alexc

Re: All things LA2a related
« Reply #2600 on: January 13, 2019, 01:47:27 AM »
Hang in there ..it does happen ..  re   'roadbloacks'   along the way.

Keep going thru the schemo and your build  ..  make sure things are mostly OK and go from there.

The result is well worth the travel.

Good luck with it ...
I ping therefore I am


andow

Re: All things LA2a related
« Reply #2601 on: June 11, 2020, 05:27:44 PM »
Sorry if this is obvious, but how do you calculate the current through the Zener diode replacing the neon bulb in the meter circuit?  :-[

dbonin

Re: All things LA2a related
« Reply #2602 on: June 12, 2020, 01:49:48 AM »
Sorry if this is obvious, but how do you calculate the current through the Zener diode replacing the neon bulb in the meter circuit?  :-[

https://groupdiy.com/index.php?topic=3278.2440


its all there... I asked the same question awhile back!  :)
Stand off to the side of the unit, out of the line of fire.  Flip the ON switch...  "Watch for flames and sniff for smoke."

andow

Re: All things LA2a related
« Reply #2603 on: June 13, 2020, 05:10:12 AM »
https://groupdiy.com/index.php?topic=3278.2440


its all there... I asked the same question awhile back!  :)

Thanks! I don't know how I missed that.... :-[

andow

Re: All things LA2a related
« Reply #2604 on: October 27, 2020, 05:51:28 AM »
I guess it's just semantics, but in the manual by Universal Audio it says about the side-chain pre-emphasis:

This potentiometer is factory set for a “flat” side-chain response (clockwise). Increasing
the resistance of this potentiometer by turning it counter clockwise will result in
compression which is increasingly more sensitive to the higher frequencies.


Looking at the schematics however, the response for high frequencies stays the same and compression gets less sensitive to lower frequencies.

Am I reading the schematics correct?

dmp

Re: All things LA2a related
« Reply #2605 on: October 27, 2020, 12:35:03 PM »
Yes,  the pot in parallel with the cap make a HPF.
It does make the compression more sensitive to high frequencies, as the low frequencies are filtered out.
To maintain the same amount of compression as the pot is turned up, the peak reduction would have to be turned up.

andow

Re: All things LA2a related
« Reply #2606 on: October 27, 2020, 12:52:27 PM »
Yes,  the pot in parallel with the cap make a HPF.
It does make the compression more sensitive to high frequencies, as the low frequencies are filtered out.
To maintain the same amount of compression as the pot is turned up, the peak reduction would have to be turned up.

Thanks for the confirmation!  :)


 

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