Practical Snoring Therapy Apparatus: Traditional Chinese Circuit Desig

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snoring therapy deviceModern scientific and technological achievements show that snoring is closely related to people's sleeping habits. Snoring can be relieved when the snorer changes his position in bed. The snoring treatment device is like an "electronic guardian" that constantly monitors whether the sleeper is snoring.When in use, the laryngeal microphone is placed on the neck so that it faces the front center of the neck to the left or right to detect snoring. When snoring at a certain level is detected by the microphone BP, the C and D electrodes attached to the wrist or foot output stimulation pulses, forcing the snorer to change his posture in bed and stop snoring; if the snoring continues, the C and D pulse stimulation will continue until the snoring stops. Especially after long-term use of this treatment device, snorers can form a benign sleep routine and finally get rid of the bad habit of snoring.The circuit principle is shown in Figure 55-1. It is mainly composed of a four-operation amplifier LM324 and peripheral components. It includes snoring detection circuit, snoring amplification circuit, pulse generation circuit and pulse conversion circuit.Figure 55-1When the throat-transmission microphone connected to terminals A and B detects snoring, the signal is limited by VD1 and VD2, and C1 is sent to IC-1 for about 50 times pre-amplification. C2 and R1, which are connected to the input terminal of the amplifier circuit of this stage, have a certain frequency selection effect on the snoring audio.IC-2 is a variable gain amplifier. Adjusting RP1 can change the gain, thereby changing the snoring detection sensitivity.When the snoring signal amplified to a certain amplitude is rectified by VD3, C7 is charged through R6, causing the potential at the contacts of R7 and R8 to rise, and VD4 is reverse-biased and cut off. At this time, the pulse generation circuit composed of IC-3 and peripheral resistors and capacitors acts. In fact, when C7 is not charged, the non-inverting terminal of IC-3 is grounded through R14, R10, VD4 and R8. The potential of the phase terminal it uses is low, IC-3 outputs low level, and the pulse conversion circuit cannot work. The access of R15 and R14 gives this level of operational amplifier a gain of nearly 100 times. When C7 is charged and VD4 is reverse-biased, and the potential of the bridge RP2 and R10, R11 and R12 contacts are close to each other, IC-3 will undergo low-frequency self-oscillation due to the action of C8 and R15. Changing C8 can adjust the oscillation frequency.The oscillation signal passes through R17 to conduct VT intermittently, and is boosted by the step-up transformer T to obtain the required stimulation pulse on RP3. R18 and VD6 form a pulse output indication circuit.In addition, since VT is a Darlington tube, its working transient current is about 110mA. In order not to affect the normal operation of the front-end circuit, a simple voltage stabilizing circuit of R12, VD5, and C9 is connected here to keep other circuits except the pulse conversion circuit in relatively stable working conditions.Selection and production of components:The IC is LM324, and only three of the op amps are used here. VD1 ~ VD4 are 1N4148, VD5 …

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