Re: Audio peak limiter for home-brew headphone amp
« Reply #20 on: March 21, 2020, 07:10:49 AM »
Fastest options, diode clipping, very efficient to limit peaks, RMS another story. Another option is to limit the rails of the amp and add a resistor at the output so certain max power could be delivered from the amp to the HP.

If you want a real limiter you may go for a FET or any other simple topology, Fet being the option 1, diode bridge and transconductance after I guess.

For FET:
1 Fet per channel, some caps and resistors for polarization and an opamp with a couple of diodes for control voltage.


For diode bridge:
4 diodes per channel, one resistor, same for CV.


A passive diode, nasty but working (tried out by myself, it could add attack release, ratio and even do asymmetrical compression)


For transconductance:
3 transistors per channel, some resistors, same CV.


A CA3080 or LM13700 also use this topology but already solved in an IC.

Times could be fixed for fast attack and release for taste.

/*images are for reference of the topology, not the final design that you should use, just to explain my self better, as amp you probably could use the one you already have 2nd and 4th scheme doesn't have the CV generator (rectifier and time constants)*/

JS
Hi js.
How to add attack and release for the passive diode design ?
Thanks


JohnRoberts

Re: Audio peak limiter for home-brew headphone amp
« Reply #21 on: March 21, 2020, 10:14:19 AM »
Hi js.
How to add attack and release for the passive diode design ?
Thanks
diode clippers do not have attack/release....

JR
Don't only half-ass tune your drums. Visit https://circularscience.com to hear what properly "cleared" drums sound like.

Re: Audio peak limiter for home-brew headphone amp
« Reply #22 on: March 21, 2020, 12:29:52 PM »
diode clippers do not have attack/release....

JR
Ok
Thanks 😊

Audio1Man

Re: Audio peak limiter for home-brew headphone amp
« Reply #23 on: March 21, 2020, 07:04:02 PM »
Here is a basic simple limiter that can be added to almost any amplifier circuit. The 20k pot make it simple to set the amount of clipping and then final resistors can be used for completed circuits.

Duke

Re: Audio peak limiter for home-brew headphone amp
« Reply #24 on: March 22, 2020, 06:19:25 AM »
Here is a basic simple limiter that can be added to almost any amplifier circuit. The 20k pot make it simple to set the amount of clipping and then final resistors can be used for completed circuits.

Duke
Do you think that the fully passive diode limiter will be non usable ?

gyraf

Re: Audio peak limiter for home-brew headphone amp
« Reply #25 on: March 24, 2020, 01:14:25 PM »
it's a clipper - not a limiter - that one..

/Jakob E.
..note to self: don't let Harman run your company..

Audio1Man

Re: Audio peak limiter for home-brew headphone amp
« Reply #26 on: March 24, 2020, 04:42:51 PM »
I thought that “diydidi” asked for “Audio peak limiter for home-brew headphone amp” or did he ask just a limiter?
Duke

Re: Audio peak limiter for home-brew headphone amp
« Reply #27 on: March 24, 2020, 07:07:49 PM »
Ok,
I understand now 👍
Thanks