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Music Card

The best gift, as you know, is the one that you made yourself with your own hands. That which will be described in this article is distinguished by its originality and will long delight the one to whom you want to give pleasure. However, such work requires skills and recording equipment. However, for a beginner amateur radio enthusiast who wants to learn new is a completely solvable task. Now, in order. The appearance of the music card is shown in the picture.
 Musical card
The gift is made to the nephew for the new year and contains a voice greeting. The design is executed in the form of a book. The tape that holds the book in the closed state, tied on a button. Having untied the ribbon, we open the book, and the square button is pressed, which is visible in the picture.
 Musical card
The button, having pulled away, turns on the voice message. This can be your voice or just a piece of music from your favorite cartoon.LEDs are inserted in the corners, which, winking, give the gift an even greater attractiveness. Inside the book is all the electronic filling, which is visible in the figure.
Music Card
The basis is a small board with a single-programmable sound chip аР8942А.
Music Card
This chip allows you to record up to 42 seconds of sound. Schematic diagram of the entire filling on the circuit diagram.  Musical card
The scheme is rather simple, it can be done by any novice radio fan. To build the device, you need, besides the sound chip itself, a speaker with a power of 0.5 W and a resistance of 8 ohms, a normally closed button (one whose contacts are opened when pressed), two KT315 transistors, four LEDs of different colors, two GR2035 batteries others with a total voltage of 6V, a socket for batteries and a little wire. The power socket for this product, for not having a finished one, was made from the neck of a plastic bottle.A spring from the old panel is installed in the bottom of the plug, and the threaded part of the neck is closed on one side with a grid of copper wire, which is the second electrode.
Musical card
The only significant problem is the special Programmer aP89W24USB, without which the chip can not be written. But if you consider that such a gift can be not only a pleasant surprise for people dear to you, but also a source of additional income, you can go broke for several thousand rubles.
Music Card
Musical card
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