Doorbell on ISD25xxx chip. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators

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Doorbells, announcing the arrival of guests with some kind of melody or other sounds, were described in the magazine more than once. In recent years, they began to be assembled on the basis of microcontrollers, which, together with the simplification of the design, greatly expanded their capabilities. However, it is no secret that the repetition of devices on microcontrollers is not yet available to everyone, since it requires a computer, a programmer and appropriate software. The proposed call is made on the basis of a specialized chip of the ChipCorder family from Winbond Electronics. Its main feature is the ability to use any sound fragments (speech, music, etc.) as a ringing signal, which are simply recorded in the memory of the microcircuit, as in a conventional tape recorder.

Schematic diagram of the doorbell is shown in fig. 1. Its basis is an ISD25x series chip [1], which is a device for recording and reproducing audio information. The principle of operation of the microcircuit is similar to that used in devices of the ISD1200, ISD1400 series [2] and is based on the technology of storing an analog signal in multilevel non-volatile memory cells. The information storage period is 100 years, the number of record-playback cycles is at least 100.

The device works as follows. In the initial state, the DA1 chip is in standby mode and consumes a small current - a few microamperes. The bell button with closing contacts is connected to the socket XS3. With a short press on it, the microcircuit plays the first sound fragment, and at the end of it returns to standby mode again. Pressing the call button again initiates playback of the second fragment, and so on, i.e., with each subsequent press, another signal sounds, and so on until all the recorded information is played, after which the cycle will repeat. The number of fragments can be any, but their total duration is determined by the type of microcircuit (see table).

The SB1 ("Start / Stop") button duplicates the bell and is used when recording, as well as to check the contents of the chip's memory in playback mode. Capacitor C6 reduces the sensitivity of the device to interference. When you press the SB2 ("Reset") button, the microcircuit returns to the beginning of the first fragment.

To record signals, you can use an electret microphone (it is connected to the XS2 jack) or any other signal source - TV, radio, computer sound card, etc. (they are connected to the XS1 jack). Diodes VD1, VD2 protect the input of the microcircuit from an unacceptable signal level, using a variable resistor R2, set the required recording level.

To record a fragment, switch SA1 is moved to the right (according to the diagram) position (in this case, the HL1 LED lights up) and the SB2 "Reset" button sets the microcircuit to the beginning of the signal block to be recorded. Then briefly press the SB1 button, while the LED goes out and the recording of the first fragment begins. The recording is completed by pressing the same button (SB1), as a result of which the LED lights up again.

The rest of the fragments are written in the same way. The chip memory filling signal is a constant glow of the HL1 indicator. For recording through the XS2 jack, it is convenient to use a multimedia microphone headset with an electret microphone, such as MHS101, MHS111 or similar. If a separate microphone is used, its "+" lead is connected to the center pin of this jack.

After completing the recording, the SA1 switch is transferred to its original (shown in the diagram) position and, briefly pressing the SB1 button, listen to the first fragment, pressing it again - the second, etc.

Since the current consumption is small in standby mode, the device does not have a dedicated power switch. If the bell needs to be turned off, for example, at night, the switch is inserted into the power supply circuit. If there is no need to record from a microphone, the circuit can be simplified by excluding elements C2, C4, C5, R3-R6, XS2, and instead of R4, install a jumper. For recording only from a microphone, the elements R1, R2, R4, VD1, VD2, XS1 are excluded from the circuit.

Any chip of the ISD25x series can be used in the device, but it must be taken into account that the larger its capacity, the lower the bandwidth (see table). The best sound quality is provided by ISD2560, but if you need to have a longer recording-playback time, you should use ISD2575, ISD2590 (using ISD25120 is not recommended due to too narrow bandwidth). LED HL1 - any small-sized, preferably with increased brightness, diodes VD1, VD2 - KD503, KD521, KD522 with any letter index, polar capacitors - any small-sized, non-polar - K10-17a, variable resistor R2 - SPZ-4, SP4-1 etc., permanent - MLT, C2-33, P1-4. Buttons SB1, SB2 - any small without fixing in the pressed position, switch SA1 - bipolar of any type, sockets XS1, XS2 - standard for connecting stereo headphones. Dynamic head BA1 of any power 0,1 ... 1 W, to increase the volume, you should use a head with increased output. To connect to the bell button, it is advisable to use a shielded wire (the braid is connected to a common wire).

The bell can be powered from a stabilized unit with an output voltage of 5 V at a current of up to 100 mA, as well as from a battery consisting of three galvanic cells or four nickel-cadmium batteries. In the latter case, a 12V power supply is used to recharge the battery (it is connected to the XS4 socket), and VD3, HL2 and R11 elements are introduced into the device. The rating of the latter is chosen based on the required charging current. Zener diode VD3 limits the voltage on the chip during charging. LED HL2 - charging indicator.

Most of the parts are mounted on a printed circuit board made in accordance with fig. 2. Together with the battery, it is placed in a housing of suitable dimensions, on the walls of which a variable resistor R2, buttons SB1, SB2, switch SA1, sockets XS1-XS3 and LED HL1 are fixed (and when powered by a battery, also an XS4 socket and LED HL2). Diodes VD1, VD2 and resistor R1 are mounted on the terminals of the resistor R2, resistor R11 - on the terminals of the XS4 socket.

Literature

1. Description of microcircuits of the ISD25x series. - winbond-usa.com/products/isdproducts/chipcorder/datasheets/2560/ISD2560.pdf>.
2. Podorozhny S. ChipCorder microcircuits for recording and reproducing speech - Radio, 2001, No. 10, p. 20.

Author: I. Nechaev, Kursk

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