The measurement of signals of low frequency is enough difficult in enough cases. Most meters of frequency have specifications, for measurement of frequency until 50 HZ or 100HZ and the depiction, if they are drive with signals of low frequency, it does not have no precision. - > TRANSLATION : Η μέτρηση σημάτων χαμηλής συχνότητας είναι αρκετά δύσκολη σε αρκετές περιπτώσεις. Οι περισσότεροι μετρητές συχνότητας έχουν προδιαγραφές, για μέτρηση συχνότητας έως 50 ή 100ΗΖ και η απεικόνιση ,εάν οδηγηθούν με σήματα χαμηλής συχνότητας



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Note added at 1 hr 53 mins (2004-02-02 19:40:03 GMT)
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\"For the first time in an audio amplifier, portions of the positive and negative DC voltages in the main power supply are siphoned off and used to drive a special oscillator that generates a pure 60 Hz sine wave. \" Edo exei tin ennoia pali tou odigo, pρootho.

Des kai apo Webster gia to drive :
Drive \\\"drïv\\ verb
Verb transitive
1 a: to impart a forward motion to by physical force
b: to set or keep in motion or operation
2 to operate the mechanism and controls and direct the course of (as a vehicle)
Verb intransitive
1 to progress with strong momentum
1 The means for giving motion to a machine or machine part


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Note added at 2 hrs 0 min (2004-02-02 19:47:13 GMT)
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Αν πάλι μιλάς καθαρά για συχνότητες, σήματα κτλ δες www.geocities.com/jkostaras/sst.html