DIY VU meter using LM3914 ic
This things are required to make this amplifier.........
1. 10×5mm/3mm Led.........https://amzn.to/31bzIiv
2. 1×LM3914N-1 ic..........https://amzn.to/2Ycwcax
3. 1×1.5k resistor 1/4w.........https://amzn.to/2MmUvv1
4. 1×100k resistor 1/4w.........https://amzn.to/2Y7wkrE
5. 1×560Ω resistor 1/4w.........https://amzn.to/2MtQYuS
6. 1×4.7uf capacitor..........https://amzn.to/31164vX
7. 1×4k7 preset........https://amzn.to/2YchFeP
8. 1×SPST push button..........https://amzn.to/2GD8w4i
Watch this video for better understanding
circuit diagram
In this post I make Led VU muter. Now watch the circuit diagram and follow my steps for make this
VU muter. First you need LM3914N-1 ic. Connect 10 pieces led's cathode (-) pin to ic,s 1,18,17,16,15,14,13,12,11,10 no pin. frequency start 1 no pin and end 10 no pin. Then short ic's 2,4,8 no pin by a wire for gnd. Then connect a 1.5k resistor with ic's 7 no pin to gnd. Then connect a 560 Ω resistor with ic's 5 no pin. Then connect a 100k resistor with the 560 Ω resistor. And then connect this 100k resistor with gnd. Then connect 4.7uf capacitor (+) between 560 Ω resistor and 100k resistor, and capacitor (-) connect with gnd. Then connect a IN4148 zener diode(-) with 4.7uf capacitor(+), and zener diode (+) pin is audio input signal. Then you need a 4.7k preset for frequency gain control. Connect this 4.7k preset's output pin with ic's 6 no pin. Then short all Led's anode (+) pin by a wire. Then connect this wire with preset right side pin and ic's 3 no pin,. And preset left side pin connect with gnd. Then you ned a SPST push button for Dot and Bar mode. Connect this SPST push button with ic's 3 no pin and ic's 9 no pin. Now your circuit is ready.
*ic's 3 no pin is power supply pin. for power supply 9 - 12 volt DC.
*zener diode (+) pin for audio input signal. audio input signal upto 3.7 volt.
Thank you,
Technical Mriganka.........
2 Comments
I need pcb layout this diagram.. Please give us pcb layout
ReplyDeleteyes please give us pcb layout
ReplyDelete