Simple DiodeBridge Compressor

[richiyobs]

3 different approach simulated
which is the better one?
thanks for your attention

 

[abbey road d enfer]

How often do we encounter gear with unbalanced inputs? Even the cheapest home recording equipment nowadays has balanced inputs. As far as I know pro audio equipment has always had balanced inputs. Only gear with unbalanced inputs I have used have been tape recorders for home/semi pro use.

You never had a shorted connection? Particularly if there's a patchbay involved, you can chase your tail for hours wondering why you have reduced level and distortion.

Distortion if one of the output pins is grounded and no problem at all if left floating.

If left floating you loose 6 dB and you need to modify your wiring, which always happen when you're busy and you lift the wrong leg...

 

[richiyobs]

Looks like that with the attached schem... I found what I need...
Only 0.4dB loss if used unbalanced
I ll simulate it to check
Best
Richi

 

[richiyobs]

3 Opams config as modern ic

 

[Script]

Why not just use a dedicated line driver as suggested earlier ? Saves a lot of hassle (layout, real estate, matching), gives you better performance, and is competitive in cost.

 

[richiyobs]

Hi Script you re right... It s the lack of money... And as I said still have few ne5532 and TL to use

 

[richiyobs]

I also did a 33609 pcb but before drilling the huge single sided board I realized It was to expensive to build... That s why I started a simplified one, with components I just own

 

[abbey road d enfer]

I also did a 33609 pcb but before drilling the huge single sided board I realized It was to expensive to build... That s why I started a simplified one, with components I just own

Building a clone of an existing piece will teach you little, when building something with limited resources will tell you a lot; the road is twisted, though...

 

[richiyobs]

Here is the huge one...
If someone interested I can share

 

[warpie]

How often do we encounter gear with unbalanced inputs? Even the cheapest home recording equipment nowadays has balanced inputs. As far as I know pro audio equipment has always had balanced inputs. Only gear with unbalanced inputs I have used have been tape recorders for home/semi pro use.

There's still plenty of gear and consoles that use unbalanced send/inserts.

 

[richiyobs]

approach n4
this one looks cool!
if shorted to get unbalanced, the loss is only 3dB, and the output waveform is 3dB more respect to the input.... also the harmonic content looks quieter respect to running it balanced! no distortion as i can see
best
richi

 

[richiyobs]

comparison, normal and shorted

 

[richiyobs]

should be a good compromise?

 

[richiyobs]

at the end i ll use the blend amp to run unbalanced connection, and split the signal to the new version with 3 opa for balanced one...
since i m going for 2 x ne5532, thinking to use half of the first opa as non inverting follower
cheers

 

[richiyobs]

This is the idea...

 

[richiyobs]

is it possible to have a combo input too, or i could get noise problems?
have to add a switch to isolate the 2 parts?
as always , thanks for your attention
cheers

 

[Sonic]

There's still plenty of gear and consoles that use unbalanced send/inserts.

Yes, the Yamaha GC2020 compressor, for example.

 

[abbey road d enfer]

For a much simpler implementation, you may want to look at ground-sensing impedance-balanced output.
Check Balanced output w/ MC33079
post #14
The only drawback is you can't claim +26dBu output.

 

[richiyobs]

For a much simpler implementation, you may want to look at ground-sensing impedance-balanced output.
Check Balanced output w/ MC33079
post #14
The only drawback is you can't claim +26dBu output.

great! thank you
i will use it to keep the unbalenced input level constant as the balanced one... so don t need that much out
i ll try
cheers

 

[richiyobs]

does anyone know this Vu meter?
https://www.amazon.it/Heayzoki-Misu...44667668&sprefix=so65+vu+meter,aps,165&sr=8-9