Amplifier with discretely adjustable transmission ratio. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio amateur designer
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The amplifier, the circuit of which is shown in the figure, may be useful to many radio amateurs. Its transfer coefficient is changed by switching resistors R2-R17 in the OOS circuit, covering the op-amp DA1. Domestic analogue of OU 741 - K140UD7.
The resistances of these resistors are selected in such a way that in each subsequent position of the SA1 switch, the gain of the amplifiers changes by 3 dB. The input impedance of the amplifier is 10 kOhm.
To switch resistors, a switch with a seamless switching is required (when it is transferred from one position to another, the feedback circuit should not be broken).
Literature
- Zesileni v krocich po 3 dB.- Sdelovaci technika, 1986, No. 4. With. 160.
Publication: N. Bolshakov, rf.atnn.ru
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