mus1k_freak
Well-known member
almost ordered a pair of these last night, can anyone comment on how they sound/work? would be fun to stick in a 500 module
ungifted said:3nity
That guy is me. Please let me know how it goes. Thank you!
Tekay
Yes LM393 is not dual opamp, but I've seen both versions (THAT DN with LM393, and redrawn design with TL072).
I'll try to find some time to return to process...
ungifted said:Still no lucky with attack/release mod. It's not stable. I'll try to make new design if i find more time...
But i've got updated docs for the basic pcb (interconnections added).
ungifted said:Still no lucky with attack/release mod. It's not stable. I'll try to make new design if i find more time...
shot said:ungifted said:Still no lucky with attack/release mod. It's not stable. I'll try to make new design if i find more time...
I've built attack/release mod using the pico schematic. That's the one without 2sk170, using three 3904 and 3906's and I've used one TL074. It worked without problems. I can post my pcb layout but it's not that clever and neat as your board layouts. It's for self etching so it has a lot of bridging wires on the bottom. Ugly but it works.
I wouldn't obsess over the attack/release circuit.
mus1k_freak said:can anyone comment on how they sound/work? would be fun to stick in a 500 module
shot said:This is Ungifted's thread and his build. Since he already started working on AR board, I believe it would be unfair if I post my layout without his consent. And also, it is built using Pico's schematic as a reference so it's not ok to post it's schematic here. You know that Pico stuff is forbidden...
hazel said:I still don't installed gain reduction meter but listening to loop-back recording through audio interface i confess i have to squash audio to start listening artifacts. The overall result is smooth almost "invisible" compression.
emrr said:If you never heard a Pico does it matter? Many things using the 4301 are going to be close to the app notes, there's a whole list of similar 4301 compressors on the market.
hazel said:(...), it's well known that 4301 goes faster as you hit it harder at input
hazel said:it's well known that 4301 goes faster as you hit it harder at input
emrr said:hazel said:it's well known that 4301 goes faster as you hit it harder at input
Never heard it, and strongly doubt it. Not a thing I have heard in years of use, not a thing I see in the circuit. Maybe if you overload it so it's clipping transients? It does have a window for best operation between -30 and +20 dBr with detector law beginning to change outside of those ranges, and detector output vs. frequency is rolled off in the treble increasingly below -10dBr.
The log-domain filter cutoff frequency is usually placed well below the frequency range of interest. For an audio-band detector, a typical value would be 5 Hz, or a 32 ms time constant (τ). The filter’s time constant is determined by an external capacitor attached to the CT pin, and an internal current source (ICT) connected to CT. The current source is programmed via the IT pin: current in IT is mirrored to ICT with a gain of approximately 1.1. The resulting time constant τ is approximately equal to 0.026 CT/IT.
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