ARP 2500 |
module 1005 Amplifier |
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The 1005 incorporates both balanced modulator and voltage
controlled amplifier. If equal amplitude sine waves of frequency Fa and Fb
are routed to the audio inputs A and B the output will comprise of the sum
and difference tones (Fa+Fb)(Fa-Fb). harmonics are present in the applied
input A (Fa, 2Fa, 3Fa etc.)whilst the B input remains a plain sine wave Fb,
the resulting signal will contain the frequencies (Fa+Fb), Fa-Fb),
(2Fa+Fb), (2Fa -Fb), (3Fa+Fb0, (3Fa - Fb), and so on The two internal CV
sources can be used to modulate the oscillators feeding A and B. Both
ratio and initial frequency controls are provided.
Arp say: For convenience in live performance, the module contains circuits which produce two D,C. output control voltages (inharmonic preset control voltages) which may be used to detune oscillators supplying signals A and B when the unit is switched from the "Unmod" to the "Mod" operating mode so that the resultant modulated signal will have a pitch which is in a desired relationship to the unmodulated signals. The module also contains a voltage controlled amplifier which is identical to the one found in the 1006 FiltAmp. The output of the Balanced Modulator always passes through this amplifier. the ARP 1035 Triple Modulator offers balanced modulation without voltage controlled amplifiers included. The 1035 contains three blanked modulators and six microphone pre-amplifiers. |
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