Aurora Compressor from Aion

[spoontex]

Photos. I've removed pots and switch to take better photos.




https://postimg.org/image/6mnwzot2n/

https://postimg.org/image/5yf2gqucv/

The transistors are fliped beacause I changed the 2n5088 for BC549C.

Thanks.

[whoisalhedges]

> the problem here... Q3 and Q4 have no bias on their bases.

Schematic: http://www.geofex.com/FX_images/rosscomp.gif

With no signal, it is correct for Q3 Q4 to have "no bias". There's nothing to give them static bias. Their function is to pull-down the 10uFd at Q5 *when signal is large*. Bring signal up to +/-0.6V peaks, Q3 Q4 start to suck, 10uFd falls down from 10V, Q5 follows and reduces current through 500K+27K to '3080 pin 5 Vabc, '3080 gain drops.

"too bassy" is not likely a bias issue. A short at Q3 Q4 Base will throw the 0.01uFd on the 10K buffer and whack the highs. Many other shorts and wrong-values are possible. 470 Ohms and 470K Ohms look the same in bad light. If you are not finding it, post clear pictures and maybe some dogged bloodhound here will see it.

Too true, and very indicative of the difference between experience and inexperience (and why, when you show up in the thread, the OP should stop listening to me ) - I haven't built a comp yet; in the overdrives and fuzzes I've built, transistors are amplifiers. So they need to amplify. This is different. Experience steps back and analyzes the circuit at arm's length, naivety sees the first thing that looks "different" from what he's used to and says "yep, that's the problem!"

Carry on.

[spoontex]

I check all resistors, and I found a wrong value in R13 I have a 100k and the correct value is 10k. But the problem persist....

[spoontex]

Now I've the GND ok, they don't drop 9v. But Q3 and Q4 haven't voltaje. And the pins of Attack and Sustain drop 9v... What the hell...

[spoontex]

It don't work. The Attack control don't do anything... so I removed the Trebble Switch and Attack pot following the instructions from Aion: https://aionelectronics.com/wp-content/uploads/2014/12/aion-aurora-ross-compressor-documentation.pdf

They sound with a lot of bass and Little fuzzy...

https://vimeo.com/172173453

My ideas are over, I think that I trowh in bin...

Thanks.

[spoontex]

I changed the IC but the problem persist...