Mini head phone amplifier circuit is use transistor BD135 which can improve sound of your head phone in Class A ,Fortunately the head phone amp has a much easier job to do, in that neither the output power requirements nor the load characteristics are so severe, since headphones typically have a load, impedance , higher of 50 ohm, (typical 600 ohm),
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This free circuit for switching supply to 5V with IC LM2575 Which can improve your electronic project in power resource for control voltage to stable or using supply in electronic project.
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