Finely compensated volume control combined with tone controls. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tone, volume controls
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The original scheme of the combined passive node for volume and tone control in a transistor amplifier is shown in fig. 5 [4]. Here, the variable resistor R3, together with the circuits R1C1, R2C2, R4C4, forms a correction adjustment circuit at higher frequencies. Chain C5R5, connected to the output of the volume control R7, provides low-frequency correction. A slight rise in the frequency response at lower frequencies in the position of minimum attenuation is created by resistor R2. The depth of the low-frequency correction is regulated by the resistor R6.
Rice. 5 (click to enlarge)
Wide ranges for adjusting the frequency response now seem redundant, so it makes sense to exclude capacitor C2, replace capacitor C1 and resistor R1 with a jumper, and reduce the resistance of the variable resistor R6 to 100 kOhm. After such refinement, the decrease in the frequency response in the region of higher frequencies is eliminated, and the frequency response adjustment range at lower frequencies is narrowed to 10 dB.
Literature
- Ivanov A. Finely compensated volume control - Radio No. 12/1993 p.21
- Zuev P. Volume control with distributed frequency correction - Radio No. 8/1986 p.49-51
- Davydov M. Acoustic systems of broadcasting receivers - Radio No. 4 / 1956 pp. 52-54
- Bozdeh J. Designing additional devices for tape recorders (1977, translated from Czech) - M. Energoizdat, 1981. pp. 174,188.
Author: A. Shikhatov; Publication: bluesmobile.com/shikhman
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