Showing posts with label 2N3055. Show all posts
Showing posts with label 2N3055. Show all posts
Friday, October 17, 2014
2N3055 and LM723 Power Supply 13 8Volt 10Amp circuit
My Friend want circuit power supply for VR.
I Find Website many, See to this Web http://www.rason.org
Good Site circuit.
This is circuit Power Supply 13.8 Volt 10 Amp by LM723 .
Detail ::
This circuit uses the LM723 IC which gives us excellent voltage regulation. The circuit uses 3 pass transistors which must be heat sinked. Resistor R9 allows the fine tuning of the voltage to exactly 13.8 volts and the resistor network formed by resistors R4 through R7 controls the current limiting. The LM723 limits the current when the voltage drop across R5 approaches .7 volts. To reduce costs, most commercial units rely on the HFE of the pass transistors to determine the current limiting. The fault in that system is that the HFE of the pass transistors actually increases when the transistors heat up and risks a thermal runaway condition causing a possible failure of the pass transistors. Because this circuit samples the collector current of the pass transistors, thermal runaway is not a problem in this circuit making it a much more reliable power supply.
I Find Website many, See to this Web http://www.rason.org
Good Site circuit.
This is circuit Power Supply 13.8 Volt 10 Amp by LM723 .
Detail ::
This circuit uses the LM723 IC which gives us excellent voltage regulation. The circuit uses 3 pass transistors which must be heat sinked. Resistor R9 allows the fine tuning of the voltage to exactly 13.8 volts and the resistor network formed by resistors R4 through R7 controls the current limiting. The LM723 limits the current when the voltage drop across R5 approaches .7 volts. To reduce costs, most commercial units rely on the HFE of the pass transistors to determine the current limiting. The fault in that system is that the HFE of the pass transistors actually increases when the transistors heat up and risks a thermal runaway condition causing a possible failure of the pass transistors. Because this circuit samples the collector current of the pass transistors, thermal runaway is not a problem in this circuit making it a much more reliable power supply.
Sunday, October 5, 2014
2N3055 TIP41 CA3140 Lab Power Supply 0 30V 2A
This is the schematic of the 30V/2A power supply I use in my own lab.It may look very complex, but it really isn’t very difficult to understand: it uses only the knowledge we’ve learned in the previous lessons.
The top part looks like the power supply we built in Lesson 7: the transformer L1 transforms the outlet voltage to a safe 30V, which is rectified by bridge rectifier G2 and smoothed by capacitor C5. Transistors T3 and T6 form a darlington transistor. This darlington replaces transistor T1 in Lesson 7. However, the base voltage is not controlled by a simple potmeter, but by an ‘electronic potmeter’ with voltage feedback. The advantage of this feedback is a load-independent output voltage.
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