Sound Lab Mini-Synth Mark II Parts List

Ray Wilson authored this content while he was actively running MFOS as the founder and resident genius.
We retain the content because it reflects a valuable point of view representing that time and place.

Article by Ray Wilson
This is an advanced project requiring understanding of electronics and electronic building and trouble shooting skills and equipment. Access to a good oscilloscope, DVM, bench power supply, soldering station and hand tools will be required. Only the schematic, circuit description, and suggested panel layout are provided. Please read over the entire project and make sure the information is clear enough for you to succeed before ordering PC boards or other products.

I sell several of the harder to find parts if you need them.

The unit will work with two plain old unmatched 2N3904 NPN transistors but the 1V/Octave tracking of the VCOs and VCF will be greatly diminished. The unit will work perfectly with three pairs of hand matched 2N3904 or 2N2222 NPN transistors.

Notes

Sound Lab Mini-Synth Mark II Parts List

Qty. Description Value Designators
2  LF442 or TL072 Dual Op Amp  LF442 or TL072  U3, U6  
1  LF444 Quad Op Amp  LF444  U16  
2  LM13700 Dual gm OpAmp  LM13700  U2, U14  
1  TL071 Op Amp  TL071  U12  
9  TL072 Dual Op Amp  TL072  U1, U4, U5, U7, U8, U9, U11, U13, U15  
1  TL074 Quad Op Amp  TL074  U10  
7  2N3904 NPN Transistor  2N3904  Q1, Q2, Q7, Q8, Q10, Q11, Q18  
3  For best VCO & VCF V/Oct tracking well
matched NPN pairs should be used for
Q1/Q2, Q7/Q8, Q10/Q11   		Matched NPN Pairs  Q1/Q2, Q7/Q8, Q10/Q11  
4  2N3906 PNP Transistor  2N3906  Q3, Q4, Q14, Q16  
1  For best VCF V/Oct tracking well
matched PNP pair should be used for
Q3/Q4   		Matched PNP Pair  Q3/Q4  
1  2N5172 NPN Transistor  2N5172  Q13  
3  2N5457 N Channel JFET  2N5457  Q15, Q17, Q19  
2  MPF102 N Channel JFET  MPF102  Q5, Q6  
2  PN4391 N Channel JFET  PN4391  Q9, Q12  
25  1N914 Diode  1N914  D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24, D25  
4  1N5231 5.1V Zener Diode  1N5231  Z1, Z2, Z3, Z4  
4  General Purpose LED  Red LED  LED3, LED2, LED1, LED4  
5  Audio Taper Potentiometer  100K  R158, R160, R163, R165, R196  
4  Audio Taper Potentiometer  1M  R126, R133, R148, R152  
17  Original Panel
Linear Taper Potentiometer  		100K  R1, R9, R13, R34, R37, R42, R67, R76, R81, R106, R134, R157, R176, R179, R185, R210, R217  
18  New 17" x 7" Panel
Linear Taper Potentiometer  		100K  R1, R9, R13, R34, R37, R42, R67, R76, R81, R106, R134, R157, R176, R179, R185, R210, R217, Attenuator Pot  
1  Linear Taper Potentiometer  10K  R19  
4  Linear Taper Potentiometer  1M  R139, R143, R209, R212  
2  Resistor 1/4 Watt 1%  18K  R74, R113  
2  Resistor 1/4 Watt 1%  1K  R71, R110  
6  Resistor 1/4 Watt 1%  1M  R41, R62, R66, R80, R101, R105  
4  Resistor 1/4 Watt 1%  20K  R50, R54, R89, R93  
2  Resistor 1/4 Watt 1%  3K  R57, R96  
2  Resistor 1/4 Watt 1%  9.1K  R39, R78  
1  Resistor 1/4 Watt 1%  49.9K  R33  
4  Resistor 1/4 Watt 1%  47K  R56, R63, R95, R102  
2  Resistor 1/4 Watt 1%  475 ohm  R53, R92  
2  Resistor 1/4 Watt 1%  4.7M  R48, R87  
4  Resistor 1/4 Watt 1%  4.7K  R44, R45, R83, R84  
2  Resistor 1/4 Watt 1%  39K  R36, R75  
2  Resistor 1/4 Watt 1%  36K  R38, R77  
2  Resistor 1/4 Watt 1%  3.3K  R47, R86  
5  Resistor 1/4 Watt 1%  2K  R16, R59, R98, R70, R109  
3  Ideally, if using matched pairs for
VCO and VCF R16, R59, R98 should be
2K +3300 ppm MF tempcos for best
1V/Octave tracking   		2K +3300 ppm tempco  R16, R59, R98  
2  Resistor 1/4 Watt 1%  22K  R51, R90  
2  Resistor 1/4 Watt 1%  1.2M  R60, R99  
14  Resistor 1/4 Watt 1%  100K  R52, R55, R58, R64, R68, R72, R73, R91, R94, R97, R103, R107, R111, R112  
8  Resistor 1/4 Watt 1%  10K  R46, R61, R65, R69, R85, R100, R104, R108  
