1590BB2 · 4 knobs
Sputnik II/III
Based on the Spaceman Effects Sputnik II· 3 other boards clone it
Want a PCB? Naegele Audio laid out a PCB for this circuit and sells boards, as well as relay bypass and I/O boards: message PedalBuilder on the PedalPCB forum.
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From the vendor
About a year ago, after lurking in the Bring out yer Diptrace thread , I decided to dabble in making my own PCBs for circuits that Robert was not offering for sale. Many boards later, I decided to take the plunge and try cloning the Spaceman Sputnik II/III. It took quite a bit of on and off again work over about six months, but I'm happy to say that it worked! I had always been intrigued by the Spaceman Sputnik family of fuzzes, but was a little put off by the side-mounted jacks (and a few other minor things), so it seemed like a good candidate for a DIY build. I initially considered buying a PCB, but after an unpleasant experience building a Gemini IV clone on a commercial PCB that did not seem to be designed to fit in an enclosure that also had jacks, I decided to go it alone and do the PCB myself. Before I began, I breadboarded the circuit and checked: (1) whether I liked the circuit enough to go to the effort of building one; (2) if yes, whether I wanted the low filter control from the Sputnik II or just the high filter control from the Sputnik III; (3) whether I wanted the diode reverse switch from the DeadEndFX's Laika; and (4) what transistors I would use. I quickly decided that I loved the circuit, the low filter switch was a must-have, and I did not like the diode reverse switch. I tried a four different low leakage, mid-gain Soviet transistors: GT308V, GT309B, GT310B, and P416B. To my knowledge, the current Spaceman Sputnik III uses the GT308V and P416B, but I decided to expand my search to the 309 and 310 because they had generally similar specs in terms of hFE and leakage. To my surprise, there was a very noticeable difference in tone among the different transistors, even when the gains, leakage, and voltages were essentially identical. Not sure why, but I heard what I heard. Anyway, after a bunch of testing, I settled on the GT310B, which had a somewhat clearer midrange to my ears and was less prone to sounding muddy at certain settings of the filter controls. The hFEs were 68, 86, and 83 for Q1-3, respectively, with leakage under 15µA for each one. For Q4, I used a MMBFJ201 on an adapter board that I had bought from Aion Electronics a while back for another project that I hadn't gotten around to building. I initially planned on using a through hole 2SK30A and designed the PCB accordingly, but the 2SK30As did not sound as good as the MMBFJ201, so I ended up removing the 2SK30A and subbed in the J201. Lastly, for the germanium diode, I used a D9E which my old Craftsman DMM measured as having a Vf of .28 volts. Everything else came from Tayda. After settling on the audio circuit, I then thought about the other features that I would want the pedal to have. I hate side-mounted jacks, so top-mounted jacks were a requirement. I'm also a big believer in over-voltage protection in addition to reverse polarity protection. The GT310B has a relatively low Vce of 10v and there are trimmers on the collectors of Q1 and Q2, so over-voltage protecti
Schematic
The schematic is in the post. Open it at Naegele Audio. No KiCad fragment has been drawn for this circuit yet.
Parts list 66 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- Low Filter and High Filter switch types are not printed; read from the poles drawn
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 22 | ||||
| R1 | 2.7M | 2.7M | read from the schematic by eye | |
| R2 | 470k | 470k | read from the schematic by eye | |
| R3 | 1k | 1k | read from the schematic by eye | |
| R4 | 10k | 10k | read from the schematic by eye | |
| R5 | 100k | 100k | read from the schematic by eye | |
| R6 | 500k | 500k | read from the schematic by eye | |
| R7 | 20kΩ | 20k | read from the schematic by eye | |
| R8 | 62k | 62k | read from the schematic by eye | |
| R9 | 27k | 27k | High Filter; read from the schematic by eye | |
| R10 | 220k | 220k | High Filter; read from the schematic by eye | |
| R11 | 10k | 10k | read from the schematic by eye | |
| R12 | 470k | 470k | read from the schematic by eye | |
