Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle
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Photocoupler
The following is the circuit diagram of [LM2576-ADJ Application Circuit] The LM2576 series of regulators are monolithic integrated circuits that provide the functions of a buck switching regulator that can drive a 3A load with excellent linearity and load regulation, and the LM2576 regulator contains a frequency compensator. With a fixed frequency, it can minimize the number of external components and is easy to use.
(Editor: Circuit Diagram)
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