555 multi-vibrator circuit diagram - Database & Sql Blog Articles

Crystal oscillator
Quartz Oscillator 3225 20M OSC


Figure 555 multivibrator circuit

Solar Power Bank

Solar mobile Power Bank is a new type of power source that converts solar energy into electric energy and stores it in a battery, and at the same time has a mobile nature. The storage battery can be any form of power storage device, which is generally composed of three parts: solar photovoltaic cell, storage battery, and voltage regulating element.
With the energy crisis and the deteriorating environmental problems caused by petrochemical fuels, people are paying more and more attention, and the current digital products are becoming more and more popular. Solar mobile power is developed under this background.

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