πλήρες κείμενο είναι διαθέσιμο από το Υπουργείο Ενέργειας, Εμπορίου Βιομηχανίας και Τουρισμού

Εκδότης

Library of Cyprus University of Technology

Ημερομηνία

1993

Συνεισφέρων

Spyrou, Spyros

Δικαιώματα

Απαγορεύεται η δημοσίευση ή αναπαραγωγή, ηλεκτρονική ή άλλη χωρίς τη γραπτή συγκατάθεση του δημιουργού και κάτοχου των πνευματικών δικαιωμάτων.

Μορφή

pdf

Γλώσσα

eng

Τύπος

text

Αναγνωριστικό

EED0250

Σύνοψη

The purpose of this project was to design, construct and test a circuit to indicate the various sound levels of an audio signal.
The objectives of this project were:
1. To investigate the properties of sound, microphones and relevant sound transducers.
2. To investigate pre-and calibrated main amplifier electronic circuit.
3. To investigate suitable displays.
The circuit operated in the following way :
The audio dependend signal was fed directly to the input tenninals of the preamplifier and then it was amplified in an amplifying circuit. After a full wave rectification the direct-audio depended signal was fed into the non-inverting inputs of eight comparators comparing this voltage to fixed values. When a comparator was activated the transistor whose base was connected to the output
of the op-amp was switched ON, thus an LED was ON indicating a sound level.