Tl431 constant current circuit

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Heng Jiaxing AO3401

3225 50M crystal

Crystal oscillator

The constant current source circuit "constant current value is related to VREF and external resistance. When selecting the power transistor, the margin should be considered. The constant current source can be used as a current limiter if it is connected with the voltage regulator.
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