What is the circuit for the Polyfusion Noise Generator?

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Discussion Overview

The discussion revolves around understanding the circuit diagram of the Polyfusion Noise Generator, specifically focusing on the role and identification of the 3130 component within the circuit. Participants explore the nature of the circuit, including its components and functionality, with an emphasis on noise generation and filtering.

Discussion Character

  • Technical explanation
  • Exploratory

Main Points Raised

  • One participant seeks clarification on the circuit diagram linked in the post.
  • Another participant speculates that the 3130 component may be a type of noise generator or waveform generator, suggesting that the rest of the circuit consists of analog filters for converting white noise into pink noise and other spectra.
  • A different participant proposes that the 3130 is an operational amplifier used to amplify thermal noise from a diode junction, referencing a now-defunct website for additional context.
  • Another participant identifies the 3130 as the CA3130 op-amp, sharing personal experience with the component and confirming its characteristics as an 8 pin DIP.

Areas of Agreement / Disagreement

Participants express differing views on the exact nature of the 3130 component, with some suggesting it is a noise generator while others identify it as an operational amplifier. The discussion remains unresolved regarding the definitive identification and role of the 3130 in the circuit.

Contextual Notes

Some assumptions about the function of the 3130 and the overall circuit design are not fully explored, and there may be dependencies on specific definitions of noise types that are not clarified in the discussion.

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i was wondering if anyone could explain the circuit at he following link
http://www.synthfool.com/schematics/polynoise.gif
 
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I don't know what the 3130 component is, so I googled the following:

+3130 +generator +ic

and got some hits that might apply. Assuming the 3130 is some kind of noise generator or other waveform generator, the rest of the circuit looks like analog filters to convert the white noise into pink and other noise spectra. The reference to "Infra Red" must be some other noise spectra.
 
Last edited by a moderator:
RCA made an op-amp that was a CA3130. I've used it. It's an old part. I'm sure that is what it is. It was an 8 pin DIP which it looks like the one in the link is.
 

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