When I builds the circuit Pre tone control by IC LF353 the finished , but can not be usable. Because of it wants a power supply +15V GND -15V at 500mA current. I pairs then builds the group Dual DC power Supply +15V,GND,-15V. By use pillar equipment be IC 7815 , for +15V and […]
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Power supply regulator +15V -15V 1A by IC 7815 & 7915
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My first Variable DC Power Supply 1.2V to 30V 1A by LM317
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Diy digital voltmeter panel meter 0-50V
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0-50V 3A Variable DC power supply
Figure 1 The circuit diagram of 0-50V 3A Variable DC power supply
The R1, R2 will functions for limitting overcurrent by works together with TR1, TR2. When the current exceeded TR1 and TR2 will work, and will have output voltage out of E lead of TR2 through LED1 into 2 pin of IC1. So cause the circuit stop provide voltage. The switch-SW1 will functions in reset system to restart working of circuit again.
How to builds
This project have quite many components. You should experience a modest electronic.I am sorry for this project not have a PCB layout. But you can use the perforated PCB. As components layouts in Figure 2
Figure 2 The components layout and wiring
Mounting transistor to heatsink.
This project we use the 2SC5200 transistor to the heatsink as Figure 3 since when too much current load 2SC5200 it too heat. So must mount the large size heatsink. As Figure Proper way of mounting the transistor in a heatsink. Using hex nut and metal screw to mount them together by use mica insulator to protect short circuit.
Figure 3 The mounting the transistor on the heatsink.
Connecting the transformer.
If you want to use output voltage are 0-50VDC can connect 18,24 terminal. The output 0-30VDC can connect 0,24 terminal and The output 0-20VDC can connect 0,18 terminal.
Figure 4 connecting wrong polarity voltage is low
But I cannot buy the transformer as Figure 4 so use 2 transformers to connected with 0-18V and 0-24V in series. If you connected the wires is 5VAC as Figure 4. It means that, you connect the transformer wrong. Must return a new polarity wire. We will read voltage about 43V.
Eventually we will have a successful circuit of Figure 5.
Figure 5
Testing
Connect the transformer as shown in Figure 2 by a coil of a transformer to match our needs. Then measure the voltage at OUT. Supply power to transformer to observe that the meter, will need to measure the voltage from 0-50V by adjusting the VR1.
As Video below.
The repairing
As the circuit is a device that is not much. So in most cases Why the PCB is often caused by wearing the wrong device position and soldering. When the circuit is not working, might be the position. Make sure that all the various solder points.
The components list
Semiconductors
1. LM723_____High precision voltage regulator = 1 pcs.
2. TR1_______BF423____PNP transistor_________= 1 pcs.
3. TR2,TR3___BF422____NPN transistor_________= 2 pcs.
4. TR4_______BD140____PNP transistors________ = 1 pcs.
5. TR5_______2SC5200__NPN transistors________= 1 pcs.
ZD1__________36V 0.5W Zener diode___________ = 1 pcs.
D1-D4________1N5401____3A 100V Diode______ = 4 pcs.
LED1,LED2____LED 3 mm as you want__________ = 2 pcs.
Resistors
R1,R2_______0.1 ohms 2W____________________= 2 pcs.
R3__________56 ohms 0.5W___________________= 1 pcs.
R4,R10__________100K 0.25W ____________________ = 2 pcs.
R5,R8,R20_______10K 0.25W____________________ = 3 pcs.
R6,R22,R23______1K 0.25W______________________= 3 pcs.
R7__________15K 0.25W_____________________ = 1 pcs.
R9__________2.7K 0.25W____________________ = 1 pcs.
R11,R12______5.6K 0.5W____________________ = 2 pcs.
R13,R17_______8.2K 0.5W_____________________= 2 pcs.
R14,R15,R16__10K 0.5W_____________________ = 3 pcs.
R19__________330 ohms_____________________ = 1 pcs.
VR1_________10K potentiometer_______________ = 1 pcs.
Ceramic capacitors
C6_______470pF 50V________________________ = 1pcs.
Mylar Capacitors
C2,C7_____0.1uF 100V________________________ = 2 pcs.
Electrolytic capacitor
C1________2200uF 63V__________________________ = 1 pcs.
C3________47uF 50V__________________________ = 1 pcs.
C4,C5_____10uF 50V__________________________ = 2 pcs.
C8_______100uF 63V___________________________ = 1 pcs.
SW1_____Reset switch normally open pushbutton______ = 1 pcs.
PCB,wires,heatsink,nut,screw,and other.
Note:
I am sorry for who need to look for the PCB layout but I do not have them because I buy the electronic circuit Kits.
If you like this project you can buy at
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