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Ditulis Oleh : YK69 Elektro
Judul : Adaptor 12 volt menggunakan 2n3055

Adaptor 12 volt menggunakan 2n3055

Rangkaian Adaptor 12 volt 2n3055

This adapter circuit can deliver up to 3A at 12V output voltage. The circuit can be employed on occasions when a current of more that 3A is demanded for regulator. IC regulators of such high current rating are pretty hard to find.

The transformer T1 steps down mains voltage, to 12rms & the rectifier bridge D1 rectifies it to produce a DC voltage. The C1 filters the rectifier output and produces a DC level. The series pass transistor Q1 (2N 3055) is biased by resistor R1 (680Ω). Since zener diode D1 is under breakdown region the voltage across it will be 12V. So the total output voltage will be steady 12.7 V(theoretically). That is the zener voltage plus base emitter voltage of Q1.Here transistor Q1 will conduct the excess current required .

Skema rangkaian adaptor 12 volt 2N3055

Notes.

• If 12V zener is not available ,use the nearest value.
• The transformer T1 can be as 23oV primary;15V/5A secondary step down transformer.
• The capacitors must be rated at least 25V.
• By changing the value of the Zener diode, different output voltages can be obtained from the circuit.

The 2N3055 is a silicon Epitaxial-Base Planar NPN transistor mounted in Jedec TO-3 metal
case. It is intended for power switching circuits, series and shunt regulators, output stages and high fidelity amplifiers.

Maximum Ratings

• Collector-Base Voltage 100 V
• Collector-Emitter Voltage (RBE £ 100W) 70 V
• Collector-Emitter Voltage (IB = 0) 60 V
• Emitter-Base Voltage (IC = 0) 7 V
• Collector Current 15 A
• Base Current 7 A
• Total Dissipation at Tc £ 25 oC 115 W
• Storage Temperature -65 to 200 oC
• Operating Junction Temperature 200 oC

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,Adaptor 12 volt menggunakan 2n3055 xxx .

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