Cheap’s 73 EQ

Projects > Cheap's 73 EQ

The Sound is in the Silicon.

The Cheap’s 73 EQ is a faithful, accessible and affordable version of the classic Neve 1073 Equalizer.

Designed as close to the original schematics, as possible, the frequency response is absolutely authentic. Through the use of integrated circuits and gyrators, also known as simulated inductors, cost has been kept to a minimum. With a basic frequency response, that is flat within +/-0,5dB from 20Hz – 20kHz, and a signal to noise ratio of at least 75-80dB, the performance is surprisingly good. Even more so, when keeping in mind, that the most expensive electrical component will be a 5$ Op-Amp (pots & switches aside).

All technical documentation, including schematics, a bill of materials and circuit measurement data, is available on GitHub under the Creative Commons Attribution-ShareAlike 4.0 International License.


    • High Frequency: +/- 16dB shelving filter at 12kHz
    • Mid Frequency: +/- 18dB peaking filter with proportional Q,
      switchable between: 0.36kHz, 0.7kHz, 1.6kHz, 3.2kHz, 4.8kHz, 7.2kHz
    • Low Frequency: +/- 16dB shelving filter,
      switchable between: 35Hz, 60Hz, 110Hz, 220Hz
    • High Pass Filter: 18dB per octave,
      switchable between 50Hz, 80Hz, 160Hz, 300Hz

External Links

Project repository on GitHub
Discussion topic on GroupDIY
Discussion topic on gearslutz