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| simon Member Joined: Mar. 20, 2009 |  Message [#1] posted on: 03-20-2009 11:51 PM CST (US).   |  |  Is anyone can tell me how to build simple RC high pass filter, roll off freq 100hz, 6db. Thank you for your kindness.. |
cmoy  Administrator Joined: Apr. 13, 1999 | Message [#2] posted on: 03-21-2009 12:29 AM CST (US). | | See here. |
amb Headphone Council Joined: Apr. 1, 2004 | Message [#3] posted on: 03-21-2009 02:08 AM CST (US). | | Don't forget the "R" in the diagram includes any load connected to the filter. Suppose you're connecting a 32 ohm headphone to it, then you must factor 32 ohms into the actual R value. Similarly, if this filter feeds the input of an amplifier whose input impedance is 10K ohms, then that must be taken into account. |
| SIMON Member Joined: Mar. 20, 2009 | Message [#4] posted on: 03-21-2009 10:31 AM CST (US). | | Thanks for replay, can you tell me what cap value to get 100hz roll off, I'm really dumb with that formula. This filter will feeds into 12AL5 tube diode in my sidechain compressor. Audio signal is from plate output tube 7044(Push Pull) [Edited by SIMON on 03-21-2009 at 03:27 PM.] |
| SIMON Member Joined: Mar. 20, 2009 | Message [#5] posted on: 03-21-2009 12:51 PM CST (US). | | Just found this http://sim.okawa.../CRhikeisan.htm , 100n cap and 16k R is what i need? |
| cmoy Administrator Joined: Apr. 13, 1999 | Message [#6] posted on: 03-21-2009 01:43 PM CST (US). | | Wish I could help but I don't know tubes. |
| SIMON Member Joined: Mar. 20, 2009 | Message [#7] posted on: 03-21-2009 03:17 PM CST (US). | | Never mind cmoy....thanks for your kindness.. |
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