Musical Instrument R-C Tuning Oscillator Employing Auto-Transformer Tappings to Give +/- 0.005% Interval Accuracy

Baxandall PJ. Musical Instrument R-C Tuning Oscillator Employing Auto-Transformer Tappings to Give +/- 0.005% Interval Accuracy. In: AES Convention 50. Audio Engineering Society; 1975. Paper L-55-1. Available from: https://aes.org/publications/elibrary-page/?id=2431

@inproceedings{Baxandall1975_2431,
  author = {Baxandall, Peter J.},
  title = {{Musical Instrument R-C Tuning Oscillator Employing Auto-Transformer Tappings to Give +/- 0.005\% Interval Accuracy}},
  booktitle = {AES Convention 50},
  note = {Paper L-55-1},
  year = {1975},
  month = mar,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=2431}
}

TY  - CPAPER
TI  - Musical Instrument R-C Tuning Oscillator Employing Auto-Transformer Tappings to Give +/- 0.005% Interval Accuracy
AU  - Baxandall, Peter J.
T2  - AES Convention 50
M1  - Paper L-55-1
PY  - 1975
DA  - 1975/03/06
UR  - https://aes.org/publications/elibrary-page/?id=2431
PB  - Audio Engineering Society
LA  - en
AB  - In recent years much attention has been given to digital techniques for generating a series of semitones in equal-temperament frequency ratios (1)-(5). : The present contribution is concerned with a non-digital solution to the problem, which is both economical and capable of very high ratio accuracy and long-term stability. The new circuit (patent applied for) is basically an R-C oscillator of the double-integrator-loop variety (6), but the frequency of intervals are determined by varying the gain of one of the integrators by means of tappings on a small and quite cheap auto-transformer. Only the ratios of this transform are of first-order significance, not the inductance values as such.
ER  -