Question: A circle containing these components 1 . ( power supply + - 1 2 V ) . Use Lm 7 8 1 2 , lm

A circle containing these components1.(power supply +-12V).Use Lm7812, lm7912 Regulators. Bridge rectifier. step down transformer 24V.2. Transistor..3. OP_AMP.. 4.555 Timer.

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