Enclosure not stated · 1 knob
Electro Harmonix Bassballs
Based on the Electro-Harmonix Bassballs· 5 other boards clone it
- Category
- Other· Filters Wahs and VCFs
- Controls
- Sensitivity
- Price
- see vendor
- Tags
- Filters Wahs and VCFs
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 26 rows
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Check before you build · 2 values the reader of this schematic was not sure of
- .47uF tantalum: the leading point is faint, could be 4.7uF
- Fuzz switch: drawn with OFF/ON contacts and points D/E/F, exact type unclear
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×1 | 100Ω | 100 | envelope rectifier, after the 1N4148; read from the schematic by eye | |
| ×1 | 1K | 1k | to the DIRECT output; read from the schematic by eye | |
| ×3 | 2.7K | 2.7k | 1458 input; one at each 4558 filter stage input; read from the schematic by eye | |
| ×1 | 4.7K | 4.7k | envelope follower input; read from the schematic by eye | |
| ×2 | 22K | 22k | 2N5088 bases, from the trimmers; read from the schematic by eye | |
| ×6 | 47K | 47k | two Vb divider, fuzz pulldown, two filter collector loads, output pulldown; read from the schematic by eye | |
| ×1 | 100K | 100k | fuzz switch feed; read from the schematic by eye | |
| ×2 | 220K | 220k | input bias from Vb; envelope op amp feedback; read from the schematic by eye | |
| ×1 | 330K | 330k | envelope reservoir discharge; read from the schematic by eye | |
| ×4 | 470K | 470k | two per 4558 filter stage; read from the schematic by eye | |
| ×1 | 2.2M | 2.2M | envelope op amp - input to ground; read from the schematic by eye | |
| Capacitors 8 | ||||
| ×2 | 560pF | 560p | ceramic, filter stages; read from the schematic by eye | |
| ×2 | .0047uF | 4.7n | second filter stage; read from the schematic by eye | |
| ×2 | .022uF | 22n | first filter stage; read from the schematic by eye | |
| ×3 | .047uF | 47n | input coupling, envelope op amp output, fuzz switch; read from the schematic by eye | |
| ×1 | .47uF | 470n | tantalum, envelope follower input; read from the schematic by eye | |
| ×1 | 1uF | 1u | electrolytic, effect output coupling; read from the schematic by eye | |
| ×1 | 4.7uF | 4.7u | tantalum, envelope reservoir; read from the schematic by eye | |
| ×3 | 10uF | 10u | electrolytic: supply, Vb, sensitivity pot feed; read from the schematic by eye | |
| Diodes 1 | ||||
| ×1 | 1N4148 | 1N4148 | envelope rectifier; read from the schematic by eye | |
| Transistors 1 | ||||
| ×3 | 2N5088 | 2N5088 | one envelope emitter follower, two variable-resistance elements in the filter; one is drawn '2N5C88'; read from the schematic by eye | |
| ICs 2 | ||||
| ×1 | 1458 | 1458 | dual op amp: input buffer and envelope amp; read from the schematic by eye | |
| ×1 | 4558 | 4558 | dual op amp: two filter stages; read from the schematic by eye | |
| Potentiometers 1 | ||||
| Sensitivity | B10K | B10k | Potentiometer | drawn '10K LIN'; read from the schematic by eye |
| Trimmers 1 | ||||
| ×2 | 10K | 10k | filter transistor bias trimmers; read from the schematic by eye | |
| Switches 1 | ||||
| Fuzz | SPDT | SPDT | fuzz on/off toggle; contact arrangement uncertain; read from the schematic by eye | |
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