Preamplifier on the chip K140UD1B. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Preamplifiers
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The pre-amplifier on the K140UD1B chip is designed to work in the path of high-quality sound reproduction of signals from various program sources. It is advisable to use it with a power amplifier with a sensitivity of 0,5 ... 1 V with an input resistance of at least 10 ... 20 kOhm.
The main parameters:
- Rated frequency range, Hz.......20...20000
- Rated voltage, mV, at an output voltage of 1 V at a frequency of 1 kHz from the input for connecting a pickup and a tape recorder ....... 200
- radio receiver ....... 20
- microphone......1
- Input impedance, kOhm, input for connecting a pickup and tape recorder.......1000
- radio receiver ....... 100
- microphone......5
- Relative noise level (at an output voltage of 1 V), dB.......-70
- Signal level control range, dB.......60
- Tone control limits, dB, at frequency: 31,5 Hz.......±18
- 18 kHz......±14
The device is an inverting amplifier on the A1 op amp with a tone control in the circuit surrounding it OOS and a thinly compensated output volume control.
The level of lower frequencies is regulated by a variable resistor R10, higher - by a resistor R16. Loudness circuits R7C3C4R8 and R12C7C8R14 provide the necessary change in the frequency response of the amplifier when adjusting the volume with a variable resistor R17. If desired, the loudness circuits can be disabled by switch S1.
To power the amplifier, a stabilized bipolar source with low ripple voltage is required. Variable resistors R10, R16 must be group B, RI7 - group C.
The amplifier does not require tuning. The self-excitation of the device, which is possible in some cases, is eliminated by selecting capacitors C1 * and C2 *.
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