Audio
signals as music or speech have big dynamic ranges. There are silent
and loud sections. These audio signals aren't too good for a
transmitter, which requires audio signal with constant level on the
input. Limiter is a device, which weakens loud signals and intensifies
silent signals.
On its output there is signal with constant
level. Signal clipping on the limiter output allows to increase the
signal level without exceeding maximum frequency deviation limit 75 kHz.
It's very suitable since preemphasis is used.
The limiter
circuitry features built in pre emphasis that can be set at 50uS, 75uS
or None. In the USA the setting should be 75uS and for the rest of the
world the setting should be 50uS.
The limiter compressor circuit
operates the audio gain around a fast attacking limiter in conjunction
with a gentle AGC. The limiter circuitry also includes selectable
pre-emphasis.
If your transmission chain does not include any
similar device, you should build this one. You will be surprised by its
quality, efficiency and simplicity. This is Compressor/Limiter/Clipper.
For STEREO you will need two boards
Supply voltage ---------------------- : 9-16 V
Quiescent supply current (12 V) -- : 15 mA
Output voltage ---------------------- : linear adjustable 0-3.5 V p-p (0-1,2 V rms)
Lower cut-off frequency (3 dB) --- : input: 25 Hz, output: <2 Hz
Upper cut-off frequency (3 dB) --- : 14,5 kHz
Min. input voltage ------------------ : 0.6 V p-p (0,2 V rms)
Input impedance ------------------- : 5000 ohm
Output impedance ----------------- : 500 ohm
Signal-to-noise ratio --------------- : >70 dB
® 2019 (c)
moutoulos ™
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