The Model 423 D.C. Operational Amp (Repairable) logic module that produces RMS: 12 Watts - 40 Watt Peak with an Octal Plug-In. It can be used as a moderate power amplifier for Audio & Industrial applications.

It can be used as an Audio amplifier to drive loudspeakers and can be equalized for response enhancement. It can also be configured as a Constant-Current amplifier for frequency response extention / enhancement of Dynamic Loudspeakers.

The 423 Operational Amp can be used as a Servo-Motor Driver / Controller for Industrial uses like a Positioning Servo for Damping Control and a Velocity Servo for RPM.

An operational amplifier ("op-amp") is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. An op-amp produces an output voltage that is typically hundreds of thousands of times larger than the voltage difference between its input terminals.


  • Electronics
  • Power Amplifier
  • Servo Amplifier / Servomechanisms
  • Constant-Current Amp
  • Damping Control
  • Velocity Servo for RPM control

  • $ 60 (U.S. Funds)


  • Connector: Octal Plug-In
  • Zi = 100MΩ
  • Offset: ±20mV
  • Drift: ±10µV/°C
  • CM = ±20V
  • Noise: -115dbm
  • Bandwidth: DC to 150KHz
  • Connector: Octal Plug-In
  • RMS: 12 Watts - 40 Watt Peak Audio
  • THD: 0.1%
  • 6V-36V
  • 1-1/2" W x 3-1/4" D x 2-1/5" H
  • 7 oz.