Bill of Material from SPVCO_Main_1.6.sch, 108 parts, as of 8/12/2010 9:45:06 PM Value Qty Part 0.01u 1 C1 390p 1 C2 C2 should to be polystyrene or other temperature stable, low leakage capacitor 470p 1 C3 LM741 4 IC1, IC2, IC3, IC4 PWR 1 J1 Pulse 1 J2 VC Wid 1 J3 Sync 1 J4 VC1 1 J5 VC2 1 J6 VC3 1 J7 Saw 1 J8 Tri 1 J9 Sin 1 J10 2N5172 8 Q1, Q2, Q9, Q10, Q11, Q12, Q14, Q16 PN5138 5 Q3*, Q4, Q8, Q13, Q15 2N5246 1 Q5 THAT340 1 Q6* SSM2210 2 Q7*, Q17* R1, R3, R8, and R14 can be 0.1%, low temp coefficient to get best tracking and stability ie: RN55E series 22k 9 R1, R18, R29, R34, R41, R59, R60, R64, R72 2.2k 11 R2, R4, R6, R9, R12, R16, R19, R30, R50, R68, R69 3.9k 1 R3 1k 1 R5 68 2 R7, R32 8.2k 3 R8, R14, R56 390 1 R10 220 1 R11 100 1 R15 180k 3 R17, R62, R73 33k 1 R21 100k 4 R22, R37, R38, R70 R37 and R38 should be matched/purchased to 0.1% to give the best scale matching between VC1 and VC2 1.2k 1 R24 47k 5 R26, R27, R48, R57, R61 4.7k 1 R31 10k 1 R66 30k 1 R35 75k 1 R45 2.2M 1 R46 120k 1 R49 Panel Pots, linear taper 25k Pul Lev 1 R20 25k Pul W 1 R25 25k Freq 1 R47 25k Fine 1 R51 25k Saw Lev 1 R53 25k Tri Lev 1 R54 25k Sin Lev 1 R65 These next three resistors are optional and user selectable You can first choose to have an adjustable VC3 input. If you choose this, then you need to choose to put the trimmer on the panel or on the PCB. On the panel, you can use a regular potentiometer, or a 3/4 inch trimmer on the panel trimmer chiclet. Then you need to pick values to give you the variability you want. A 22k fixed for R42 and a 200k for R43 or R40 is a good start. If you want a fixed, use a matched 100k or other value that gives a fized scale you want. VC3 Scale 1 R42 fixed resistor VC3 Scale 1 R43 Trimmer/pot VC3 Scale 1 R40 Trimmer/pot V/Oct trimmer: Use one or the other of the following trimmers, NOT BOTH. For a panel mount trim for the V/Oct, use R33 which should be a panel mount trimmer, not a single turn potentiometer. For PCB trim, use R36 which should be a Bournes 3296Y series to fit the pads. 25k V/Oct 1 R33 25k V/Oct 1 R36 For the panel mount trimmers, I recommend the following part available at Mouser http://www.mouser.com/Search/ProductDetail.aspx?R=H-83Pvirtualkey65210000virtualkey652-H83P It’s a Bourns #H-83P adapter. It takes the 3005/3006 series multi-turn trimmers. It will probably accept any standard ¾ inch long multi-turn trimmer. Trimmers: Pad layout fits a Bourns 3296Y series 50k Freq Range 1 R52 25k Saw DC 1 R44 5k Min Wid 1 R23 5k Max Wid 1 R28 5k Phase Sync 1 R39 5k Tri DC 1 R55 5k Tri Shape 2 R58, R67 5k Sin Shape 1 R63 5k Sin Shape Bias 1 R71 5k Sin DC 1 R74 1k Tempco 1 R13 * Note, there are three paired NPN transistors in the VCO. The "exponential pair" in the core Q6 really must have the Vbe matched. This pair can be part of the THAT340, SSM2210, LS319, LM394, Analog Devices MAT12, etc. The other pairs, Q7 and Q17 don't necessarily have to be matched. I think that two unmatched NPNs should work fine. If you use a THAT340, it has a PNP in it which will become Q3. So, don't install Q3 if you use a THAT340. Q6 (conisdered the entire pair) must be in thermal/mechanical contact with Q3 and R13.