2  Resistor 1/4 Watt 1%  110K  R40, R79  
1  Resistor 1/4 Watt 5%  4.7M  R35  
6  Resistor 1/4 Watt 5%  470K  R136, R142, R159, R161, R200, R206  
5  Resistor 1/4 Watt 5%  47K  R27, R30, R137, R154, R191  
3  Resistor 1/4 Watt 5%  5.1K  R214, R215, R216  
1  Resistor 1/4 Watt 5%  560K  R201  
1  Resistor 1/4 Watt 5%  6.2K  R190  
2  Resistor 1/4 Watt 5%  62K  R182, R183  
1  Resistor 1/4 Watt 5%  680K  R162  
2  Resistor 1/4 Watt 5%  91K  R124, R145  
1  Resistor 1/4 Watt 5%  9.1K  R168  
1  Resistor 1/4 Watt 5%  1.2M  R7  
20  Resistor 1/4 Watt 5%  100K  R3, R10, R11, R15, R21, R24, R119, R120, R135, R141, R171, R173, R189, R192, R197, R198, R199, R205, R207, R218  
17  Resistor 1/4 Watt 5%  10K  R8, R17, R18, R26, R29, R115, R125, R127, R140, R144, R146, R147, R166, R169, R184, R186, R203  
1  Resistor 1/4 Watt 5%  110K  R195  
1  Resistor 1/4 Watt 5%  130K  R175  
1  Resistor 1/4 Watt 5%  15K  R2  
6  Resistor 1/4 Watt 5%  1K  R22, R25, R121, R131, R151, R170  
7  Resistor 1/4 Watt 5%  1M  R114, R116, R117, R129, R138, R150, R155  
1  Resistor 1/4 Watt 5%  2.2K  R172  
4  Resistor 1/4 Watt 5%  200K  R128, R153, R164, R202  
5  Resistor 1/4 Watt 5%  220 ohm  R14, R23, R178, R193, R208  
2  Resistor 1/4 Watt 5%  22K  R20, R32  
1  Resistor 1/4 Watt 5%  270K  R174  
1  Resistor 1/4 Watt 5%  2K  R188  
1  Resistor 1/4 Watt 5%  3.9K  R167  
1  Resistor 1/4 Watt 5%  300K  R204  
2  Resistor 1/4 Watt 5%  30K  R130, R149  
1  Resistor 1/4 Watt 5%  33K  R6  
2  Resistor 1/4 Watt 5%  39K  R132, R156  
1  Resistor 1/4 Watt 5%  3K  R187  
1  Resistor 1/4 Watt 5%  3M  R177  
5  Resistor 1/4 Watt 5%  4.7K  R5, R28, R31, R194, R211  
3  Trim Pot Multi-turn  100 ohm  R12, R49, R88  
5  Trim Pot Multi-turn  100K  R4, R43, R82, R118, R123  
2  Capacitor Alum. Electrolytic  100uF  C76, C77  
8  Capacitor Alum. Electrolytic  10uF  C12, C15, C24, C27, C31, C43, C47, C74  
2  Capacitor Alum. Electrolytic  1uF  C70, C73  
2  Capacitor Alum. Electrolytic  4.7uF  C42, C46  
2  Capacitor Alum. Nonpolarized  10uF  C64, C65  
6  Capacitor Alum. Nonpolarized  1uF  C2, C34, C56, C57, C78, C79  
2  Capacitor Ceramic  .001uF  C17, C29  
2  Capacitor Ceramic  .0022uF  C41, C52  
2  Capacitor Ceramic  .022uF  C61, Optional LFO Timing Cap II  
6  Capacitor Ceramic  4.7pF  C7, C9, C19, C21, C35, C38  
1  Capacitor Ceramic  10pF  C60  
6  Capacitor Ceramic  100pF  C1, C8, C18, C20, C30, C71  
29  Capacitor Ceramic  .1uF  C5, C6, C11, C13, C14, C16, C23, C25, C26, C28, C32, C33, C36, C37, C44, C45, C48, C49, C53, C54, C58, C59, C62, C63, C66, C67, C69, C72, C75  
3  Capacitor Polystyrene Radial Leads  .005uF  C10, C22, C68  
2  Capacitor Silver Mica or Polyethylene  330pF  C3, C4  
2  Capacitor Tantalum  1uF  C39, C50  
2  Capacitor Tantalum  10uF  C40, C51  
1  Original Panel
Switch DPDT  		DPDT  S17  
1  New 17" x 7" Panel
Switch 3PDT  		3PDT  S17  
2  Switch DPST  DPST  S9, S14  
3  Switch SPDT  SPDT  S1, S6, S7  
8  Original Panel
Switch SPDT (Center Off)  		SPDT (On-Off-On)  S2, S3, S4, S5, S11, S12, S16, S19  
1  New 17" x 7" Panel
Switch DPDT - Center Off  		DPDT (On-Off-On)  S16  
7  New 17" x 7" Panel
Switch SPDT (Center Off)  		SPDT (On-Off-On)  S2, S3, S4, S5, S11, S12, S19  
6  Switch SPST  SPST  S10, S13, S18, S20, S21, S22  
2  Switch SPST N.O. Push Button  SPST  S8, S15  
4  Jack 1/4" 2 Terminal  Phone Jack  J1, J2, J3, J4  
13  Original Panel
Banana Jacks  		Banana Jacks  8 of one color (inputs) 5 of the other (outputs)  
22  New 17" x 7" Panel
Banana Jacks  		Banana Jacks  11 of one color (inputs) 11 of the other (outputs)  
        
31  Original Panel
Control Knobs  		Knobs  Get the knobs that fit your pots.  
32  New 17" x 7" Panel
Control Knobs  		Knobs  Get the knobs that fit your pots.  

Miscellaneous