Hairball Audio

Re: [BUILD] Hairball Audio "Lola" Mic Pre - On Sale Now
« Reply #440 on: November 02, 2018, 12:28:47 AM »
Hi Mike... I assembled my Lola Mic Pre kit w/ the 990 opamps.  The basic unit works fine except for the last 2 steps on the grayhill... they seem to be highly distorted regardless of output level on the attenuator. This is regardless of Mic or DI input. 

Also the metering does not work at all...   Nothing feels warm in the circuit.  I have a power supply on order since I cannot test anything when its inside of my API Lunchbox thing. 

Help...

Bill

Sure your not clipping the signal or your converters?

Mike
Hairball Audio, LLC
DIY Parts and Kits
http://hairballaudio.com/shop

Top secret stuff and upcoming releases:
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http://twitter.com/HairballAudio/


Re: [BUILD] Hairball Audio "Lola" Mic Pre - On Sale Now
« Reply #441 on: November 25, 2018, 09:42:59 PM »
Hey Mike,

I'm plugging along here assembling my Lola and have noticed that the 4x opamp power supply caps in my kit at bi polar (47uf 25v).  Is this OK or do they need to be polarized? 

Thanks!

-Terry   

Phil

Re: [BUILD] Hairball Audio "Lola" Mic Pre - On Sale Now
« Reply #442 on: December 28, 2018, 09:14:49 AM »
Hey guys,

I'm having problems with one of my 990-DIY - I'm smoking the 36 & 37 resistors and I can't seem to figure out what the problem is.

In the beginning I made the mistake that I had the polarity of the diodes on the TO-220 wrong - I put in new diodes and resistors (36 & 37) now but could i have maybe smoked the transistors and that's why the resistors keep smoking?

I've checked the 990 several times now, comparing it with the second one wich doesn't seem to make any problems but i can't find an error or any shorts on the backside..

Do you have any suggestions on what to check?

Thx
Phil

BWilman

Re: [BUILD] Hairball Audio "Lola" Mic Pre - On Sale Now
« Reply #443 on: January 01, 2019, 10:19:48 PM »
Completed build smoked r36. Purchased and built another op amp and installed with new resitor, r36. No smoke. Finished assembly all seems good, 3 buttons light up nicely.  Get sound when gain is maxed. Heavy distortion and no led's. Any thoughts?
Thank you.

ECS

Re: [BUILD] Hairball Audio "Lola" Mic Pre - On Sale Now
« Reply #444 on: March 19, 2019, 05:24:23 PM »
About to build my first Lola (my 3rd hairball kit) and I had a quick question I wonder if anyone else has dealt with.

I'm interested in using green diffused LEDs in place of the white LEDs in the meter, and also yellow and red diffused LEDs in the switches rather than the blue.  I know the blue and white LEDs are superbright so I was wondering if anyone else had done this and what current limiting resistors they had settled on for uniform brightness?

Hairball Audio

Re: [BUILD] Hairball Audio "Lola" Mic Pre - On Sale Now
« Reply #445 on: March 19, 2019, 06:14:00 PM »
Completed build smoked r36. Purchased and built another op amp and installed with new resitor, r36. No smoke. Finished assembly all seems good, 3 buttons light up nicely.  Get sound when gain is maxed. Heavy distortion and no led's. Any thoughts?
Thank you.

Could the other op-amp be bad?

Did you build them yourself?
Hairball Audio, LLC
DIY Parts and Kits
http://hairballaudio.com/shop

Top secret stuff and upcoming releases:
http://facebook.com/hairballaudio
http://twitter.com/HairballAudio/

Hummingwire

Re: [BUILD] Hairball Audio "Lola" Mic Pre - On Sale Now
« Reply #446 on: Today at 05:28:06 AM »
Hi Mike, is there a way to buy one of these beauties from the EU? I know this isn't in your hands, but the customs and the delivery time are a complete buzzkill.  :-\


 

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