Introduction: DC NEON VU Meter -- Easy to Make

helo all...

Allow me again to describe and post one of my DIY which I have done.
Ok let start ...

First things is to gather all of the material needed can easily find this part in local electronic component store or from your back yard (the place you use to place the old crappy thing) For me I choose this since I have a lot of junkies laying around :)

Following to this scheme (all contribute goes to the dude who has this and share this on the net)

part list of the component :

LM358 (the heart of this thing)
some resistor, capacitor and VR and also one Transistor as a main switch to drive the neon driver controller.

and as above none of above component I need to buy since I use the component from my junkies stock (lm 358 is easily to find in the audio circuit and even If you have old graphic card some times this chip is also there (in smd)

basicly this thing is convert the audio signal output (from power amp or sound output jack into variable Voltage output which later this will drive the DC NEON INVERTER

Step 1: Neon Inverter


this thing is the one I need to buy..It cost me approx 3 buck if I converted my local currency to the US.... BUT if you have the old scanner that you are not use anymore this will be the great source to gather this part.....

or ... you can build it your self with follow the schematic bellow

Step 2: ADDON Part (mini Partless Audio Amplifier)

(mini Audio Amp) this is an addon for who need to drive this thing dirrectly from the pre-amp input
TDA7052  and one VR (you may add the cap but its not crutial)
this is the one of the simplest circuit which also required almost no part.

REMEMBER : do not forget to add 3-6V voltage regulator into the V input of this chip otherwise it's will burn(you can use LM7806 which is this is the one I use)

Why I said this is an addon?
the answer is :
Further to the VU Schem above Actually this thing is ready to be fire up by its self, BUT you need to connect the input section of this controller with the output of the power amp (paralel with the wire in the Speakers)
if you add this addon, this will allow you to run this thing directly with an audio output from most device (ex . Sound jack of your PC, even from your blackberry or cell phone which have a 3.5 audio jack -- usually used for headset).

Step 3: Last Step+ Testing

and FINALLY  ... TEST and FIRE IT UP .....

need any help or others just post your command to this tread..

Good luck and never say give up to try...


visit this vidio for the result :

(sorry for the NOISY background sound... BAD device for recording)

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