House bell on the ISD1210P chip. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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House bell on the ISD1210P chip. Encyclopedia of radio electronics and electrical engineering

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

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At present, amateur radio is not weakening. Radio amateurs come to the rescue of new technologies, computer modeling, and a freer search for information. Parts are much easier to come by than they used to be. Through the Internet, you can purchase both Russian and imported components.

Your attention is invited to the circuit solution of the "Apartment" call. Many collect tweeter calls, calls with a set of melodies (for example Music call on IC UMS8 etc.

This call is made on two microcircuits, which are not currently in short supply. Chip K174UN7 - bass amplifier and chip ISD1210P. The ISD1210P chip is a chip for recording and playing sound for 10 seconds. For a house call, I think this is the optimal time. In this circuit, sound can be recorded directly from the line output of the tape recorder by connecting it through a resistor to capacitor C3. Variants of the recorded fragments can be very diverse: voice, music or combined.

Rice. 1 Schematic diagram of the call (click to enlarge)

Power regulator on the chip KR1182PM1

Power regulator on the chip KR1182PM1
Rice. 2 PCB topology

I have applied the following. In the music editor I wrote gong sound (vibraphone instrument). Converted it to a WAV file and added a voice message: "Gentlemen, you have guests."

Then I recorded the resulting file on a tape recorder, and from it into a chip corder. All information took 5 seconds in time. A WAV file is a little over 80 kilobytes. call.wav

In order for the relay to work after pressing the button, it is necessary to record a sinusoidal signal for 0,5 seconds, at the beginning of the file, with a frequency of 15-18 Hz. When the call button SA1 is pressed, a signal is sent from the chip corder through the capacitor C4 to the capacitor C22. Passing through the chain D5, R17 and the logical element DD1.1. creates output 1 high. Having passed through the resistor R19 and the amplifier on transistors Q1 and Q2, it causes the relay to close the contacts. By closing the call button and pin 24 of the ISD1210P chip, the device remains connected to the network and the recorded fragment is played back. After the end of the sound of the fragment, the relay keeps the contacts closed for another 3-5 seconds. After that, a low level appears at output 1 DD1.1, and the relay again operates to open the contacts, de-energizing the entire device.

Resistor R18 regulates the turn-off delay time. The device in the power supply on the transistor VT1, diode D6, resistors R17, R18, which controls the relay, is made according to the "Pause Relay" principle. It is used to turn off the tape recorder at the end of tracks. If you want to record a fragment from a microphone, then use the microphone recording node. When finished, you can turn it off. Chip-coder chip can be rewritten 100000 times.

The amplifier on K174UN7 is switched on according to the standard scheme, with the introduction of corrective chains to reduce %n.i. Features in the setting has no.

The printed circuit board for the power supply was not developed.

Literature

1. V. Gromov, A. Radomskin "IMPROVEMENT OF AMPLIFIER PARAMETERS ON K174UN7"
2. N.A. Drobnitsa "ELECTRONIC DEVICES FOR RADIO AMATEURS", Moscow "Radio and communication" 1985.
3.ChipCorder*
Technology by iso ISD1200 Series "Single-Chip Voice Record/Playback Devices 10 and 12-Second Durations."

Author: Anatoly Nikolaevich Patrin, Kirsanov, Tambov region, patrin@tamb.ru; Publication: cxem.net

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