This is Version 1 of the VU meter which i have planned to built …The final version will be different from the present one as its performance did not meet requirements ..
This version cost me about 100₹ …The IC lm 3915 was particularly hard to find at Sp road,Banaglore …eventually got it after a exhausting day of search ..Thanks to my friend Ravindra hegde for accompanying me in the IC hunt 😉 😉 Thanks buddy!!
Back to business …here is the part list along with the price
- IC lm3915 – 75₹
- 10 leds – 10₹
- 10k ohm pot – 2₹
- Resistors 390 ohm and 1k ohm – 1₹
- Wires – 5₹
Here is the schematic of the circuit –
Yes i know its a hand written one but i didnt have the patience to get a proper schematic done.
I have used a 1k ohm resistor to limit the current flow through the leds (this is not shown in the ckt diagram)
Here is a pic of the circuit which i built on a bread board :
This is a video of the VU meter in action
The video quality sucks !! thanks to the bad video converter i use …. 😦
UPDATE : Check this post before implementing this circuit .
The inspiration for this circuit was from a spanish site taringa.net …gracias a ustedes!!! 🙂