Re: 7.5Hz cutoff? - slippery

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Re: 7.5Hz cutoff?

Posted by slippery (A) on July 9, 2006 at 11:07:33

In Reply to: Re: 7.5Hz cutoff? posted by PÃ¤r on July 5, 2006 at 04:11:44:

hi, i have been reading a few of these questions and answers, i may have a solution for you.
bulid yourself an excel page using the formula needed, you will need loss of amplification due to cathode bypass, CR coupling and so on. once you have the lot done; apply ohms law mathematically by feeding a number into the start of the circuit.
plotting voltage against frequencies.
my efforts on a two stage amplifer cover all the needed things like power supply against frequency and so on.
you will then see that you have a sum of the different rolloffs. the next important thing is to consider the lowest frequency your speakers can work with (the frequency range say they are 32Hz to 27KHz then your input needs to be 32Hz -3db) then calculate an input rolloff so the sum of the rolloffs equal the same -3db point that you speakers can go down to. i suggest that you use a simple CR plotted on the graph so you have a reference. the closer to the speaker the lower the cutoff, making sure that the main coupling is not deeper than the main resivoir C . this is all very complicated i know, this technique is hard the effort you put does take time. the result on a no feedback se amp is perfection. when building ensure the lowest ESR supply caps and bypass them all.

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Follow Ups Full Thread

Topic - 7.5Hz cutoff? - fred76 03:37:33 07/04/06 (15)

If I understand and recall correctly, the traditional high-end view of filter points (FPs) is that one wants... - jeffreybehr 14:09:05 07/04/06 (1)

Re: If I understand and recall correctly, the traditional high-end view of filter points (FPs) is that one wants... - danlaudionut 19:57:44 07/04/06 (0)

Re: 7.5Hz cutoff? - BBeck 05:11:49 07/04/06 (12)

Re: 7.5Hz cutoff? - fred76 05:57:58 07/04/06 (11)

Re: 7.5Hz cutoff? - PÃ¤r 06:30:08 07/04/06 (10)

Re: 7.5Hz cutoff? - fred76 08:41:24 07/04/06 (0)

Re: 7.5Hz cutoff? - BBeck 08:02:23 07/04/06 (8)

Re: 7.5Hz cutoff? - PÃ¤r 04:11:44 07/05/06 (3)

Re: 7.5Hz cutoff? - slippery 11:07:33 07/09/06 (1)

Re: 7.5Hz cutoff? - PÃ¤r 00:31:50 07/10/06 (0)

Re: Thanks for the reply & link (nt) - fred76 01:00:13 07/06/06 (0)

LF phase errors - Alex M 01:36:22 07/05/06 (0)

Re: 7.5Hz cutoff? - PÃ¤r 23:14:47 07/04/06 (2)

Re: 7.5Hz cutoff? - fred76 02:53:40 07/05/06 (1)

Re: 7.5Hz cutoff? - PÃ¤r 04:14:02 07/05/06 (0)

Follow Ups

Re: 7.5Hz cutoff? - slippery 11:07:33 07/09/06 (1)

Re: 7.5Hz cutoff? - PÃ¤r 00:31:50 07/10/06 (0)

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