Next SINUS project??
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Re: Next SINUS project??
hailstorm thanks , i dont know if you can help me up ?
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Re: Next SINUS project??
That sounds really tightly compressed, but big bass thumps don't dip the treble end - that's exactly how split band processing is meant to work. My experimental two-band version had the option to "tune" the changeover point between bands from around 110 Hz up to about 300 Hz. Extensive listening tests suggested that between 210 and 260 Hz is the best turnover point for most content. Your choice of 250Hz is pretty good.hailstorm wrote: ↑Sun Sep 03, 2023 3:30 pm Here is my latest test of the Sinus Limiter set up as a dual band processor. An active crossover is used which splits the audio at 250Hz.
The single band version sounds great on it's own so this was only an experiment. I'd got enough PCBs to make 5 boards. However with separate bands you can tweak the mix of high and low, and have different release rates per band to suit your audio preference.
As before the source audio file is the same, no EQ or pre-processing but Soundcloud have compressed it - so ignor any digital artifacts.
I recently did a processor for AM radio, that (effectively) filtered off everything below 125 Hz, and fed it to a pretty brutal clipper. The clipper was followed by a further 125 hz lowpass filter to remove the harmonics that had been generated. The other two bands - 125 to 1250 Hz and 1250 Hz to 6500 Hz had 3: 1 compression followed by limiters, and all three bands were then recombined with a simple virtual earth mixer stage. With a bit of judicious level tweaking, the processor could make the AM station seem really loud without ever overmodulating, but also not to sound too "processed"! The frequency response was tweaked by a final lowpass filter stage to keep to within the permitted bandwidth, but the perceived audio quality wasn't "FM" quality, but certainly significantly better than most other stations on the AM band! It also had the advantage of tending to stay well above the noise floor at range. My original clients are very pleased with the results, and their listenership in their market has increased significantly - simply because they sound much better than the rest in their crowded market!
"Why is my rig humming?"
"Because it doesn't know the words!"
"Because it doesn't know the words!"
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- tower block dreamin
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Re: Next SINUS project??
Quick question , hope I have not already asked.
There are Toko 15khz filters on eBay, whilst they only have 2 pots you can turn (unlike the original ones that had three pots(, one has 7 pins the other 9, Would it be an acceptable choice ??
There are Toko 15khz filters on eBay, whilst they only have 2 pots you can turn (unlike the original ones that had three pots(, one has 7 pins the other 9, Would it be an acceptable choice ??
Sony ST 920 QS
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- tower block dreamin
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Re: Next SINUS project??
Yes Lee, I remember using the ones with 3 cores back in the day. They were 7 poles IIRC. These should work but probably fewer poles so might not be as sharp. They will need to see the right impedance on the inputs and outputs too, so you'll need to factor that into your buffering - I think they're 4k7.LeeCavanagh wrote: ↑Sat Oct 21, 2023 1:27 pm Quick question , hope I have not already asked.
There are Toko 15khz filters on eBay, whilst they only have 2 pots you can turn (unlike the original ones that had three pots(, one has 7 pins the other 9, Would it be an acceptable choice ??
One other thing, I have definitely wrecked the response of these by messing with the cores. I think they come pre-set!
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Onlineyellowbeard
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Re: Next SINUS project??
Yup don't twiddle the cores in them, they are set at the factory.
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- tower block dreamin
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Re: Next SINUS project??
Is there a list of the component for sinus limiter ?? I need to place an order , if there is a BOM that would be awesome as can just upload to mouser or farnell. Or is it cheaper elsewhere ? I do have the common caps and resistors already
Sony ST 920 QS
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- tower block dreamin
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Re: Next SINUS project??
How do I link together two mono sinus limiters for proper operation rather than just independent ?
Sony ST 920 QS
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- proppa neck!
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Re: Next SINUS project??
Link the cathodes (bar end) of D1 on each board. Loud sounds in either channel with then attenuate both channels equally, keeping the stereo image intact. However, you'll have to match the pinch-off voltages of both FETs and set the bias pretty much the same on both channels.
"Why is my rig humming?"
"Because it doesn't know the words!"
"Because it doesn't know the words!"
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Re: Next SINUS project??
Ok, great, thanks.Albert H wrote: ↑Wed Nov 01, 2023 1:05 am Link the cathodes (bar end) of D1 on each board. Loud sounds in either channel with then attenuate both channels equally, keeping the stereo image intact. However, you'll have to match the pinch-off voltages of both FETs and set the bias pretty much the same on both channels.
Sony ST 920 QS
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- big in da game.. trust
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Re: Next SINUS project??
I built a sinus limiter but R22 gets super hot when I apply power, the three LEDs come on then fade away and R22 too hot to touch so I turned it off again, any ideas? I’ve been through looking for dry joints but not sure where to go from here except maybe pull out components and ruin the board in the process ?
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- no manz can test innit
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Re: Next SINUS project??
Check if Q1 is fitted backwards, or for shorts (bad solder or failed part) on Q1 or C9tvtv wrote: ↑Fri Sep 13, 2024 1:47 am I built a sinus limiter but R22 gets super hot when I apply power, the three LEDs come on then fade away and R22 too hot to touch so I turned it off again, any ideas? I’ve been through looking for dry joints but not sure where to go from here except maybe pull out components and ruin the board in the process ?
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Re: Next SINUS project??
Hi jvok , thanks for the suggestion, I can’t see anything obvious (yet)
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- proppa neck!
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Re: Next SINUS project??
What cause this to happen.