Paia 9720 Assembly And Using Manual Download Page 6

6      9720 VCO

010321

DESIGNATION    VALUE COLOR CODE A-B-C

listed below: 5600

green-blue-red

(  ) R36

(  ) R37

(  ) R64

(  ) R82

listed below: 56k

green-blue-orange

(  ) R20

(  ) R23

(  ) R44

(  ) R48

(  ) R71

(  ) R93

(  ) R29

750

violet-green-brown

(  ) R98

82k

grey-red-orange

(  ) R101

82k

grey-red-orange

listed below 91k

white-brown-orange

(  )R8

(  ) R59

(  ) R80

(  ) R103

1% FILM RESISTORS

The 1% metal film resistors are identified by their 5 color bands.

DESIGNATION    VALUE COLOR CODE A-B-C-D

listed below: 100k 1%

brown-black-black-orange

(  ) R14

(  ) R16

(  ) R40

(  ) R42

Disk and Polystyrene Capacitors

Many of the capacitors used in the 9720 are nonpolarized

Ceramic Disk and Polystyrene types. For each of these,
either lead can go in either of the holes in the circuit board.
The leads of the Ceramic Disk capacitors are already parallel

to each other but still may need to be bent slightly to match
the spacing of the circuit board holes.  The leads of the
Polystyrene capacitors will need to bend down prior to installation

and may be further apart than the spacing of the circuit board holes.
Like the resistors, insert the leads of these parts through the holes
in the board and push the part against the circuit board as far as

it wants to go.  Don't force it, it's OK if it sits a little off the board.

Capacitors are often marked with obscure codes that

indicate their values. The 3 digit number that specifies
value may be preceded or followed by letters indicating
such things as tolerance. If you get confused about

which capacitors are which, it may help to group them
by same type and check them against quantities on the
packing list at the end of this manual.

1% Resistors have

5 color bands

Summary of Contents for 9720

Page 1: ...tch over a 3 octave range The Sync input provides for Soft Synchronization to an external audio source Oscillator B is very similar to Osc A but subtle differences optimize the flexibility of the pair...

Page 2: ...silly and ritualistic but it greatly decreases the chance of omitting a step and also provides some gratification and reward as each step is completed Numbered figures are printed in the Illustration...

Page 3: ...ver the soldering pad and about 1 16 inch of lead passing through it There are two improper connections to beware of Using too little solder will sometimes result in a connection which appears to be s...

Page 4: ...in later steps The 9720 VCO uses 1 film resistors in precision circuitry and 5 carbon film resistors in non critical locations Not all resistors are mounted on the circuit board some will be left ove...

Page 5: ...brown R24 R46 R50 R88 listed below 2200 red red red R13 R15 R22 R32 R65 R74 R83 R84 R100 220k red red yellow R102 220k red red yellow R106 220k red red yellow R25 2400 red yellow red R52 2400 red yell...

Page 6: ...mic Disk capacitors are already parallel to each other but still may need to be bent slightly to match the spacing of the circuit board holes The leads of the Polystyrene capacitors will need to bend...

Page 7: ...capacitors are polarized and the leads are not interchangeable Leads are marked and or and the lead must go through the hole in the circuit board Frequently the positive lead of the capacitor is sign...

Page 8: ...hem in the circuit board Note that the transistors are polarized by the flat side of the case When the transistors are properly installed this flat will align with the corresponding mark on the circui...

Page 9: ...before assembly or if you do touch a lamp or something to make sure you re discharged Don t be intimidated It s rare for parts to be damaged this way ICs are polarized in one or both of two ways A do...

Page 10: ...is flat will align with the corresponding flat in the LED symbol printed on the circuit board When the 9730 is installed behind its front panel the LED will engage the holes in the front panel and be...

Page 11: ...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 Examine the solder joints On t...

Page 12: ...ing the S lugs of J12 J16 to the wire by bending them up until they touch the wire then soldering the two together DO NOT SOLDER the connection at J18 Using the flat washers and nuts supplied mount th...

Page 13: ...nd crimp it back to mechanically secure it Connect the free end of the solid wire extending beyond J11 S to R203 1 ns Cut a 3 3 4 length of bare wire and pass it through the holes in the S lugs of J1...

Page 14: ...lied and slip one over each resistor lead Trim the leads so that 1 4 extends beyond the sleeving Use this part as R207 to make the connection from R200 1 s1 to R201 1 ns Similarly insulate the leads o...

Page 15: ...t engages the hole provided for it in the front panel as shown in fig 2 Attach the circuit board to the front panel by passing 4 40 X 1 4 Machine Screws through the panel from the front and into the t...

Page 16: ...more solder Allow the joint to cool and test it by wiggling the wire to make sure the joint is firm Do not wrap the wings of the pin around the wire Slide the power pins into the connector body Note...

Page 17: ...about something else for a while When you come back take the time to do a final check The flying wires to the panel aren t bundled with wire ties yet and we ll leave them that way for now so move them...

Page 18: ...different half or twice more for instance it may indicate an incorrect component value or power supply lines that are out of spec check for hot parts among the power supply components mentioned in ste...

Page 19: ...ator out to OscA PW input and listen to observe PWM effect Notice that the output is silent for a part of each cycle when the Output control is CW beyond the 12 o clock position Problems with these te...

Page 20: ...ustration With 4V output from the controller adjust OscB pitch for 2 octaves above OscA then with 0V output adjust Scale B trimmer R52 for a pitch 2 octaves below OscA Iterate this procedure until sat...

Page 21: ...a second reading more things will make sense and on a third even more Be sensitive to how different sections of ICs are used For example notice that both the OscA Ramp and OscB Pulse outputs use secti...

Page 22: ...s that define ramp triangle and pulse waveforms OscB Pitch CV Input 1 The arrow indicates that this input is normalized to the output of the glide processor and consequently OscA P1 Inserting a plug i...

Page 23: ...he output high Periodic Trigger pulses hard sync the LFO Output Amplitude of the Control Voltage from this output is set by the Output control The arrow indicates that the Modulator Output is normaliz...

Page 24: ...shaper that has opamp IC8 B as it s active element As the ramp increases toward ground from its minimum of 6 5V diodes D15 and D16 are both reverse biased and the opamp acts as a unity gain inverter...

Page 25: ...of that voltage Taking OscA as typical the voltage across the b e junction of Q3 produces a collector current that is exponentially related to voltage increases When properly calibrated collector cur...

Page 26: ...hich couples to the buffered timing capacitor voltage and the positive feedback resistor network R100 R106 These values are chosen so that when the timing voltage reaches 10V the voltage at the input...

Page 27: ...9720 VCO 27 010321...

Page 28: ...60 4 18k brown grey orange R4 R11 R81 R86 2 1k brown black red R31 R57 1 22 red red black R1 4 220 red red brown R24 R46 R50 R88 8 2200 red red red R13 R15 R22 R32 R65 R74 R83 R84 3 220k red red yello...

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