Digital microphone for training feathered onomatopoeia. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Audio equipment

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Electronics today finds the most diverse and sometimes surprising application in amateur radio practice. Here, for example, the author of the proposed design uses it to teach birds various sounds.

The basis of this design is a relatively simple digital voice recorder (Fig. 1), made on a specialized ISD1420 chip.

(click to enlarge)

Products of the ChipCorder ISD1400 family are available in several modifications. The author is familiar with the ISD1420 (20 s recording) and ISD1416 (16 s recording with proportionally improved quality) in surface mount and standard DIP packages. Information storage is non-volatile cycle (100 years - typical), the number of recording cycles is 1000000 (typical), the transition to low power consumption mode is automatic (after the end of the recording / playback cycle), the current consumption in this mode is 0,5 μA.

The author opted for an ISDN 1420 chip in a DIP package based on ease of installation and maximum recording time.

The device diagram does not need special explanation. By holding down the SB3 ("Record") button, you can record the speech information coming from the BM1 electret microphone. In this case, the HL1 LED ("Record") lights up. By pressing the SB1 ("Play 1") or SB2 ("Play 2") button, you can listen to the recorded information through the dynamic head BA1 connected to the 14th and 15th pins of the microcircuit through the X1 connector. In this case, it is enough to press the SB2 button briefly, and keep the SB1 pressed during the entire playback time.

The author had to complicate the design by connecting an additional device to it (Fig. 2).

(click to enlarge)

This is due to the fact that, firstly, the volume turned out to be clearly insufficient (output power is about 10 mW) and, secondly, the +5 V supply voltage required a large battery compartment that did not fit in the selected case. Therefore, a voltage converter from 3 to 5 V, made on the DA1 chip, and a power amplifier on the DA2 chip and the VT1 transistor were added.

The additional device needs some explanation. As a primary power source, the author decided to use the batteries from which the GB1 battery is assembled. As indicated in the book by V. Kiyanitsa "Batteries, accumulators, chargers" (printing center of the Ladoga publishing house, St. Petersburg, 2002), the permissible discharge for a single nickel-cadmium battery is considered to be the one at which the voltage on its outputs decreases to 1 V. Accordingly, for two batteries connected in series, as in our case, the allowable voltage will be 2 V. The level of operation of the LBO output (output) of the MAX756 chip at the LBI input (pin 5) is 1,25 V. Based on these considerations select the divider R3R4. To indicate the need for charging, a red HL1 LED is installed.

Transistor VT1 in the power amplifier serves to reduce the current consumed by the DA2 chip in silent mode. Since in this mode there is a low potential at point a of the digital voice recorder output, the transistor is closed, and the CD input (pin 1) of the DA2 microcircuit is high. The current consumed by the microcircuit is minimal (about 60 μA) In the playback mode at point a, a level appears sufficient to open the transistor, the DA2 microcircuit goes into operating mode.

The design is made in a Chinese-made radio receiver case (Fig. 3).

From the receiver, a dynamic head, a volume control, a recording mode indication LED (in the receiver it was an on indicator) and mode switching buttons are used. An electret microphone is installed in the hole for the headphone jack of the radio receiver, and a flashing LED for the need to charge the batteries is installed in the hole for the flashlight lamp.

To mount the device, a one-sided foil universal board with a pitch between holes of 2,5 mm was used. There are no special requirements for details, except perhaps the minimum dimensions.

It is desirable to use a Schottky diode as a VD1 diode, which will increase the efficiency of the converter. Choke L1 is an inductor without a magnetic core, wound in heaps with PEV-1 wire on a polystyrene frame with an inner diameter of 7 mm, an outer one - 18 mm, and a height of 3 mm. The number of turns is about 150.

The author deliberately abandoned the magnetic circuit, since the available ones made it possible to significantly reduce the number of turns of the inductor to obtain a given inductance, but when operating in a loaded mode, they were saturated, the inductance dropped, and the output voltage of the converter decreased significantly.

As a sensor, any one with short-circuit contacts is suitable. The author used a relay with a wire hook soldered to the anchor (Fig. 4), to which a Christmas tree toy can be hung.

The parrot willingly plays with a shiny toy located in its cage, thereby turning on the recorder and listening to the recording of the sound fragment. In short, the training of human speech occurs, as they say, in automatic mode, without human participation.

Author: S.Makarets, Kiev, Ukraine

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