Hearing aid, hypnosis, memory enhancement three-purpose machine circuit

Three-purpose machine for hearing aid, hypnosis, and memory enhancement. This three-purpose machine has a simple circuit, is easy to make, and does not require debugging. It has certain practical value and is very suitable for amateur production. 　　

working principle  　　

The electromechanical principle is shown in Figure 1. It consists of a CMOS six-inverter. A-D form an odd-stage negative feedback amplifier. R1 is a feedback resistor. Adjusting the ratio of R2 and R1 can adjust the voltage gain, and its typical gain can reach 100 times. F3 and F4 are connected in parallel to enhance the load capacity of the amplifier. E and F form a low-frequency signal generator, which is the simplest CMOS multivibrator. Its oscillation frequency is approximately 0.7Hz. Changing C2 or R3 can change its oscillation frequency. R4 and MIC form a pickup circuit. When used for hearing aid and memory enhancement applications, the switch S is placed in the 1 position, and the MIC converts the external sound into an electrical signal, enters the amplifier for amplification, and is then output by the headphones. When doing memory enhancement, listening with a pair of headphones can reduce external interference. When using the hypnotic device, put the switch S in the 2 position, and the 0.7Hz low-frequency signal is amplified by the transformer. You can hear a "click-click" sound in the headphones, similar to the sound of rain, which makes people relax and relax. Have a hypnotic effect. The component selection and production component list is shown in the table below. No. Name Model Quantity R1 Resistor 10M 1/8W 1 R2 Resistor 100K 1/8W 1 R3 Resistor 1M 1/8W 1 R4 Resistor 2K 1/8W 1 C1, C2 Electrolytic capacitor 1u/16V 2 IC COMS six inverter CD4069, C033 , C003, C063, CC4069 1 MIC Microphone Small Electret Condenser Microphone 1 CZ1, CZ2 Headphone Socket 2 The power supply can be selected between 4.5-9V, and can be powered by a laminated battery. As long as the wiring is correct, this circuit can be used without debugging. The entire circuit can fit in a small soap box.