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Old 12th April 2014, 09:48 AM   #2431
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Is that the "Forward Transfer Admittance" in the datasheet?

LTP?

What is the ztx for? Oh I guess to get a CC for the single fets

Last edited by dieringe; 12th April 2014 at 09:50 AM.
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Old 12th April 2014, 10:08 AM   #2432
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Old 12th April 2014, 11:43 AM   #2433
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Quote:
Originally Posted by dieringe View Post
Is that the "Forward Transfer Admittance" in the datasheet?

LTP?

What is the ztx for? Oh I guess to get a CC for the single fets
yup - Yfs

LTP , as input pair , arranged in

regarding ZTX ..... I really don't know which exact schmtc you're referring to
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Old 12th April 2014, 11:48 AM   #2434
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Originally Posted by Zen Mod View Post
regarding ZTX ..... I really don't know which exact schmtc you're referring to
Eric's replacement:
http://www.facstaff.bucknell.edu/esa...JFET-input.jpg
also seen here a few pages before
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Old 12th April 2014, 12:16 PM   #2435
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for that - any universal PNP

BC556 , BC557 , BC560 , BC327

they're cascodes for Jfets

and , you don't need two of them in parallel - just one per leg , especially if using BC327 , tough bugger
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Old 12th April 2014, 12:31 PM   #2436
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Replacement is clear
So you have to cascode a jfet as opposed to the irf, it's not just because it's multiple jfets in parallel
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Old 12th April 2014, 12:40 PM   #2437
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you don't need to cascode them with your 15V per rail

generally - cascoding is usually (for cascoded par) either as voltage umbrella or dissipation blanket ...... or both
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Old 4th May 2014, 05:55 PM   #2438
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Default Finalising my Aleph-X, spkr protection and servo's

I'm just finalising my Aleph-X prototype before building my final form mono-blocks with wife acceptance factor included.

I have a few problems that seem to already have been discussed;

I need to drive my amplifiers from a single ended source and tried to use a single to balanced converter (based on DRV134) - all worked well until one day the DRV134 gave up and put one output at v+ rail level. Not a problem because I only had a load resistor connected across the speaker outputs but I would have cried my eyes out if I had popped a driver in my speakers - A speaker protection circuit would seem the obvious answer but I have some concerns about it tripping because it will be comparing DC from the speaker outputs to ground but the amplifier outputs are referenced to each other rather than to ground. The DC offset is also very temperature dependant (which brings me back to the servo circuit). Has anyone implemented speaker protection on an Aleph-x?

Is there a preferred method (i.e. KTY81/110 temperature sensor(s) vs a servo?)
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Old 4th May 2014, 07:01 PM   #2439
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you have somewhere on forum schmtc made by EUVL - spk protection for balanced amps

look for "XEN Balanced Speaker Protection Public 131003"
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Old 4th May 2014, 07:05 PM   #2440
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http://xen-audio.com/documents/f5x/X...c%20131003.pdf

There is an updated, improved version (JFET input) with a PCB layout.
But I have no time in the next 6 months to verify and publish.
So you should try this one first.


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