Kleiner Kurzwellenempfänger 3-12MHz (Einkreiser mit Rückkopplung, 3N211, BF256A, BF494)

The low frequency oscillators and noise generator described in this article are invaluable components in a synthesiser system. The LFOs allow amplitude and frequency modulation of the VCO outputs to provide tremolo, vibrato and other effects. The noise sources can be used for random modulation of the VCO signals, and in addition can be used as signal sources themselves.