Enclosure not stated · 3 knobs
BOSS DD-2
Based on the Boss DD-2
- Category
- Delay· Delay Echo and Samplers
- Controls
- Delay Time · Feedback · Effect Level
- Price
- see vendor
- Tags
- Delay Echo and Samplers
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 179 rows
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ocr read from an image · sch paired from the schematic · fixed corrected by hand. Check marked values against the build document.
Check before you build · 3 values the reader of this schematic was not sure of
- R40 (2.7K, expander): designator printed twice; may be R43
- Q5: legend says Q3-Q6 2SC732TM-GR but Q5 is drawn as a 2SK30A-Y JFET; drawing label used
- DC supply board coil (unvalued filter choke) left out
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 73 | ||||
| R1 | 10K | 10k | read from the schematic by eye | |
| R2 | 1M | 1M | read from the schematic by eye | |
| R3 | 33K | 33k | 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 | 1K | 1k | read from the schematic by eye | |
| R7 | 47K | 47k | read from the schematic by eye | |
| R8 | 10K | 10k | read from the schematic by eye | |
| R9 | 10K | 10k | read from the schematic by eye | |
| R10 | 10K | 10k | read from the schematic by eye | |
| R11 | 10K | 10k | read from the schematic by eye | |
| R12 | 33K | 33k | read from the schematic by eye | |
| R13 | 33K | 33k | read from the schematic by eye | |
| R14 | 33K | 33k | read from the schematic by eye | |
| R15 | 10K | 10k | read from the schematic by eye | |
| R16 | 47K | 47k | read from the schematic by eye | |
| R17 | 1K | 1k | read from the schematic by eye | |
| R18 | 100K | 100k | read from the schematic by eye | |
| R19 | 10K | 10k | read from the schematic by eye | |
| R20 | 10K | 10k | read from the schematic by eye | |
| R21 | 10K | 10k | read from the schematic by eye | |
| R22 | 10K | 10k | read from the schematic by eye | |
| R23 | 10K | 10k | read from the schematic by eye | |
| R24 | 10K | 10k | read from the schematic by eye | |
| R25 | 10K | 10k | read from the schematic by eye | |
| R26 | 1M | 1M | read from the schematic by eye | |
| R27 | 10K | 10k | read from the schematic by eye | |
| R28 | 47K | 47k | read from the schematic by eye | |
| R29 | 22K | 22k | read from the schematic by eye | |
| R30 | 100K | 100k | read from the schematic by eye | |
| R31 | 22K | 22k | read from the schematic by eye | |
| R32 | 10K | 10k | read from the schematic by eye | |
| R33 | 47K | 47k | read from the schematic by eye | |
| R34 | 100K | 100k | read from the schematic by eye | |
| R35 | 2.2K | 2.2k | read from the schematic by eye | |
| R36 | 1M | 1M | read from the schematic by eye | |
| R37 | 1M | 1M | read from the schematic by eye | |
| R38 | 1M | 1M | read from the schematic by eye | |
| R39 | 10K | 10k | read from the schematic by eye | |
| R40 | 3.3K | 3.3k | compressor; R40 is printed twice; read from the schematic by eye | |
| ×1 | 2.7K | 2.7k | second R40 on the drawing (expander, in series with C34); possibly R43, which is otherwise missing; read from the schematic by eye | |
| R41 | 22K | 22k | read from the schematic by eye | |
| R42 | 47K | 47k | read from the schematic by eye | |
| R44 | 10K | 10k | read from the schematic by eye | |
| R45 | 10K | 10k | read from the schematic by eye | |
| R46 | 10K | 10k | read from the schematic by eye | |
| R47 | 10K | 10k | read from the schematic by eye | |
| R48 | 10K | 10k | read from the schematic by eye | |
| R49 | 10K | 10k | read from the schematic by eye | |
| R50 | 330K | 330k | read from the schematic by eye | |
| R51 | 1K | 1k | read from the schematic by eye | |
| R52 | 82K | 82k | read from the schematic by eye | |
| R53 | 1.5K | 1.5k | read from the schematic by eye | |
| R54 | 10K | 10k | read from the schematic by eye | |
| R55 | 2.7K | 2.7k | read from the schematic by eye | |
| R56 | 22K | 22k | read from the schematic by eye | |
| R57 | 100 | 100 | read from the schematic by eye | |
| R58 | 47K | 47k | read from the schematic by eye | |
| R59 | 10K | 10k | read from the schematic by eye | |
| R60 | 100K | 100k | read from the schematic by eye | |
| R61 | 1M | 1M | read from the schematic by eye | |
