IC1 and R10, RP1, and C4 form an astable multivibrator with an oscillation frequency of approximately 40 kHz. It drives the infrared light-emitting diode D5 and emits infrared light with a carrier of 40 kHz. Infrared receiving adopts the receiving tube D6 for use with D5. IC3 is the special integrated block CX20106 for infrared receiving amplification. Its center frequency f0 depends on C1, R14. When f0 is the same as the 40 Hz emitted, IC7's 7 feet are low. Level, VT2 cutoff, SCR1 is not conducting, and the xenon lamp NH is not lit. Usually, there are certain restrictions on smart portable projectors in 2 aspects: smart portable projector,smart portable projector for iphone,best smart portable projector 2020,cheap smart portable projector,mini smart portable projector wifi Shenzhen Happybate Trading Co.,LTD , https://www.happybateprojectors.com
1. Size: Usually the size is the size of a mobile phone.
2. Battery life: It is required to have at least 1-2 hours or more of battery life without power connection. In addition, its general weight will not exceed 0.2Kg, and some do not even need fan cooling or ultra-small silent fan cooling. Can be carried with you (it can be put into a pocket, the screen can be projected to 40-50 inches or more, so sometimes we also call it a pico projector or a pocket projector.)