Vectronics VEC-820K - Manual (Page 19)

I . f . ('-820K Instruction Ilanual 01" Filter
THEORY OF OPERATION AND SPECIFICATIONS
Circuit Description:
The VEC-820K uses two UA747 operational amplifier integrated circuits to
form four low Q cascaded stages NNith no insertion loss. This results in a ven
narrow band« idth and extremely high skirt rejection with minimum audible
ringing. making good signal copying possible. The center frequency is
betNNeen 750-800 hertz. The filter is able to drive an 8 ohm speaker or
Specifications:
Bandwidth:.. .................................80 Hz, 110 Hz, 180 Hz (sNNitch
Skirt Re_jcolon:..................... ......... At least 60dB do%Nn 1 octave from
center frequency for 80 Hz. bandxN
ENCLOSURE
Vectronics has designed a matching enclosure just for your
CIF Audio Filler Kit. The matching enclosure is an all
includes knobs. hard
\\are. decals. and rubber feet. The
number for the matching enclosure is VFC-820KC.
VEC-820K Super
metal box which
Vectronics model