| R62 | 47K | 47k | read from the schematic by eye | |
| R63 | 6.8K | 6.8k | read from the schematic by eye | |
| R64 | 10K | 10k | read from the schematic by eye | |
| R65 | 10K | 10k | read from the schematic by eye | |
| R66 | 470K | 470k | read from the schematic by eye | |
| R67 | 470K | 470k | read from the schematic by eye | |
| R68 | 2.7K | 2.7k | read from the schematic by eye | |
| R69 | 10K | 10k | read from the schematic by eye | |
| R70 | 10K | 10k | read from the schematic by eye | |
| R71 | 10K | 10k | read from the schematic by eye | |
| R72 | 10K | 10k | read from the schematic by eye | |
| VR-R1 | 3.3K | 3.3k | volume board R1 (designator reused from the effect board); read from the schematic by eye | |
| Capacitors 58 | ||||
| C1 | 0.027uF | 27n | read from the schematic by eye | |
| C2 | 1uF | 1u | 50V electrolytic; read from the schematic by eye | |
| C3 | 1uF | 1u | 50V electrolytic; read from the schematic by eye | |
| C4 | 0.0047uF | 4.7n | read from the schematic by eye | |
| C5 | 33pF | 33p | read from the schematic by eye | |
| C6 | 10uF | 10u | 16V electrolytic; read from the schematic by eye | |
| C7 | 0.1uF | 100n | read from the schematic by eye | |
| C8 | 0.0027uF | 2.7n | read from the schematic by eye | |
| C9 | 0.0047uF | 4.7n | read from the schematic by eye | |
| C10 | 0.0047uF | 4.7n | read from the schematic by eye | |
| C11 | 1uF | 1u | 50V electrolytic; read from the schematic by eye | |
| C12 | 33pF | 33p | read from the schematic by eye | |
| C13 | 1uF | 1u | 50V electrolytic; read from the schematic by eye | |
| C14 | 470pF | 470p | read from the schematic by eye | |
| C15 | 0.0068uF | 6.8n | read from the schematic by eye | |
| C16 | 220pF | 220p | read from the schematic by eye | |
| C17 | 0.018uF | 18n | read from the schematic by eye | |
| C18 | 10uF | 10u | 16V electrolytic; read from the schematic by eye | |
| C19 | 0.0027uF | 2.7n | read from the schematic by eye | |
| C20 | 0.0027uF | 2.7n | read from the schematic by eye | |
| C21 | 100pF | 100p | read from the schematic by eye | |
| C22 | 100pF | 100p | read from the schematic by eye | |
| C23 | 47uF | 47u | 6V electrolytic; read from the schematic by eye | |
| C24 | 0.047uF | 47n | read from the schematic by eye | |
| C25 | 0.0027uF | 2.7n | read from the schematic by eye | |
| C26 | 1uF | 1u | 50V electrolytic; read from the schematic by eye | |
| C27 | 0.047uF | 47n | read from the schematic by eye | |
| C28 | 1uF | 1u | 50V electrolytic; read from the schematic by eye | |
| C29 | 1µFfixed | 1u | 50V electrolytic; read from the schematic by eye | |
| C30 | 47uF | 47u | 6.3V electrolytic; read from the schematic by eye | |
| C31 | 10uF | 10u | 16V electrolytic; read from the schematic by eye | |
| C32 | 0.68uF | 680n | read from the schematic by eye | |
| C33 | 0.68uF | 680n | read from the schematic by eye | |
| C34 | 10uF | 10u | 16V electrolytic; read from the schematic by eye | |
| C35 | 0.0068uF | 6.8n | read from the schematic by eye | |
| C36 | 150pF | 150p | read from the schematic by eye | |
| C37 | 0.0012uF | 1.2n | read from the schematic by eye | |
| C38 | 0.0027uF | 2.7n | read from the schematic by eye | |
| C39 | 1uF | 1u | 50V electrolytic; read from the schematic by eye | |
| C40 | 330pF | 330p | read from the schematic by eye | |
| C41 | 0.001uF | 1n | read from the schematic by eye | |
| C42 | 10Pfixed | 10p | read from the schematic by eye | |
| C43 | 0.1uF | 100n | read from the schematic by eye | |
| C44 | 22pF | 22p | read from the schematic by eye | |
| C45 | 33pF | 33p | read from the schematic by eye | |
| C46 | 33pF | 33p | read from the schematic by eye | |
| C47 | 0.1uF | 100n | read from the schematic by eye | |
| C48 | 0.01uF | 10n | read from the schematic by eye | |
| C49 | 10uF | 10u | 16V electrolytic; read from the schematic by eye | |
| C50 | 4.7uF | 4.7u | 16V electrolytic; read from the schematic by eye | |
| C51 | 100uF | 100u | 16V electrolytic; read from the schematic by eye | |
| C52 | 0.027uF | 27n | read from the schematic by eye | |
| C53 | 0.1uF | 100n | read from the schematic by eye | |
| C54 | 0.1uF | 100n | read from the schematic by eye | |
