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. This is 0-30V 5A variable benchtop power supply circuit, with voltage and current adjustable system. The output voltage 0-30V and a maximum current of 5A. Use LM723 as a voltage regulator designed primarily for series regulator applications. By itself, it will supply output currents up to 150 mA. So need to use two transistors 2N3055 for boost up current to 5A. There are two circuits to learn.
DC Power supply 0-30v 5A, Adjustable regulatorThis is DC Power supply 0 30v 5A, an Adjustable regulator is special that the output to 5A current. It uses LM723 DC voltage regulator IC + 2N3055 power transistor x2 to increase current up. So do the current too much than this circuit (easy circuit) To use transformer 5A, Transistor 2N3055 to Hold Heatsink, VR1-5K to ADJ Volt Output.
Circuit Diagram of Variable Regulator 0-30V 5A using LM723 and 2N3055 x 2 Note: I am sorry that tell you. I never build this circuit. So, I cannot confirm it works. If you are looking for 0-30 variable power supply. I recommend this circuit better. It tested. Also, You can increase current up to 5A with adding a transistor like this. We do not offend you, In this Power supply circuit 0-30V 5A is adapted to the work This circuit is still the principle original everything. Just only changes the current limiting circuit. by use the resistors 0.1ohm 5W two pieces for the parallel, to be able to withstand loads as wanted. We should not forget, use the resistor size 0.1Ω 5W amounting 2 pieces to parallel each other You may also like these: Parts you will needIC1: LM723 To create just operators device in a PCB form and then to make correct completed is available. Without you have adjusting customized at any the circuit.
Note: This is so the old circuit. 0-50V 3A Variable power supply0-30V 0-5A variable supply with current adjustableThis circuit is better than the above circuit. Because use CA3140 for Control Current and Voltage output in easily. And full overload protection.
Note: This circuit is not suitable for the beginner. It is best for professional only. How it worksIn the 0-30V 5A regulator circuit below. It uses a precision voltage regulator system.
Note: I am sorry that tell you. I never build this circuit. So, I cannot confirm it works. If you are looking for 0-30 variable power supply. I recommend this circuit better. It tested. Also, You can increase current up to 5A by adding a transistor-like this. This circuit has 2 unregulated power supply, 43V, and 24V. They power a positive voltage to a collector of two power transistors, 2N3055. Both transistors are connected in parallel to increase the high current to the output load. But in the beginning, 2N3055 does not conduct. Because they need to biased current from Q3-BC337 first. So, we need to have another rectifier. 24V rectifier This is a power supply for a control voltage regulator system. To begin with, we rectify the 18VAC from the transformer into 24V DC using a D3-diode and C5-filter capacitor. Then, the 24VDC comes to resistor-1K to power to pin 12(V+) and pin 7 (V-) of LM723. While the 24VAC also powers CA3140 op-amp IC at pin 7(V+) and pin4 (V-). This is a limiting current system of this circuit. When the 24VDC flows through 1K resistor pin 11 (VCC) of IC1. It makes the transistor inside can supply voltage output of pin 9. So, there is a voltage to bias the base of the Q3 transistor. It is working to conduct current from 24VDC through resistor 200Ω 1W to C-E of that transistor. It results in both transistor 2N3055 get a biased current. So, they can power the current to the output.
Block diagram inside LM723 Look at in the block diagram inside uA723. This voltage can be controlled by comparing the voltage pin 4 and pin 5. Which both inputs of op-amp have 2 pins. Pin 5 is non-inverting and Pin 4 is inverting. For pin 6 act as set the reference voltage. If you want to change the output voltage. You change the voltage at pin 4 and pin 5. In this circuit, we should choose to adjust the voltage at pin 5. Because it controls the voltage in a linear positive. If the pin 5 voltage rises up. It makes the output pin 9 is positive up. Of course, there is a lot of biased currents. Which we can rotate the potentiometer 50K to adjust the output voltage 0-30V in normal and 5K in fine adjusting. You may also like these: Limited current How it works?—We use a comparing voltage between pin 2 and pin 3. When the transistor Q1 works over current than normal. Then, pin 3 will compare the voltage with pin 2. It makes the positive voltage out of pin 6 to bias the base of BC549. Then, BC549 pull the voltage at pin 13 of LM723 down and no output voltage. This circuit safe. Parts you will needs 0.5W 5% resistors Except special Electrolytic Capacitors How it buildsFirst of all, we should get all the components on the lists below. Then, get the PCB. You can also use a perforated board. Look at the PCB layout and the components layout.
Warning! This circuit is not suitable for newbies. You can look at 0-50V 3A Variable power supply Sharing is caring! Related Posts    GET UPDATE VIA EMAILI always try to make Electronics Learning Easy. Thank you!You have successfully joined our subscriber list. |
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