LED meter

[warpie]

Vin =1.4Vrms @ 10kHz

 

[PRR]

> Do you have any higher resolution pic by any chance?

Get a comfy chair and use the SEARCH.

There is more than a book's-worth of meter ideas on this forum.

One hit is page 2 of this thread. But there's lots more.

 

[warpie]

There is more than a book's-worth of meter ideas on this forum.

I must have read back and forth every single one. In fact, I just finished drawing the (b192) neve ppm schematic and there seems to be a significant amount of DC at the output. I'm also not sure how I can make it work with the 339s. Abbey's example is simpler (i.e less components) but I believe it somehow has limited headroom, which probably can be adjusted. Saying that, I don't know how it compares to the neve one.

 

[warpie]

FWIW, here's the neve with 1.4Vrms @ 1kHz

 

[abbey road d enfer]

Thanks Abbey. I joined your two schematics and the simulation gave me the following plots. Do they look correct?

I will breadboard it but I'd like to come as close as possible to the final version because ordering the components and mainly the shipping costs is a bit of an issue and ideally I'd like to place one order for everything.

Vcc = +24V

You must take R5 off and increase VR1 to 100k.

 

[warpie]

Thanks abbey, I'll try this.

 

[abbey road d enfer]

Thanks abbey, I'll try this.

I forgot to mention a couple of caveats.
The circuit works only for levels below about 2 Vrms; you need an attenuator/trimmer there.
The diode rectification is not a linear process, in particular, low levels will be ignored; it may be beneficial using Schottky diodes.