Enclosure not stated · 2 knobs
Serge ring modulator
- Category
- Ring Mod / Synth· Ring Modulators and Frequency Shifters
- Controls
- Initial Amplitude · CV Gain
- Price
- see vendor
- Tags
- Ring Modulators and Frequency Shifters
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 22 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×4 | 220K | 220k | X trim, Y trim, diode bias and Q3 base-to-ground resistors; no designators drawn; read from the schematic by eye | |
| ×3 | 330R | 330 | X trim divider, X AC input divider, RM OUT series; read from the schematic by eye | |
| ×1 | 150K | 150k | X DC input; read from the schematic by eye | |
| ×2 | 22K | 22k | X DC IN and X AC IN to ground; read from the schematic by eye | |
| ×2 | 68K | 68k | X AC input series; U2 feedback; read from the schematic by eye | |
| ×1 | 15K | 15k | U1 pin 5 bias; read from the schematic by eye | |
| ×4 | 47K | 47k | Y DC input, initial amplitude, Y AC series, Y AC to ground; read from the schematic by eye | |
| ×2 | 1K | 1k | Q1 and Q2 bases to ground; read from the schematic by eye | |
| ×1 | 2K2 | 2.2k | Q3 emitter; read from the schematic by eye | |
| Capacitors 3 | ||||
| ×4 | 100n | 100n | supply decoupling; read from the schematic by eye | |
| ×1 | 22p | 22p | U2 feedback; added to prevent oscillation, not in the original; read from the schematic by eye | |
| ×2 | 470n | 470n | X AC IN and Y AC IN coupling; read from the schematic by eye | |
| Diodes 1 | ||||
| ×1 | 1N4148 | 1N4148 | original Serge used 1N914; read from the schematic by eye | |
| Transistors 3 | ||||
| Q1 | BC559 | BC559 | original was matched PNP pair 2N4196; use matched PNPs; read from the schematic by eye | |
| Q2 | BC559 | BC559 | matched with Q1; read from the schematic by eye | |
| Q3 | BC559 | BC559 | original 2N4250; any PNP; read from the schematic by eye | |
| ICs 2 | ||||
| U1 | CA3080A | CA3080A | OTA; original CA3080E; read from the schematic by eye | |
| U2 | TL071 | TL071 | original LM307N; read from the schematic by eye | |
| Potentiometers 2 | ||||
| Initial Amplitude | B22K | B22k | Potentiometer | 22K LIN; read from the schematic by eye |
| CV Gain | 22K | 22k | Potentiometer | wired as variable resistor; read from the schematic by eye |
| Trimmers 2 | ||||
| X Trim | 22K | 22k | original 25K; read from the schematic by eye | |
| Y Trim | 22K | 22k | original 25K; read from the schematic by eye | |