OCR Text |
Show , An Approved Method for Smooth Volume Control For a smooth control of volume in amplifiers using transformers, impedances imped-ances or resistances, the method shown in the accompanying diagrams Is suggested. A variable resistance is connected across the secondary of . -i Transformer coupled. Impedance Or. Resistance coupled the transformer with the slider arm wired to the grid of the tube. In the case of impedance or resistance amplifiers, am-plifiers, the grid leak is replaced by the variable resistance of .5 megohm maximum, such as the centralab modulator or others of the. type. |