Need HPF for OCL-2

[zenmastering]

Attention Pendulum OCL-2 users

3rd post down...

A good 'first electronics project' if there ever was one.

Graemme

[elpillo]

Thank you!!!

Anybody with a better idea rather than me doing something I don't feel very comfortable about? :D

[Ben F]

All you need is a stereo jack and wire the cap between tip and ring, you can't go wrong dead simple.

[zenmastering]

If you can solder/repair a cable, this is even easier..try it; you can't wreck anything, as the worst that will happen is that you'll have no signal passing through the sidechain until you remove the 1/4" plug.

Originally Posted by Ben F

All you need is a stereo jack and wire the cap between tip and ring, you can't go wrong dead simple.

[elpillo]

Ha! Yes, I've solder hundreds of cables in my life. Ok, I guess is not as complicated as I thought. I'll give that a try (I have to somehow amuse myself during the storm, right?)

Thanks!

[Odeon-Mastering]

Here's mine...




...best of luck with the storm

Apostolos Siopis

[elpillo]

Thanks, Odeon Mastering!! It does looks simple, even I can do that... :D

Just to be on the safe side... 2 of these, right??

https://www.sparkfun.com/products/8375



Thanks again, guys!

[Odeon-Mastering]

Originally Posted by elpillo

Thanks, Odeon Mastering!! It does looks simple, even I can do that... :D

Just to be on the safe side... 2 of these, right??

https://www.sparkfun.com/products/8375



Thanks again, guys!

Yeah it will do. And since you are at it, I would suggest trying a few more values ...
I am actually using a filter around 75Hz most of the time .

[elpillo]

Thanks, Odeon Mastering!! I'll do so.

[Colin Leonard]

Yeah, if you can solder a cable you're good! It's definitely worth having a HPF around for the OCL2 and other pieces of gear. I just rigged up a little multi-selector which is nice for choices.

[bonne]

I really liked Brad Bradwood's selector approach shown in the linked thread. Where can I find the cap values for the HPF frequencies, is there a table somewhere?

Thanks

JB

[Alécio Costa]

There is a thread here that shows exactly the combination of the RC newtwork.
Greg Gualtieri created a pdf, it shall be at his website.

[bonne]

Alécio.

I didn't find the PDF at Pendulum Audio - Class A Vacuum Tube Signal Processors. Can you point me to it?

Thanks!

JB

[Alécio Costa]

Sidechain Insert plug Instructions

Stereo 1/4" plug TRS with capacitor between tip and ring connection
The input impedance of the sidechain ring input is 10Kohms.

The equation for
the rolloff frequency F is defined for R in ohms, C in Farads:
F = 1/[6.28 x R x C]

Typical caps are in microfarads, or 1x 10 -6 Farads.

So, if you connect a 0.1 microfarad (uF) cap across the tip and ring of a stereo plug, you get a 6dB per octave rolloff at 159Hz. For a 0.05uF (two 0.1uF caps in series), you get 318Hz.

And so on. No resistors needed. The smaller the cap, the higher the rolloff frequency.

The audio quality of the cap doesn't matter, since it's in the sidechain.

[Alécio Costa]

Cut off Frequency = 1 / 2 x Pi x R x C Where Pi = 3.14......

Hope it helps you!

Nice Weekend

[WBM]

The Gold Point switcher works great.