| C55 | 47uF | 47u | 6.3V electrolytic; read from the schematic by eye | |
| C56 | 0.1uF | 100n | read from the schematic by eye | |
| VR-C1 | 0.1uF | 100n | volume board C1 (designator reused from the effect board); read from the schematic by eye | |
| DC-×1 | 0.1uF | 100n | DC supply board; read from the schematic by eye | |
| Diodes 14 | ||||
| D1 | 1SS133-T77 | 1SS133-T77 | read from the schematic by eye | |
| D2 | 1SS133-T77 | 1SS133-T77 | read from the schematic by eye | |
| D3 | RD5.1EB-3 | RD5.1EB-3 | 5.1V zener; read from the schematic by eye | |
| D4 | 1SS133-T77 | 1SS133-T77 | read from the schematic by eye | |
| D5 | 1SS133-T77 | 1SS133-T77 | read from the schematic by eye | |
| D6 | RD11FB-3 | RD11FB-3 | 11V zener; read from the schematic by eye | |
| D7 | 1SS133-T77 | 1SS133-T77 | read from the schematic by eye | |
| D8 | 1SS133-T77 | 1SS133-T77 | read from the schematic by eye | |
| D9 | 1SS133-T77 | 1SS133-T77 | read from the schematic by eye | |
| D10 | 1SS133-T77 | 1SS133-T77 | read from the schematic by eye | |
| D11 | 1SS133-T77 | 1SS133-T77 | read from the schematic by eye | |
| D12 | 1SS133-T77 | 1SS133-T77 | read from the schematic by eye | |
| D13 | 1SS133-T77 | 1SS133-T77 | read from the schematic by eye | |
| D14 | Diode | DIODE | no part number given (not in the D1-D13 legend); read from the schematic by eye | |
| Transistors 13 | ||||
| Q1 | 2SK30A-O | 2SK30A-O | read from the schematic by eye | |
| Q2 | 2SC732TM-GR | 2SC732TM-GR | read from the schematic by eye | |
| Q3 | 2SC732TM-GR | 2SC732TM-GR | read from the schematic by eye | |
| Q4 | 2SC732TM-GR | 2SC732TM-GR | read from the schematic by eye | |
| Q5 | 2SK30A-Y | 2SK30A-Y | drawn as 2SK30A-Y although the LPF note says Q3-Q6 are 2SC732TM-GR; read from the schematic by eye | |
| Q6 | 2SC732TM-GR | 2SC732TM-GR | read from the schematic by eye | |
| Q7 | 2SC2603F | 2SC2603F | read from the schematic by eye | |
| Q8 | 2SK30A-Y | 2SK30A-Y | read from the schematic by eye | |
| Q9 | 2SC732TM-GR | 2SC732TM-GR | read from the schematic by eye | |
| Q10 | 2SC732TM-GR | 2SC732TM-GR | read from the schematic by eye | |
| Q11 | 2SA1115F | 2SA1115F | read from the schematic by eye | |
| Q12 | 2SC2603F | 2SC2603F | read from the schematic by eye | |
| Q13 | 2SA1115F | 2SA1115F | read from the schematic by eye | |
| ICs 13 | ||||
| IC1 | M5218 | M5218 | dual op amp (5218); read from the schematic by eye | |
| IC2 | NE570 | NE570 | compander, compressor and expander halves; read from the schematic by eye | |
| IC3 | M5218 | M5218 | dual op amp (5218); read from the schematic by eye | |
| IC4 | 4066 | 4066 | read from the schematic by eye | |
| IC5 | uPC271 | UPC271 | comparator; 311 given as alternate; read from the schematic by eye | |
| IC6 | 5534 | 5534 | NE5534; read from the schematic by eye | |
| IC7 | RDD63H101 | RDD63H101 | main controller (ADM); read from the schematic by eye | |
| IC8 | 74HC00 | 74HC00 | VCO, 1.28-5.18 MHz; read from the schematic by eye | |
| IC9 | BA634 | BA634 | mute timer; read from the schematic by eye | |
| IC10 | 78L05 | 78L05 | read from the schematic by eye | |
| IC11 | 4164 | 4164 | 64K DRAM; read from the schematic by eye | |
| IC12 | 4164 | 4164 | 64K DRAM; read from the schematic by eye | |
| IC13 | 4164 | 4164 | 64K DRAM; read from the schematic by eye | |
| Potentiometers 3 | ||||
| Delay Time | A10K | A10k | Potentiometer | VR-1, volume board; read from the schematic by eye |
| Feedback | B50K | B50k | Potentiometer | VR2 (F.BACK); read from the schematic by eye |
| Effect Level | B50K | B50k | Potentiometer | VR3 (E.LEVEL); read from the schematic by eye |
| Trimmers 2 | ||||
| Clock High | 2.2K | 2.2k | RT-1 on the effect board; read from the schematic by eye | |
| Clock Low | 10K | 10k | RT-1 on the volume board (same designator printed twice); read from the schematic by eye | |
| Switches 1 | ||||
| S1 | 2P4T | 2P4T | Mode: Short/Middle/Long/Hold, SW board; read from the schematic by eye | |
| LEDs 1 | ||||
| ×1 | SLP135B | SLP135B | Check LED; or LN-28RP; read from the schematic by eye | |
| Other 1 | ||||
| R73 | RKM14L492-103F | RKM14L492-103F | R-2R resistor array (DAC), per the legend; read from the schematic by eye | |