Download Print this page

Paia 9710 Assembly And Using Manual

Triple vca w/modulator

Advertisement

Quick Links

Triple VCA w/Modulator
Model 9710
Assembly and Using Manual
Ordinarily, Voltage Controlled Amplifiers are pretty
routine. But by combining 2 VCAs, a Balanced
Modulator, a White Noise Source and Envelope
Generator in a single module and interconnecting
them with a powerful normalization design, the 9710
redefines what a VCA module should be.
At the highest level, you can use the 9710 like a
traditional VCA but with the added convenience of a
built-in Voltage Controlled Input Submixer and ADSR
Envelope Generator. This configuration of elements
allows a couple of signals to be mixed together
before being processed by the VCA which is con-
trolled by the ADSR. It would ordinarily require three
or four modules and a handful of patch cords but is
embodied as a single element in the 9710.
And the versatility of individual modules is not
sacrificed because patch cords can be used to
override the normalization and access progressively
lower level functional sub-groups or even the indi-
vidual elements.
(c) 2000 PAiA Electronics, Inc.
000216
9710 VCA
1

Advertisement

loading
Need help?

Need help?

Do you have a question about the 9710 and is the answer not in the manual?

Questions and answers

Summary of Contents for Paia 9710

  • Page 1 9710 redefines what a VCA module should be. At the highest level, you can use the 9710 like a traditional VCA but with the added convenience of a built-in Voltage Controlled Input Submixer and ADSR Envelope Generator.
  • Page 2 Supplement in the center of this manual. These pages may be removed for easy reference during assembly. THE CIRCUIT BOARD The 9710 VCA is built on a double-sided circuit board. No special preparation or cleaning is necessary before assembly. The "top" of the board is the side that is printed with component designations and parts are mounted from this side.
  • Page 3 Accidental bridges can be cleaned off by holding the board upside down and flowing the excess solder off onto a clean, hot soldering iron. Use care when mounting all components. Never force a component into place. 000216 9710 VCA...
  • Page 4 ( ) R3 ( ) R6 ( ) R7 ( ) R10 ( ) R19 ( ) R76 ( ) R15 1500 brown-green-red ( ) R18 1500 brown-green-red ( ) R41 brown-green-orange ( ) R42 brown-green-orange 000216 9710 VCA...
  • Page 5 47k yellow-violet-orange ( ) R31 ( ) R49 ( ) R54 ( ) R56 ( ) R57 ( ) R59 ( ) R90 ( ) R101 ( ) R106 ( ) R119 ( ) R120 000216 9710 VCA...
  • Page 6 ( ) C3 ( ) C5 ( ) C7 ( ) C9 ( ) C10 ( ) C13 ( ) C17 listed below: 100pF ( ) C8 ( ) C11 ( ) C12 ( ) C14 ( ) C15 000216 9710 VCA...
  • Page 7 DESIGNATION TYPE listed below: 1N4148 Silicon Diode ( ) D1 ( ) D2 ( ) D3 ( ) D4 ( ) D5 ( ) D6 ( ) D7 000216 9710 VCA...
  • Page 8 First "tin" the trimmer mounting pads on the circuit boar by melting a little solder onto them. Solder the trimmer to the board by holding the pins against the tinned pads and remelting the solder. 000216 9710 VCA...
  • Page 9 Finally, solder the remaining connections. DESIGNATION PART NO. DESCRIPTION ( ) IC3 LM324 Quad OpAmp ( ) IC4 LM1496 Balanced Modulator ( ) IC5 LM13600 Dual OTA ( ) IC6 LM324 Quad OpAmp ( ) IC7 LM324 Quad OpAmp 000216 9710 VCA...
  • Page 10 Solder each connection as it is made and clip any excess wire from the solder side of the board. 000216 9710 VCA...
  • Page 11 ( ) "AB" 5" This completes assembly of the 9710 circuit board. Admire your work for a few minutes then take a break. When you come back, admire your work again but this time be critical. It would be a good time to double check the orientation of polarized parts and that the right resistors and capacitors are in the right places.
  • Page 12 Now we’ll continue wiring of the front panel parts as shown in fig 3. First, notice that Individual solder lugs are identified by part number and lug number. For example, R109-1 means the lug labeled “1” of the Potentiometer R109. 000216 9710 VCA...
  • Page 13 R112-3 (ns) ( ) 3-1/2" R112-3 (s2) R113-3 (ns) ( ) clipping R113-3 (s2) R113-2 (ns) The resistors not used during circuit board assembly will now mount directly on the lugs of the controls (see fig 3). 000216 9710 VCA...
  • Page 14 FROM FROM ( ) "U" R110-1 (s1) Fig 4 ( ) "Z" R112-1 (s1) Fig 4 Fig 4 Fig 4 ( ) "F" J10-T (s1) ( ) "T" J11-T (s2) ( ) "I" J13-T (s1) Fig 5 000216 9710 VCA...
  • Page 15 J3-R (s2) ( ) "S" J2-T (s1) ( ) "Y" J4-X (s1) ( ) "V" J3-T (s1) ( ) "B" J5-X (s1) ( ) "E" J4-T (s1) ( ) "L" J6-R (s1) ( ) "H" J5-T (s1) 000216 9710 VCA...
  • Page 16 (note the polarizing tabs on the connector body) and check to make sure there are no stray wire strands before soldering in place. Clip off any excess on the solder side of the board. 000216 9710 VCA...
  • Page 17 No signal inputs or outputs are needed for these first tests. 1) Set the 9710 knobs and switch as shown and turn on power. First observe the POWER light on the power supply and if it doesn't come on stop and find out why.
  • Page 18 4) Disconnect the amp from the L+R output and listen to the A output. You should hear the noise/tone mix being modulated in volume following the changes in the ADSR output. An equal mix of noise and pitched source modulated by a fast attack and somewhat slower Release should sound like a snare drum. 000216 9710 VCA...
  • Page 19 ( ) Gather the wires from the circuit board to the front panelcontrols together and cinch the bundle with the three Nylon Wire Ties supplied as shown in the photo. Cinch the ties tight and clip off the excess. 000216 9710 VCA...
  • Page 20 -6dBV relative to either of the direct outputs or the nominal peak A VCA output. A output. The output of the A VCA. Like most VCAs the 9710 sections are actually attenuators that have unity gain when CVs are their nominal max (10V).
  • Page 21 0V output. Time is variable from 2mS (CCW) to about 7 seconds (CW). ADSR - Cycle. When set to Cycle the ADSR self-triggers for an LFO function. The block diagram shows general signal flow and other details of the normalization design. 000216 9710 VCA...
  • Page 22 When the Gate goes low, Q8 can turn off so the Q8/Q9 bistable is reset. When Q8's collector voltage goes high it turns on Q11 and consequently C16 continues discharging from the Sustain voltage at a rate set by the Release control R113 until it is fully discharged or the Gate once again goes high. 000216 9710 VCA...
  • Page 23 Balanced Modulator operation. NOISE The 9710 Noise source uses the common approach of reverse-biasing the emitter-base junction of transistor to the point of break-over and amplifying the white noise that results from avalanching. The transistor that supplies the noise is Q5 with Q6 and Q7 configured as a two stage discrete amplifier.
  • Page 24 9710 Parts List Misc Semiconductors 7912 7812 SPST Min Toggle Switch 1N4148 Diodes D1,D2,D3,D4,D5, 9710 Circuit Board D6,D7 Assembly Manual Set Screw Knobs Red LED LED1 5' lengths #22 stranded LM13600 Dual OTA 18 inch length small bare wire LM1496 Bal. Mod...