Hello Guys ... !
I'm assigned to complete an electronics project named 'Variable DC Power Supply Using LM317T With LED Indication Of Voltage Levels' ...
Max. Output: 15 VDC
Max. Current: 1 Ampere
IC Allowed: LM317T Only
Output Range: 0V to 15V (In steps of 3V ... i.e. 0V, 3V, 6V, ... , 15V)
Using a transformer of 220/24 VAC (1 Ampere), I stepped down the input ac voltages ...
Using 4 diodes (1N4007), I successfully rectified ac input signal ...
What should be the value of filter capacitor, if the maximum voltage required at output is 15 VDC and maximum current allowed is 1 Ampere ... ?
I've used a capacitor of 1000 uF/50 V, it works fine, if I'm using 15 VDC at output and using a maximum of 100 mA current ... Would it work fine if current at output is 1 A ... ?
My LM317T is working fine ... I've regulated voltages required at output ... (Remember my output is: 0V, 3V, 6V, 9V, 12V, 15V ...
Now, my second and last question ...
I've to display the output voltage level using LEDs ... That is, if output from LM317T is 0V, there shouldn't be any glowing LED (indicating 0V) ... If output is 3V, there must be 1 LED glowing so as to represent 3V visually ... Similarly, if output is 6V, 2 LEDs must be glowing ... If output is 9V, 3 LEDs must be glowing ... If it's 12V, 4 LEDs ... And if it's 15V, 5 LEDs must be glowing ... !
In short:
OUTPUT / LEDs Glowing
0V / 0 LEDs
3V / 1 LED
6V / 2 LEDs
9V / 3 LEDs
12V / 4 LEDs
15V / 5 LEDs
I'm unable to make a circuit with 5 LEDs, sensing voltage levels and displaying on LEDs ... Please, tell me how can I make a circuit, that would visually be displaying output voltage ... ?
P.S. Ripple factor allowed is 3% ... I can only use ZENER diodes ... I cannot use any ICs for sensing voltage levels ... (I'm restricted to use simple electronics for indication from University) ... Help me out ... Please ...
I'm assigned to complete an electronics project named 'Variable DC Power Supply Using LM317T With LED Indication Of Voltage Levels' ...
Max. Output: 15 VDC
Max. Current: 1 Ampere
IC Allowed: LM317T Only
Output Range: 0V to 15V (In steps of 3V ... i.e. 0V, 3V, 6V, ... , 15V)
Using a transformer of 220/24 VAC (1 Ampere), I stepped down the input ac voltages ...
Using 4 diodes (1N4007), I successfully rectified ac input signal ...
What should be the value of filter capacitor, if the maximum voltage required at output is 15 VDC and maximum current allowed is 1 Ampere ... ?
I've used a capacitor of 1000 uF/50 V, it works fine, if I'm using 15 VDC at output and using a maximum of 100 mA current ... Would it work fine if current at output is 1 A ... ?
My LM317T is working fine ... I've regulated voltages required at output ... (Remember my output is: 0V, 3V, 6V, 9V, 12V, 15V ...
Now, my second and last question ...
I've to display the output voltage level using LEDs ... That is, if output from LM317T is 0V, there shouldn't be any glowing LED (indicating 0V) ... If output is 3V, there must be 1 LED glowing so as to represent 3V visually ... Similarly, if output is 6V, 2 LEDs must be glowing ... If output is 9V, 3 LEDs must be glowing ... If it's 12V, 4 LEDs ... And if it's 15V, 5 LEDs must be glowing ... !
In short:
OUTPUT / LEDs Glowing
0V / 0 LEDs
3V / 1 LED
6V / 2 LEDs
9V / 3 LEDs
12V / 4 LEDs
15V / 5 LEDs
I'm unable to make a circuit with 5 LEDs, sensing voltage levels and displaying on LEDs ... Please, tell me how can I make a circuit, that would visually be displaying output voltage ... ?
P.S. Ripple factor allowed is 3% ... I can only use ZENER diodes ... I cannot use any ICs for sensing voltage levels ... (I'm restricted to use simple electronics for indication from University) ... Help me out ... Please ...
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