Enclosure not stated · 2 knobs
Rick Holt Little Angel MKII Mini Chorus
Based on the Rick Holt Little Angel Chorus
- Category
- Vibrato / Chorus
- Price
- see vendor
- Tags
- freestompboxes.org trace
From the vendor
A simple chorus designed by Rick Holt (August 2010) and enhanced by Mictester (April 2011) at freestompboxes.org, built around the common PT2399 delay chip instead of the obsolete MN3007 bucket brigade. A TL074 handles the input buffer, mixing, output stage and the LFO, which modulates the PT2399 clock through a 2N3904. The post offers it as an easier alternative to the Electro-Harmonix Small Clone that Kurt Cobain used.
An even simpler version using a single dual op-amp is in the Little Angel thread on freestompboxes.org.
Schematic
The schematic is in the post. Open it at Revolution Deux. No KiCad fragment has been drawn for this circuit yet.
Parts list 64 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- The 16-pin delay chip is not labeled on the drawing; the post says it is a PT2399.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 35 | ||||
| R1 | 1M | 1M | read from the schematic by eye | |
| R2 | 330K | 330k | read from the schematic by eye | |
| R3 | 330K | 330k | read from the schematic by eye | |
| R4 | 330K | 330k | read from the schematic by eye | |
| R5 | 10K | 10k | bias divider; read from the schematic by eye | |
| R6 | 10K | 10k | bias divider; read from the schematic by eye | |
| R7 | 4.7K | 4.7k | read from the schematic by eye | |
| R8 | 47K | 47k | read from the schematic by eye | |
| R9 | 100K | 100k | read from the schematic by eye | |
| R10 | 100K | 100k | read from the schematic by eye | |
| R11 | 10K | 10k | read from the schematic by eye | |
| R12 | 10K | 10k | read from the schematic by eye | |
| R13 | 10K | 10k | 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 | 10K | 10k | read from the schematic by eye | |
| R17 | 10K | 10k | read from the schematic by eye | |
| R18 | 10K | 10k | read from the schematic by eye | |
| R19 | 10K | 10k | read from the schematic by eye | |
| R20 | 47K | 47k | read from the schematic by eye | |
| R21 | 4.7K | 4.7k | read from the schematic by eye | |
| R22 | 47K | 47k | read from the schematic by eye | |
| R23 | 100K | 100k | read from the schematic by eye | |
| R24 | 100K | 100k | read from the schematic by eye | |
| R25 | 47 | 47 | read from the schematic by eye | |
| R26 | 100K | 100k | read from the schematic by eye | |
| R27 | 47 | 47 | read from the schematic by eye | |
| R28 | 100K | 100k | read from the schematic by eye | |
| R29 | 100K | 100k | read from the schematic by eye | |
| R30 | 220K | 220k | read from the schematic by eye | |
| R31 | 220K | 220k | read from the schematic by eye | |
| R32 | 4.7K | 4.7k | read from the schematic by eye | |
| R33 | 47 | 47 | read from the schematic by eye | |
| R34 | 4.7K | 4.7k | read from the schematic by eye | |
| R35 | 68K | 68k | read from the schematic by eye | |
| Capacitors 22 | ||||
| C1 | 100n | 100n | read from the schematic by eye | |
| C2 | 47u | 47u | electrolytic; read from the schematic by eye | |
| C3 | 100n | 100n | read from the schematic by eye | |
| C4 | 100n | 100n | read from the schematic by eye | |
| C5 | 1n | 1n | read from the schematic by eye | |
| C6 | 1n | 1n | read from the schematic by eye | |
| C7 | 10n | 10n | read from the schematic by eye | |
| C8 | 10n | 10n | read from the schematic by eye | |
| C9 | 100n | 100n | read from the schematic by eye | |
| C10 | 100n | 100n | read from the schematic by eye | |
| C11 | 100n | 100n | read from the schematic by eye | |
| C12 | 100n | 100n | read from the schematic by eye | |
| C13 | 100n | 100n | read from the schematic by eye | |
| C14 | 10u | 10u | electrolytic; read from the schematic by eye | |
| C15 | 10u | 10u | electrolytic; read from the schematic by eye | |
| C16 | 100u | 100u | electrolytic; read from the schematic by eye | |
| C17 | 100n | 100n | read from the schematic by eye | |
| C18 | 47u | 47u | electrolytic; read from the schematic by eye | |
| C19 | 10n | 10n | read from the schematic by eye | |
| C20 | 10u | 10u | electrolytic; read from the schematic by eye | |
| C21 | 10u | 10u | electrolytic; read from the schematic by eye | |
| C22 | 10u | 10u | electrolytic; read from the schematic by eye | |
| Diodes 1 | ||||
| D1 | 1N4148 | 1N4148 | read from the schematic by eye | |
| Transistors 1 | ||||
| Q1 | 2N3904 | 2N3904 | read from the schematic by eye | |
| ICs 3 | ||||
| IC1 | TL074 | TL074 | read from the schematic by eye | |
| IC2 | PT2399 | PT2399 | read from the schematic by eye | |
| IC3 | 78L05 | 78L05 | or 7805; read from the schematic by eye | |
| Potentiometers 2 | ||||
| Depth | B470K | B470k | Potentiometer | read from the schematic by eye |
| Speed | B100K | B100k | Potentiometer | read from the schematic by eye |