Simple dB meter driver circuit.

[electronics_shamim]

Sirs,

Does anyone have complete schematic or part list required for a simple dB meter driver built around transistor/IC?

Regards,
Shamim-India.
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[audioguru2]

Here is a pretty good VU meter made with an LM3916 IC. I made some similar circuits with an LM3015 IC instead that displays 3dB steps. The datasheet shows how to cascade two ICs for a 60dB range.

EDIT: OOps. Here it is:

 

[electronics_shamim]

Dear Audioguru,

thanks for your immediate response. You have sent me the vu meter built around (LEDs). The circuit i need is different.

I mean to say that after the pre-amplifier out, it should be connected and the vu meter  called db meter has the needle deflection, not LEDs.

I hope you understand by now. However, I appreciate your immediate response and guidance.

Regards,
Shamim_India.
====

 

[audioguru2]

Hi Shamin,
I have not seen a dB meter with a needle for about 30 years.

 

[electronics_shamim]

Sir,

I hope I have not clarified properly. Now to be clear I state like this:

Like in an analogue multimeter (the needle deflects, in terms of ohms measurement, voltage etc.). So, a dB meter or the so called vu meter is also like that, in which the needle deflects (dancing) in rythms in relation to the speaker sound. For each channel it is there in the front panel top right hand side mounted unto the tape deck.

I hope this time i have clarified you properly. Hope to receive a reply this time.

With regards,
shamim

 

[audioguru2]

I haven't seen a tape deck for about 15 years. My cassette deck had LED VU meters.

 

[MP1]

Shamim,
Are you looking for something like this?
(click on the picture to enlarge it.)

MP

 

[audioguru2]

The meter circuit posted by MP is a frequency meter, not a VU dB meter.
A VU meter shows audio levels, not the frequency of a tone.

 

[RDL2004]

Maybe this will be of help:

http://sound.westhost.com/project55.htm

Analog meters have not totally disappeared, for example:

http://www.mcintoshlabs.com/mcprod/shopdisplayproducts.asp?hid=1&id=14&cat=Power+Amplifiers&prodid=1028&product=MC602

 

[electronics_shamim]

Sir,

The reply posted by RDL2004 is the exact one which I wanted. A simple vu meter depicted therein by use of diodes is also fantastic. I wish to extend my sincere thanks to him for the efforts made to post me the same.

Thanks again with regards,
shamim_india.
===

 

[MP1]

The meter circuit posted by MP is a frequency meter

Ooops! Sorry about that Shamim. I attached the wrong drawing when posting. Thanks to RDL2004, it looks like you have what you are looking for. It is still simpler than the one I meant to post. Best of luck with your project!

MP

 

[electronics_shamim]

Sirs,

I wish to have still more simpler db/audio peak level meter which can be interfaced just at the output of of pre-amplifier wired around BC148, which I had seen some years back, but I do not have the Circuit. Any idea pls.? However, I am very thankful to RDL2004, who has guided me properly.

Thanks to Audioguru, who has been always kind to extend help.

Thanks to MP who keeps me updated on immediate response.

Regards,
Shamim_India.

 

[MP1]

Shamim,
I do not think you will find one simpler than the design with diodes that RDL posted. Still, with this one you do not have very good accuracy.

MP