Vibrating chair. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electronics in medicine
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In many stores for sale there are wraps-massage chairs. The principle of operation is simple: 5-7 vibration motors are mounted in the seat cover, the operation of which is controlled by the remote control. The disadvantage of such a system is that the program of operation of the motors is laid down initially and does not depend on external factors in any way.
Why not make a circuit that will turn on one or another vibrating massager, depending on the appearance of a certain frequency from the speakers of a tape recorder or radio tape recorder? In other words, the chair will vibrate to the beat of the music, thereby making you feel the music with your back.
I implemented the idea by creating two blocks: a 3-channel color and music console and an amplifier for it. The scheme and recommendations for it are given below.
(click to enlarge)
As you can see, the circuit consists of two blocks: an amplifier and the set-top box itself, which in turn is divided into 3 filters - low, medium and high frequencies.
In principle, you can do without an amplifier, but in this case, the system will not work from weak signal sources (for example, a line output).
We will take the signal from the speaker of the tape recorder (car radio). To prevent distortion and overload, the signal from the speaker will be decoupled through a transformer. Basically, anyone will do. I took a matching transformer with a primary winding resistance of 300 ohms, a secondary winding of 600 ohms. A resistance of 300 ohms will not affect the sound from this speaker in any way.
Next, the signal goes to an amplifier assembled on a TEA2025B chip (analogues КА2206N, TA7769). The amplifier consumes from 3 to 14 V, delivering 2 watts of power. This is enough for the color music console to work. From 12-14 V, the microcircuit heats up, so you should make a small radiator for it.
The next step is to create filters for the color music box. I took a proven circuit from the magazine "Radioconstructor" No. 7 for 2005. The only thing I added is a composite transistor (from KT315 and KT819G). The fact is that vibration motors have a sufficiently large power and, accordingly, they need a powerful transistor. KT 819G transistors are desirable to be carried out on wires and placed on radiators, but taking into account the fact that the transistor case is its Collector, therefore, contact of the transistor cases is unacceptable.
All 3 filters have almost the same part layout, so I drew a board (from the side of the tracks) that will fit all 3 filters.
In this scheme, each filter has its own setting. Variable resistors R6, R7, R8 regulate the signal level to the filters, and R5, R12, R16 - the frequency band. These settings are useful for matching this unit to a specific car radio and listening preferences.
Next, you need to place on a small board a connector for connecting a massage chair and capacitors. Different modifications of the massage chair have different current consumption, so the capacitors are selected experimentally in parallel with the motors.
The last step is connecting the chair. We disassemble the control panel from the cape chair and solder all the wires going to the chair itself. Next, you need to determine the Common wire (+) from the motors and the outputs from each of them. As a rule, this common wire is thicker and has a black or yellow color. We take the power supply and connect the plus to this common wire. And the minus is connected in series to each of the remaining wires. Thus, we will determine which of the motors acts on different points of the back.
We select three motors in the cloak chair that are most preferable to you and connect the wires from them, respectively, to low, high and medium frequencies.
As you can see, only three vibration motors are involved in the chair, respectively, low, medium and high frequencies.
If this seemed not enough to you, you can use the remaining vibration motors by connecting them in parallel. That is, each frequency will have 1-2 vibration motors.
Author: Alexey Gorelov, Bryansk; Publication: cxem.net
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