| R13 | 1k | 1k | read from the schematic by eye | |
| R14 | 1k | 1k | read from the schematic by eye | |
| R15 | 47k | 47k | read from the schematic by eye | |
| R16 | 20k | 20k | blue (feedback) LED resistor; the drawing says the value is a suggestion; read from the schematic by eye | |
| R17 | 10k | 10k | read from the schematic by eye | |
| R18 | 2.4k | 2.4k | red LED resistor; the drawing says the value is a suggestion; read from the schematic by eye | |
| R19 | 22k | 22k | read from the schematic by eye | |
| R101 | 1MΩ | 1M | protection; read from the schematic by eye | |
| R102 | 10kΩ | 10k | protection; read from the schematic by eye | |
| R103 | 10kΩ | 10k | protection; read from the schematic by eye | |
| Capacitors 17 | ||||
| C1 | 100n | 100n | read from the schematic by eye | |
| C2 | 27p | 27p | read from the schematic by eye | |
| C3 | 100n | 100n | read from the schematic by eye | |
| C4 | 22n | 22n | Low Filter; read from the schematic by eye | |
| C5 | 220n | 220n | Low Filter; read from the schematic by eye | |
| C6 | 15n | 15n | read from the schematic by eye | |
| C7 | 10n | 10n | read from the schematic by eye | |
| C8 | 4.7nF | 4.7n | High Filter; read from the schematic by eye | |
| C9 | 39n | 39n | High Filter; read from the schematic by eye | |
| C10 | 330n | 330n | read from the schematic by eye | |
| C11 | 22n | 22n | read from the schematic by eye | |
| C12 | 2.2n | 2.2n | read from the schematic by eye | |
| C13 | 4.7u | 4.7u | read from the schematic by eye | |
| C14 | 330n | 330n | read from the schematic by eye | |
| C15 | 18n | 18n | read from the schematic by eye | |
| C101 | 100u | 100u | supply filter; read from the schematic by eye | |
| C102 | 100n | 100n | supply filter; read from the schematic by eye | |
| Diodes 5 | ||||
| D1 | 1N4148 | 1N4148 | read from the schematic by eye | |
| D2 | D9E | D9E | germanium; read from the schematic by eye | |
| D3 | 1N4148 | 1N4148 | read from the schematic by eye | |
| D101 | 15v zener | 15V | over-voltage protection; read from the schematic by eye | |
| D102 | 9.1v zener | 9V1 | over-voltage protection; read from the schematic by eye | |
| Transistors 12 | ||||
| Q1 | GT310B | GT310B | germanium, hFE 68 (from the post); read from the schematic by eye | |
| Q2 | GT310B | GT310B | germanium, hFE 86 (from the post); read from the schematic by eye | |
| Q3 | GT310B | GT310B | germanium, hFE 83 (from the post); read from the schematic by eye | |
| Q4 | J201 | J201 | JFET; the post's build used an MMBFJ201 on an adapter; read from the schematic by eye | |
| Q5 | 2N7002 | 2N7002 | turns off the feedback LED in bypass; read from the schematic by eye | |
| Q6 | 2N7002 | 2N7002 | LED switching; read from the schematic by eye | |
| Q7 | 2N7002 | 2N7002 | LED switching; read from the schematic by eye | |
| Q8 | MMBT3904 | MMBT3904 | the drawing notes this section is (dis)connected on purpose; read from the schematic by eye | |
| Q9 | MMBT3904 | MMBT3904 | the drawing notes this section is (dis)connected on purpose; read from the schematic by eye | |
| Q101 | CJ3407-ES | CJ3407-ES | P-channel MOSFET, polarity/over-voltage protection; read from the schematic by eye | |
| Q102 | CJ3407-ES | CJ3407-ES | P-channel MOSFET, polarity/over-voltage protection; read from the schematic by eye | |
| Q103 | CJ3407-ES | CJ3407-ES | P-channel MOSFET, polarity/over-voltage protection; read from the schematic by eye | |
| Potentiometers 4 | ||||
| Gain | B100k | B100k | Potentiometer | read from the schematic by eye |
| Color | B100k | B100k | Potentiometer | read from the schematic by eye |
| Feedback | B100k | B100k | Potentiometer | read from the schematic by eye |
| Level | A100k | A100k | Potentiometer | read from the schematic by eye |
| Trimmers 2 | ||||
| TRIM1 | 25k | 25k | in series with R3; read from the schematic by eye | |
| TRIM2 | 25k | 25k | in series with R14; read from the schematic by eye | |
| Switches 2 | ||||
| Low Filter | SPDT | SPDT | C5 or C4; read from the schematic by eye | |
| High Filter | DPDT | DPDT | C9/R9 or C8/R10; read from the schematic by eye | |
| LEDs 2 | ||||
| Red LED | Red LED | RED LED | bypass LED; read from the schematic by eye | |
| Blue LED | Blue LED | BLUE LED | feedback LED; read from the schematic by eye | |
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