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| PT2389-S | 5-mode preset equaliser IC with bass booster & 3D effect | Princeton Technology Corp. | SO | 24 | N/A | N/A | PT2389-S datasheet (84K) |
| PT2389-SN | 5-mode preset equaliser IC with bass booster & 3D effect | Princeton Technology Corp. | SO | 24 | N/A | N/A | PT2389-SN datasheet (84K) |
| PT2390 | Echo IC built-in microphone amplifier & output mixer | Princeton Technology Corp. | DIP | 28 | N/A | N/A | PT2390 datasheet (202K) |
| PT2390-S | Echo IC built-in microphone amplifier & output mixer | Princeton Technology Corp. | SO | 28 | N/A | N/A | PT2390-S datasheet (202K) |
| PT2395 | Enhanced digital echo IC | Princeton Technology Corp. | PDIP | 40 | N/A | N/A | PT2395 datasheet (265K) |
| PT2396 | Digital echo/Surround processor IC | Princeton Technology Corp. | DIP | 24 | N/A | N/A | PT2396 datasheet (152K) |
| PT2396-S | Digital echo/Surround processor IC | Princeton Technology Corp. | SO | 24 | N/A | N/A | PT2396-S datasheet (152K) |
| PT2398 | Echo/Surround processor | Princeton Technology Corp. | DIP | 28 | N/A | N/A | PT2398 datasheet (246K) |
| PT2399 | Echo processor IC | Princeton Technology Corp. | DIP | 16 | N/A | N/A | PT2399 datasheet (81K) |
| PT2399S | Echo processor IC | Princeton Technology Corp. | SO | 16 | N/A | N/A | PT2399S datasheet (81K) |