Dual compressor in 1RU (other than SSL)?

[OneRoomStudio]

What projects are out there that can fit two channels of compression into one rack unit? I already have a GSSL, so I was hoping for a diode bridge, PWM, FET, or something else. It seems like larger meters are typically the reason for larger enclosure, but controls and transformers can make 1ru for a pair of channels tricky as well.

 

[chrispbass]

What projects are out there that can fit two channels of compression into one rack unit? I already have a GSSL, so I was hoping for a diode bridge, PWM, FET, or something else. It seems like larger meters are typically the reason for larger enclosure, but controls and transformers can make 1ru for a pair of channels tricky as well.

You could squeeze 2 channels of LA4 into a 1U with small vu meters.

 

[OneRoomStudio]

True! Joe Malone’s “MAC” compressor is a great LA-3a(ish) compressor in 1RU. I already have a pair of his LA500a’s though (same circuit in 500 series).

I wish there was a dual JFET or Diode Bridge project in 1RU.

 

[Whoops]

with a long 1U case you can fit 2x G1176 there, it was made before

 

[scott2000]

with a long 1U case you can fit 2x G1176 there, it was made before

This too if you can find any boards.... they're pretty small and there's an fpd for the 1u
https://groupdiy.com/threads/pcbs-for-1176-flavoured-fet-compressor-w-opamps-almost-no-wiring.68997/Been mulling over getting mine finished..

 

[Script]

What projects are out there that can fit two channels of compression into one rack unit?

Heikki's diode bridge comp would fit, if anything front panel control is wired.

 

[scott2000]

Heikki's diode bridge comp would fit, if anything front panel control is wired.

Thinking about it, with the pot sidechain, it wouldn't be bad at all....

 

[scott2000]

Script,

Didn't realize the new diode boards don't use the separate sidechain boards? Just pots are wired off board?
Have you finished and tested yours?

 

[Script]

Hadn't checked ghr website lately, so not sure what boards are available.
(Aso, second half of '23, I was hardly at home.)

Was referring to diode8 board. I used multistrand cable for the rotaries there, cos I prefer thr-rat-att-rel order. SC is on sub board, but heightwise it would all fit into a 1U case if controls are wired.

The diode32 has everything onboard. Att, Rel etc marked as blank resistors. So could go pots, indented pots, or resistors on rotaries.

 

[scott2000]

yeah for sure on the original.. Was thinking those dact type stepped deals could be cool and only have to have one set of controls since they're dual gang usually

Heikki hasn't released the 32 version yet afaik...think he was waiting to get some feedback for possible hiccups before he does but not sure....

 

[Script]

Where you get the dact? Or DIY solution anywhere?

 

[scott2000]

Where you get the dact? Or DIY solution anywhere?

was talking about all these...
Some sellers have linear ones...at least one did when I ordered some several months ago.... they're quite good actually...

https://www.ebay.com/b/dact-attenuator/bn_7024866878
edit..
this seller
https://www.ebay.com/sch/i.html?ite...d=p4429486.m3561.l170197&_ssn=lasercollection

 

[Script]

Would be cool if there was a DIY solution to easily create DACT pots of any kind. But we are hijacking this thread...

 

[drtechno]

What projects are out there that can fit two channels of compression into one rack unit? I already have a GSSL, so I was hoping for a diode bridge, PWM, FET, or something else. It seems like larger meters are typically the reason for larger enclosure, but controls and transformers can make 1ru for a pair of channels tricky as well.

Use your imagination and make one? Or how about taking someone's circuit from a datasheet or circuit ideas flyers. There is a lot of options out there if you want to take it that far.

 

[drtechno]

Would be cool if there was a DIY solution to easily create DACT pots of any kind. But we are hijacking this thread...

There is. But I think it would be too technical to discuss with this audience.

 

[OneRoomStudio]

Use your imagination and make one? Or how about taking someone's circuit from a datasheet or circuit ideas flyers. There is a lot of options out there if you want to take it that far.

That's pretty dismissive. I was just asking a question. A quick look at my profile would show that I have been a member here for almost 20 years and have built many many projects, including designing some of my own. Sometimes a person just wants to know what is available for a quick turn-around project.

There is. But I think it would be too technical to discuss with this audience.

I'm not sure who you mean by "this audience," but designing a surface mount stepped attenuator isn't the most technical thing ever (other than custom mechanical design).

 

[Script]

The PRR176 was (meant as) a 1U stereo 'varimu', but I read somewhere on this forum that tubes might die prematurely for lack of ventilation / heat dissipation inside a 1U case.

Boards show up from time to time.

 

[scott2000]

I have a couple of the original pico boards.... I think they're unbalanced...
pretty sure I also have a couple of the that compressor boards that another member had going for a while....

 

[drtechno]

That's pretty dismissive. I was just asking a question. A quick look at my profile would show that I have been a member here for almost 20 years and have built many many projects, including designing some of my own. Sometimes a person just wants to know what is available for a quick turn-around project.


I'm not sure who you mean by "this audience," but designing a surface mount stepped attenuator isn't the most technical thing ever (other than custom mechanical design).

Well, when you run out of the build by numbers, look to doing something different.
How about a INA217 mic preamp, that is DC coupled 200 ohm input with a balanced line driver IC with gain control at the INA217 and a H-Pad volume control at the end with an output impedance of 10K.

I was joking with the DACT because I don't see people discussing any circuit formulas and just copying. Of course, that guy who is dissecting transformers is interesting another way. Besides that the T type attenuator is not really that great of an attenuator. H type is superior

Compressor? How about a stereo 5 band graphic compressor. Like a simple RC EQ with each pole having its own compressor.

 

[OneRoomStudio]

I have a couple of the original pico boards.... I think they're unbalanced...
pretty sure I also have a couple of the that compressor boards that another member had going for a while....

I think I'll hold on and see how Heikki's new 32 version of the diode comp turns out. It looks like a great concept.