Enclosure not stated · 3 knobs
Electro Harmonix Badstone 2
Based on the Electro-Harmonix Badstone 2
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- Phaser· Phasers
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- Phasers
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 52 rows
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Check before you build · 3 values the reader of this schematic was not sure of
- 10K in series with the sweep 100K trim: smudged, could be 160K
- LFO electrolytic near B4: read 1uF, could be 1.5uF
- 27K stage pulldowns: could be 2.7K on the A1 stage
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 26 | ||||
| ×1 | 100K | 100k | input to ground; read from the schematic by eye | |
| ×1 | 10K | 10k | input series; read from the schematic by eye | |
| ×1 | 10M | 10M | input buffer bias; read from the schematic by eye | |
| ×1 | 47K | 47k | input buffer emitter to +9V; read from the schematic by eye | |
| ×1 | 2.2M | 2.2M | bend switch; read from the schematic by eye | |
| ×6 | 120K | 120k | JFET drain to ground, one per stage; read from the schematic by eye | |
| ×11 | 120K | 120k | all-pass stage feedback/divider pairs (two per stage A1-B1, one at B2); read from the schematic by eye | |
| ×6 | 27K | 27k | op amp output pulldown to -9V, one per stage; read from the schematic by eye | |
| ×1 | 75K | 75k | B2 feedback; read from the schematic by eye | |
| ×1 | 300K | 300k | B2 divider to ground; read from the schematic by eye | |
| ×1 | 39K | 39k | 2N3563 base; read from the schematic by eye | |
| ×1 | 100K | 100k | 2N3563 base to -9V; read from the schematic by eye | |
| ×2 | 470K | 470k | sweep bias divider; read from the schematic by eye | |
| ×1 | 10K | 10k | to JFET gates; read from the schematic by eye | |
| ×1 | 10K | 10k | in series with 100K trim (sweep); read from the schematic by eye | |
| ×1 | 10K | 10k | LFO B3 input; read from the schematic by eye | |
| ×1 | 75K | 75k | LFO B3 to B4; read from the schematic by eye | |
| ×1 | 120K | 120k | LFO B4 feedback; read from the schematic by eye | |
| ×1 | 10M | 10M | LFO B4; read from the schematic by eye | |
| ×1 | 10K | 10k | LFO B4 pin 13 to ground; read from the schematic by eye | |
| ×1 | 1.8K | 1.8k | rate pot series; read from the schematic by eye | |
| ×1 | 75K | 75k | color/mix path; read from the schematic by eye | |
| ×1 | 6.8K | 6.8k | color/mix path; read from the schematic by eye | |
| ×1 | 47K | 47k | mix node to ground; read from the schematic by eye | |
| ×2 | 10K | 10k | output mix network; read from the schematic by eye | |
| ×1 | 5.6K | 5.6k | output mix network; read from the schematic by eye | |
| Capacitors 13 | ||||
| ×1 | .01uF | 10n | input coupling; read from the schematic by eye | |
| ×1 | .047uF | 47n | dry signal to color pot; read from the schematic by eye | |
| ×1 | .1uF | 100n | buffer to first stage; read from the schematic by eye | |
| ×1 | .1uF | 100n | to bend switch; read from the schematic by eye | |
| ×6 | .01uF | 10n | all-pass stage caps; read from the schematic by eye | |
| ×1 | .047uF | 47n | sweep bias filter; read from the schematic by eye | |
| ×1 | 2.2uF | 2.2u | LFO B3; read from the schematic by eye | |
| ×1 | .022uF | 22n | LFO B4; read from the schematic by eye | |
| ×1 | 1uF | 1u | LFO, electrolytic to -9V; read from the schematic by eye | |
| ×1 | 560pF | 560p | mix filter; read from the schematic by eye | |
| ×2 | .1uF | 100n | mix node coupling; output coupling; read from the schematic by eye | |
| ×2 | 10uF | 10u | supply filter, 15V; read from the schematic by eye | |
| ×2 | .1uF | 100n | supply bypass; read from the schematic by eye | |
| Transistors 3 | ||||
| ×1 | 2N5087 | 2N5087 | PNP input buffer; read from the schematic by eye | |
| ×6 | 2N4302 | 2N4302 | JFET, one per phase stage; read from the schematic by eye | |
| ×1 | 2N3563 | 2N3563 | sweep transistor; read from the schematic by eye | |
| ICs 2 | ||||
| A | ? | ? | quad Norton op amp (sections A1-A4), type not given; likely LM3900; read from the schematic by eye | |
| B | ? | ? | quad Norton op amp (sections B1-B4), type not given; likely LM3900; read from the schematic by eye | |
| Potentiometers 3 | ||||
| Pedal | 100K | 100k | Potentiometer | pedal pot for manual sweep; read from the schematic by eye |
| Color | 1M | 1M | Potentiometer | read from the schematic by eye |
| Rate | 1M | 1M | Potentiometer | drawn 1MΩ; read from the schematic by eye |
| Trimmers 3 | ||||
| ×1 | 500K | 500k | sweep bias trim; read from the schematic by eye | |
| ×1 | 100K | 100k | sweep range trim; read from the schematic by eye | |
| ×1 | 100K | 100k | output mix trim; read from the schematic by eye | |
| Switches 2 | ||||
| Bend | SPDT | SPDT | bend toggle switch; read from the schematic by eye | |
| Pedal/Osc | SPDT | SPDT | pedal/oscillator foot switch; read from the schematic by eye | |