Parts · Opto
PDV-P9203
LDR (Photoresistor).4 circuits use this part. Listed as: LDR, 10-30k light, 5M dark.
Datasheet · from advancedphotonix.com
Substitutes same kind
Optocouplers and photoresistors of the same construction; the response speed and resistance range set how an effect sounds. The figures are read off each part's datasheet (this one's from page 2), typical where the sheet gives a typical value, otherwise the maximum. Closest first; the last column says what differs. A different part can change the sound, and a circuit may lean on one particular figure, so read the build document's notes before you swap.
This part
| Part | On | Dark | Rise | Decay | Boards |
|---|---|---|---|---|---|
| PDV-P9203 | 10k | 5M | 60 ms | 25 ms | 4 |
Bare CdS cell, 10-30 k at 10 lux and over 5 M dark; pair it with an LED in a light-tight sleeve for a homemade vactrol.
Alternatives
| Part | On | Dark | Rise | Decay | Boards | Differs |
|---|---|---|---|---|---|---|
| GL5528 | 10k | 1M | 20 ms | 30 ms | 3 | lower dark resistance. CdS cell, 10 to 20 kΩ at 10 lux, gamma 0.6. |
| GL5537-1 | 20k | 2M | 20 ms | 30 ms | 2 | lower dark resistance. CdS cell, 20 to 30 kΩ at 10 lux, gamma 0.6. |
| GL5516 | 5k | 500k | 30 ms | 30 ms | 9 | lower dark resistance. CdS cell, 5 to 10 kΩ at 10 lux, gamma 0.5. |
| GL5549 | 100k | 10M | 20 ms | 30 ms | 1 | higher on resistance. CdS cell, 100 to 200 kΩ at 10 lux, gamma 0.9. |
| Faceplate | Circuit | Based on | Category | Vendor | Box | Knobs | Price | BOM |
|---|---|---|---|---|---|---|---|---|
| Deluge Optical Vibe MPSA18 · PDV-P9203 · TL072 EarthQuaker Devices The Depths · 125B | EarthQuaker Devices The Depths | Vibrato / Chorus | Aion FX | 125B | 5 | $12.50 | 70 | |
| Hexatron Optical Phaser 2N3904 · 4558 · LT1054 · LT1054CP Mu-Tron Phasor II · 125B | Mu-Tron Phasor II | Phaser | Aion FX | 125B | 3 | $16.00 | 107 | |
| Straylight Chorus/Vibe 2N5087 · 2N5088 · 2N5089 · 78L15 Shin-ei Uni-Vibe · 1590BBS | Shin-ei Uni-Vibe | Vibrato / Chorus | Aion FX | 1590BBS | 5 | $16.00 | 133 | |
| Straylight Mini Chorus/Vibe 2N5088 · 2N5089 · 78L15 · KSP13 Shin-ei Uni-Vibe · 125B | Shin-ei Uni-Vibe | Vibrato / Chorus | Aion FX | 125B | 3 | $16.00 | 123 |