Sureshot Studio / UREI MOD-One Discrete Opamp

Projects > Sureshot Studio / UREI MOD-One Discrete Opamp

UREI is perhaps best known for pioneering several iconic compressors and limiters. Lesser known, however, is their production of discrete opamp-based broadcast consoles in the late ’70s. Thomas Hopman of Sureshot Studios in Amsterdam has attempted to revive the DOA used repeatedly throughout the MOD-1 console for use in the DIY world. The result is a very simple circuit compared with more well-known DOAs, one that can be used in many applications including as a buffer, balanced receiver, and gain amp, or even a summing amplifier.

discrete op amp diy recording equipment


  • 27db of gain
  • 2520 footprint compatible
  • Ideal as a buffer, line receiver, or microphone preamp


  • Not commercially available (schematic and PCB layout can be found below)

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