Music trainer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Musician
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The music simulator is designed for those who are learning to sing. By singing through the microphone of the simulator, you can control by the lights on which note you have taken.
(click to enlarge)
The signal from microphone B1 is fed to a two-stage amplifier (transistors V1 and V2). The gain can be set with a variable resistor R2. From the load of the second stage (resistor R5), the signal is fed to the limiter (transistor V4), which is necessary to obtain a constant signal amplitude when the distance between the singer and the microphone changes. From the load resistor (R10) of the emitter follower (transistor V5), the signal enters through the capacitor C6 and the decoupling resistors R11-R18 to the frequency selective filters.
Each filter consists of a resonant circuit (inductor L1 and capacitor C7), a low-frequency amplifier (transistor V6), a detector (diode V7) and a three-stage DC amplifier (transistors V6, V8, V9) loaded on indicator light H1.
The oscillatory circuit of each filter is tuned to its own frequency. So, the contour of the first filter shown in the diagram is tuned to a frequency of 261 Hz (note C to the first octave), the second - 293 Hz (Re), then 5 Hz (Mi), 329,5E Hz (F), 34 Hz ( Sol), 392 Hz (La), 440 Hz (Si), 494 Hz (Up to the second octave).
Electrolytic capacitors - K50-6, the rest - MEM; fixed resistors-MLT 0,25, variable-SP-1. Diodes can be any D9 series.
The coil is wound on two alsifer rings folded together, size K55 x 32 x 11,7; its inductance for the first filter is about 2,3 H. More precisely, the inductance of the coils is selected when setting up the simulator. Lamp HI - МН2.5 X 0,15; power supply GB3 - battery 3336L, GB1 and GB2 - elements 373; microphone - MD64A; power switch - three-section.
The adjustment of the device begins with the setting of the operating modes of the transistors. By selecting resistors R1 *, R4 *, R6 *, they achieve that the voltage on the collector of the corresponding transistor is approximately 1,5 V. Then the signal from the low-frequency generator is fed to the input of the simulator (the microphone is turned off). By setting the desired resonant frequencies of the filters on the generator, the number of turns of the corresponding coils is selected. The HI lamp serves as an indicator of the filter setting. The output voltage of the alternator should be a little more than the minimum voltage at which the signal lamp lights up. The same level of operation of frequency-selective filters is set by selecting resistors R19 *.
Author: A.Frolov
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