Using the picocompressor GR meter as a micpre meter
- Thread starter drpat
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SSLtech
Well-known member
(sigh)
I dunno...
You lay out a project to share that already has everything, and everyone still wants to do it themself...
What it this? -A Do-It-Yourself forum or something?
Keith
I dunno...
You lay out a project to share that already has everything, and everyone still wants to do it themself...
What it this? -A Do-It-Yourself forum or something?
Keith
peterc
Well-known member
Slightly O/T but I'm always looking for a meter IC that does more than 30dB of range! When doing the Green pre, I opted for a design that used an LM339 quad comparator to get more than 50dB of range. This turned out to be rather more complex than I initially wanted (about 40% of the board is meter circuitry) but I could not find a chip that came close.
My thoughts are to make the top LED peak at +20 dB which is a common max level for a lot of DAW's today. The lowest LED should light at -30dB, really a "signal present" indicator.
The Hamptone comp uses a PIC for the meter, but there are no markings on the front panel, so I could not see the range. Is this a viable alternative method to get greater range than the LM3914/5/6 stalwarts?
Peter
My thoughts are to make the top LED peak at +20 dB which is a common max level for a lot of DAW's today. The lowest LED should light at -30dB, really a "signal present" indicator.
The Hamptone comp uses a PIC for the meter, but there are no markings on the front panel, so I could not see the range. Is this a viable alternative method to get greater range than the LM3914/5/6 stalwarts?
Peter
hooking up a small processor with an ADC to read the size of the signal and display shohuld be relatively easy.
I'm no expert, but using a standard audio dac shohuld give you enough precision for at least 96dB (using a 16bit ADC). I would suggest in software then doing a low pass filter on the meter, otherwise the LED's will flicker so quickly, they will be unviewable.
I would use a 44.1KHz ADC if I was you, just so you can catch the whole audio range. Technically, you could then add an S/PDIF output to the Pre relatively easily
I can help with the digitial side if you like, however, I'm useless when it comes to code
I'm no expert, but using a standard audio dac shohuld give you enough precision for at least 96dB (using a 16bit ADC). I would suggest in software then doing a low pass filter on the meter, otherwise the LED's will flicker so quickly, they will be unviewable.
I would use a 44.1KHz ADC if I was you, just so you can catch the whole audio range. Technically, you could then add an S/PDIF output to the Pre relatively easily
I can help with the digitial side if you like, however, I'm useless when it comes to code
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