synare6 bmp
FILTER. CONTROL.
Testing. (continued)
and to see if the fUter responds properly to its contro! voltages.
To use the fil ter as an oscillator the selector switches should be off and the resonance turned up ful 1.
The fil ter has three panel Controls that effect fil ter tuning - filter tune, filter Osc 2 (appli-cation of triangle wave), and filter sweep (filter envelope).
The filter tune control is capable of moving the filter from 30Hz to 4KHz. The bottom end (30Hz) is adjusted at the factory by selećting a resistor that normally ranges from 2 to 3 megs.
The filter's Osc 2 control adds frequency modu-lation or vibrato to the filter. The speed of modulation is determined by Osc 2's tune control. and selector switch.
The sweep control causes the filter pitch to instantly jump up on a pad strike and then to g1 i de back down. The time of the.gli de is set by the fil ter's decay control.
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Problems.in this area are usually caused by faul ty pots.
AMPLIFIERS.
Description. The voltage controlled $niplifier consists of a transconductance amplifier (3080) used as a two quadrant mul tipiier. Its audio input comes from the filter and its control input is the combipation of the outputs of two envelope generators. The output of the 3080 drives the volume pot and the output Jack,
Voltage Control led Amplifier Testing. The output of the amplifier may be con^ veniently tested at the volume pot or output jack. There is rarely a problem with the 3080$. In generał, suspect the enyelope generators.
ENVEL0PE GENERATORS.
Description. There are three envelopes in Synare 3. The envelopes are initiated by a strike on the płaying pad. The output o-f the speaker amplifier in the b.s.c. is applied to three 04s each conneętedin an emitter follower configuration with large capacitors in their emitters.
The strike charges each capacitor to thfe base yoltage. (The base voltage'is proportional to
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