Circuit Project Electronic

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This circuit Dc converter step up voltage, For 5VDC to +12V and -12V Isolated dual Switching Regulator by IC LM2587-12V.
Voltage supply input 4V to 6V, Output current 0.3A.
Detail other see in circuit.

Detail IC LM2587
SIMPLE SWITCHER 5A Flyback Regulator
The LM2587 series of regulators are monolithic integrated circuits specifically designed for [...]

This circuit is boost regulator,
input volt DC12V for output DC28V (28v relay)
The circuit is built around the LM2585,
and uses the energy stored in an inductor to boost the 12v to 28.
The circuit does it’s switching around 100 Khz,
but generates no noise if SMT components are used.
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