how to convert 12v 3A to 5v 3A

12v 3A to 5v 3A convert

Needed

BD140 transister

BC558 transister

MJ2955

330 ohm resistor

LM7805 ic

47 ohm resistor

18 ohm resistor

470 ohm resistor

0.22 ohm resistor

Led

Now time for circuit design

follow the circuit picture below

MJ2955 transistor uses

The PNP Bipolar Power Transistor is designed for use in high power amplifier and switching amplifier applications.

:MJ2955 transister is made in silicon meterial.

:This transister's polar is PNP.

:150w power dissipation (maximum collector)

:100v base voltage (maximum collector)

:60v emitter voltage (maximum collector)

:7v base voltage (maximum emitter)

:15A maximum current (maximum collector)

:200 C is the maximum operating junction temperature.

:4MHz transition frequency.

:No noice figure.

BD140 transistor

:PNP transistor.

:-80 voltage collector emitter.

:-100v collector base voltage.

:-5 voltage emitter base.

:-1.5 Ampire collector current

:12.5 watt collector dissipation.

:250 to 40 volt direct current gaining.

:-55 to +149 C storage and operating junction temperature range.

:equal transistors are bd140g, bd231, bd238, bd238g, bd380, bd792, mje254

BC558 transistor

:PNP type transistor.

:-30v collector emitter vol.

:-30v collector base vol.

:-5v emitter base.

:-0.1A collector current.

:0.5W collector dissipation.

:dc current gain=110 to 800.

:Transition frequency=150MHz.

:2 desibell noice figure

Advantages of this circuit

This circuit is good for led strips.

And good for mini dc fans.

Disadvantages of this circuit

This circuit is not good for phone charging and not good for power banks.

Do not use for computer parts.

Comments

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