Showing posts with label Adaptor. Show all posts
Showing posts with label Adaptor. Show all posts
rangkaian adaptor 12 volt 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.
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Rangkaian Adaptor 12 volt 2N3055
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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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Rangkaian Adaptor 12 volt 2N3055
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2N3055
Variable Adapter
Variable Adapter (3 , 4 ,5 ,9 ,12 ,16 ,20 to max 37 volt)
The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 1.5A over a 1.2V to 37V output range. They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. Also, the LM117 is packaged in standard transistor packages which are easily mounted and handled. In addition to higher performance than fixed regulators, the LM117 series offers full overload protection available only in IC's. Included on the chip are current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected. Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed. An optional output capacitor can be added to improve transient response. The adjustment terminal can be bypassed to achieve very high ripple rejection ratios which are difficult to achieve with standard 3-terminal regulators. Besides replacing fixed regulators, the LM117 is useful in a wide variety of other applications. Since the regulator is “floating” and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., avoid short-circuiting the output. Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment pin and output, the LM117 can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1.2V where most loads draw little current. For applications requiring greater output current, see LM150 series (3A) and LM138 series (5A) data sheets.For the negative complement, see LM137 series data sheet.
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Variable Adapter
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Variable adaptor Gamabr skema Rangkaian Adaptor Variable 1.2 - 37 Volt to set the output you can use the formula below. or with a set 5k VR, the output 1.2 volt anad smallest maximal 25 volt.
Features Adjustable Regulator LM117/LM317A/LM317 Guaranteed 1% output voltage tolerance (LM317A) Guaranteed max. 0.01%/V line regulation (LM317A) Guaranteed max. 0.3% load regulation (LM117) Guaranteed 1.5A output current Adjustable output down to 1.2V Current limit constant with temperature Pa Product Enhancement tested 80 dB ripple rejection Output is short-circuit protected.
.Table LM117/LM317A/LM317.
12 volt dual voltage of adapter
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12 volt dual voltage of adapter 1
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Transformator 18v-CT (min) Capasitor 35v Bridge Rectifier 2 Ampere /100 v c4, c5 Ceramic 12 VOLT 20 Ampere of adapter
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12 volt dual voltage of adapter 2
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Using a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to 20 amps
RANGKAIAN ADAPTOR DUAL REGULATOR - 12 VOLT GRN + 12 VOLT
Transformer T1 steps down the AC mains voltage and diodes D1, D2, D3 and D4 does the job of rectification. Capacitors C1 and C2 does of filtering.C3, C4, C7and C8 are decoupling capacitors. IC 7812 and 7912 are used for the purpose of voltage regulation in which the former is a positive 12V regulator and later is a negative 12V regulator. The output of 7812 will be +12V and that of 7912 will be -12V.
Skema rangkaian Dual Regulator Power Supplay
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RANGKAIAN ADAPTOR DUAL REGULATOR
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