Preamplifier on the KM551UD2 chip. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Preamplifiers
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The rated input and output voltage of the amplifier is 0,25 and 1 V, respectively, the harmonic coefficient in the frequency range of 20 ... 20000 Hz is not more than 0,02%, the signal-to-noise ratio (unweighted) is 90dB. The range of volume and tone control (at frequencies of 60 and 16000 Hz) is 60 and ±10 dB, respectively, the crosstalk between channels in the frequency range of 100...10000 Hz is at least 50 dB. The input and output impedances of the amplifier are 220 and 3 kΩ, respectively.
The circuit is assembled on a KM551UD2 chip. This IC is a dual op-amp with a supply voltage of ±5 to ±16,5 V. An IC with index A differs from a device with index B by half (4V) input common-mode voltage and a normalized noise voltage reduced to the input (no more than 1 μV at signal source resistance of 600 ohms; for KM551UD2B it is not standardized).
The bridge tone control is included in this case in the OOS circuit, covering the op-amp DA1.1 (hereinafter, the pin numbers of the second op-amp of the microcircuit are indicated in brackets). The input includes a thinly compensated volume control on a variable resistor R2.1 with a tap from the conductive element. Loudness (raising low-frequency components at low volume levels) can be turned off with the SA1.1 switch. The stable operation of the KM551UD2 IC (its frequency response has three kinks) is ensured by the C7 capacitor and the R5C5 circuit, the values of which are selected for the transfer coefficient Ku = 10 (the output voltage rise rate with this gain reaches 3 ... 4 V / μs). Capacitors C12, C13 prevent the amplifier from interconnecting with other devices in the path when powered from a common source. Variable resistor R12.1 (in another channel R12.2) adjust the stereo balance.
(click to enlarge)
All parts of the amplifier, except for variable resistors R2, R7, R11 and switch SA1, are mounted on a printed circuit board made of foil fiberglass. To control the volume and stereo balance, any dual variable resistors of group A are suitable, for tone control - resistors of group B.
The amplifier does not require tuning.
Author: tolik777 (aka Viper); Publication: cxem.net
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