Hello all,
I’ve been working on putting the Level-loc circuit onto a 500-series card with a few added extras.
My principle want for the circuit is for it to be used in mixing or after a mic pre so I’ve simply omitted the I/O transformers, used INA134 and DRV134 for I/O and padded down the input (initially with a 40dB pad) later a 30dB pad (still undecided).
Quick overview of what I have (probably incorrectly) done:
Primarily I have assumed that this would never be used as a HIFI solution, therefore the bypass is not ‘true-bypass’ as in – it passes through the INA/DRV chips whatever happens. The bypassing is done with the unbalanced signal and controlled by relay. The circuit initially ran off a 9v supply so I have replicated this here using a 7809 off the +16v supply. I also only have the basic version of Eagle so I've put it on to a 160mmx100mm board.
So after some laying-out and some double checking I made up the proto using the toner-transfer method and some FCl:
But I also want a mix/blend control – I have recently made a splitter-blender for bass guitar so I whacked that on the input/output to then realise that the output is phase inverted so I made a quick change to invert the ‘send’ element and breadboarded the revised blender:
In faffing with the circuit I have also tried a pot in place of the ‘distance’ switch (which I guess works just like a threshold) but the switching as it was worked really nicely – so why fix what ain’t broke?
Anyway I figure an HPF on the input (pre-compressor) may be useful so I’ve tacked on a simple RC filter (10k/100nF -160hz?). I also thought an LPF would also be useful so, similarly I tacked on another arbitrary RC filter (this example was 10k/6n8) to the output (post compressor) to tame any top end so it can be blended back ‘underneath’ the dry.
I also read about changing the release time – ‘when in Rome’ right? – so I used the faster value of 1uF and added a 2uF in parallel to slow it down a bit.
There are some sound clips here:
https://soundcloud.com/minoian/sets/lvl_lok-500
So far I'm happy with the progress and once I've updated the basic schematic to include the blend and other circuit mods I'll upload it here. I'm clueless when it comes to circuit element interaction so these separate elements have literally just been put together without any real consideration. Once I've uploaded the schematic I would be delighted if others would provide some constructive criticism...
On a massively more important note : - I've not decided on a name yet... 'LVL_LOK-500' is my current reference...
Ian
8)
I’ve been working on putting the Level-loc circuit onto a 500-series card with a few added extras.
My principle want for the circuit is for it to be used in mixing or after a mic pre so I’ve simply omitted the I/O transformers, used INA134 and DRV134 for I/O and padded down the input (initially with a 40dB pad) later a 30dB pad (still undecided).
Quick overview of what I have (probably incorrectly) done:
Primarily I have assumed that this would never be used as a HIFI solution, therefore the bypass is not ‘true-bypass’ as in – it passes through the INA/DRV chips whatever happens. The bypassing is done with the unbalanced signal and controlled by relay. The circuit initially ran off a 9v supply so I have replicated this here using a 7809 off the +16v supply. I also only have the basic version of Eagle so I've put it on to a 160mmx100mm board.
So after some laying-out and some double checking I made up the proto using the toner-transfer method and some FCl:
But I also want a mix/blend control – I have recently made a splitter-blender for bass guitar so I whacked that on the input/output to then realise that the output is phase inverted so I made a quick change to invert the ‘send’ element and breadboarded the revised blender:
In faffing with the circuit I have also tried a pot in place of the ‘distance’ switch (which I guess works just like a threshold) but the switching as it was worked really nicely – so why fix what ain’t broke?
Anyway I figure an HPF on the input (pre-compressor) may be useful so I’ve tacked on a simple RC filter (10k/100nF -160hz?). I also thought an LPF would also be useful so, similarly I tacked on another arbitrary RC filter (this example was 10k/6n8) to the output (post compressor) to tame any top end so it can be blended back ‘underneath’ the dry.
I also read about changing the release time – ‘when in Rome’ right? – so I used the faster value of 1uF and added a 2uF in parallel to slow it down a bit.
There are some sound clips here:
https://soundcloud.com/minoian/sets/lvl_lok-500
So far I'm happy with the progress and once I've updated the basic schematic to include the blend and other circuit mods I'll upload it here. I'm clueless when it comes to circuit element interaction so these separate elements have literally just been put together without any real consideration. Once I've uploaded the schematic I would be delighted if others would provide some constructive criticism...
On a massively more important note : - I've not decided on a name yet... 'LVL_LOK-500' is my current reference...
Ian
8)