| Serge board | Description | RES board |
| 1st Generation (1973) | ||
|---|---|---|
| R1 PRC | dual voltage processor | RES01 |
| R2 MIX | dual mixer | |
| R3 P&T | peak and trough | RES10 |
| R4 ROU | triple bidirectional router | RES05 |
| R5 TWS | triple waveshaper & dual mixer | RES11 |
| R6 MOD | gate/ring modulator | RES03 |
| R7 ENV | envelope generator | RES04 |
| R8 VCO | voltage controlled oscillator | RES02 or CGS48 |
| R9 NEG | dual negative slew | RES09 |
| R10 POS | dual positive slew | RES06 |
| R11 COM | triple comparator and Schmitt trigger | RES13 |
| R12 VCF | voltage controlled filter | RES14 |
| R13 PSD | power supply decoupling | |
| R14 HGA | high gain amps | RES16 |
| R15 PRG | programmer | RES08 |
| R16 SEQ | sequencer | RES15 |
| 2nd Generation | ||
| SSG20 | smooth and stepped function generator | RES07 |
| NOISE | noise generator and s&h | RES25 |
| PHA | vc phase shifter | RES27 |
| PREVERB | ||
| dual MIX | ||
| 1075SR ASR | analog shift register | CGS34 |
| 1175SS HC | same as SSG20? | |
| TRK | Touch responsive keyboard, from Synapse | RES24 |
| KEG env gen | ||
| 3rd Generation (1977) | ||
| 101 QCA | quad vca | RES20 |
| 102 PAN | dual stereo equal power driver | RES21 / RES19 |
| 103 MIXER | dual mixer | |
| 104 QPAN | quadraphonic equal power driver | |
| 105 | ||
| 106 NTO/VCO | pco and nto core | |
| 107 NTO/CON | nto vc waveshaping, vc slew and vc fm | |
| 108 | ||
| 109 | ||
| 110 VCF2 | variable bandwidth vcf | RES110A |
| 111 VCFS | variable slope vcf | |
| 112 VCFQ | variable q vcf / extended range vcf | RES12 |
| 113 VCM | wave multipliers | RES18 |
| 114 DSG | dual universal slope generator / dual transient generator | RES17 / RES114 |
| 115 KBD | touch activated keyboard sequencer TKB | |
| 116 ADSR | extended adsr | |
| PEF | pitch and envelope follower | |
| Triple NT waveshaper from 107 NTO/CON | RES26 | |
| 4th Generation (1981) | ||
| 201 AP | active processor | |
| 202 EQ | resonant equalizer | RES23 |
| 203 MIX | audio mixer, maybe cv processing/scaling/buffering too | |
| 204 SQP | n step sequencer/programmer | |
| 205 NCOM | divide/n comparator, dual comparator, Schmitt trigger | |
| 206 VCA1 | dual VCA | |
| 207 VCA2 | stereo equal power driver | |
| 208 WAD | Wilson Analog Delay | CGS208B |
| 209 RING | balanced modulator | |
| 210 QUAN | quantizer | |
| 211 FS/AP | allpass ladder for frequency shifter | |
| 212 QUO | quadrature oscillator | |
| 213 FS/SP | signal processor for frequency shifter | |
| 214 2VCA | dual exponential response vca | |
| 215 EF | envelope follower and preamp (no info on preamp) | |
| 216 MDAC | n voice | |
| 225 PDIV | STS Pulse Divider | |
| 229 AMX | STS Audio Mixer w/ Phase Switch | |
| Miscellaneous | ||
| BLOG | Boolean logic | |
| PEF | Pitch & Envelope Follower | PCB photos |
| PEF | diagrams/schematics | |
| SONICA | Electronic Musical Instrument (with Tcherepnin patents) | |
| Extras | C/M Module & Synapse articles (Synthesizer's Little Helpers) | |
| LTSpice models | VCA, VCFS, DSG, WS2 .asc models | |
| PCB layouts | DIY your own PCB (break out the ferric chloride!) | |
Updated May 27 2011