As shown, the car search device includes a transmitter and a receiver. The transmitter uses 555 as the core to form a medium-wave frequency oscillator. The oscillation frequency should be chosen to be slightly lower than the carrier frequency of the broadcast amplitude modulation of 535 kHz. The frequency value is determined by R1, RPl, and Cl, that is, f=1.44/(RPl+2R1)CL Ll and C2 form an output resonant circuit, which is selected and then transmitted through the antenna through C3. The receiving circuit consists of an input frequency selective network and a 741 op amp. The amplification factor of the amplifier depends on the ratio of RP2/R2. LED1~LED5 are used to indicate the intensity of the received signal, and as the signal is strengthened, the light pipes will be sequentially illuminated.
Anti-microbial Hydrogel Screen Protector
Bacteria are everywhere in our daily lives. Mobile phones have become an indispensable item for us. Of course, bacteria will inevitably grow on the phone screen. The antimicrobial coating used in our Anti Microbial Screen Protector can reduce 99% of the bacterial growth on the screen, giving you more peace of mind.
Self-healing function
The Screen Protector can automatically repair tiny scratches and bubbles within 24 hours.
Clear and vivid
A transparent protective layer that provides the same visual experience as the device itself.
Sensitive touch
The 0.14mm Ultra-Thin Protective Film can maintain the sensitivity of the touch screen to accurately respond to your touch. Like swiping on the device screen.
Oleophobic and waterproof
Anti-fingerprint and oil-proof design can help keep the screen clean and clear.
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Shenzhen Jianjiantong Technology Co., Ltd. , https://www.tpuprotector.com