Go Back   Home > Forums > >

Solid State Talk all about solid state amplification.

diyAB Amp - The "Honey Badger"
diyAB Amp - The "Honey Badger"
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools
Old Yesterday, 01:30 PM   #2301
RCruz is offline RCruz  Switzerland
nhinstruments
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
diyAB Amp - The "Honey Badger"
Hi Kean

Would you please post the LTSpice model of the KSC3503 ?

I am simulating several led referenced CCS and it seems using KSC3503 with my models gives higher impedance than with a KSC1845.... strange
__________________
Ricardo
  Reply With Quote
Old Yesterday, 02:40 PM   #2302
keantoken is online now keantoken  United States
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
That is not a strange result since the KSC3503 has higher Early voltage which makes it a better current source. The 2SC4793 might work even better. Medium power transistors often have very high Early voltage.

Small-signal transistors often have low Early voltage, especially if they are primarily for switching use. The KSC1845 and BC550C are reasonably high but you can find better if you want high Early voltage.
__________________
The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
Need something built, repaired or modded? PM me and ask what I can do!
  Reply With Quote
Old Yesterday, 02:58 PM   #2303
RCruz is offline RCruz  Switzerland
nhinstruments
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
diyAB Amp - The "Honey Badger"
I get really high impedance with one KSC3503 and one led ccs.

Are my sim results near reality ?

PS: How do I calculate/determine hearly voltage for a bjt ?
Attached Images
File Type: jpg ONE BJT CCS 3503.JPG (242.4 KB, 140 views)
Attached Files
File Type: asc ONE BJT CCS OUTPUT IMPEDANCE.asc (1.8 KB, 2 views)
__________________
Ricardo
  Reply With Quote
Old Yesterday, 06:05 PM   #2304
keantoken is online now keantoken  United States
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
If Early voltage and Hfe in the model are correct then your simulation result will be correct.

In the LTspice model, VAF is the early voltage and Bf is the Hfe (although other parameters in the model may reduce the actual Hfe such as Ise, Ikf, etc.)
__________________
The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
Need something built, repaired or modded? PM me and ask what I can do!
  Reply With Quote
Old Today, 12:32 AM   #2305
TonyTecson is offline TonyTecson  Philippines
diyAudio Moderator Emeritus
 
TonyTecson's Avatar
 
Join Date: May 2003
Location: Maybunga, Pasig City
Quote:
Originally Posted by keantoken View Post
I know the goal of a baker clamp in itself, but I don't know what the goal of it is in the circuit on the bench. Is there some observed behavior which has led to a failure or some undesirable behavior?

If not then we don't really know what to do about a problem we haven't identified.
under normal music listening, probably nothing....

but try to short the output of the amp for a couple of seconds with music signal present, see how things change so fast.....

some designs i think has mitigating measures built in, Leach did it with his amps....for that eventuality that no one wants and much less anticipated...

this is the reason we had the honey badger redesigned for on board SOA protection...

there are even plans to convert this design to class H...
Attached Files
File Type: pdf Musang TEF Amp W700-09_sch.pdf (55.3 KB, 26 views)

Last edited by TonyTecson; Today at 12:35 AM.
  Reply With Quote
Old Today, 02:00 AM   #2306
TonyTecson is offline TonyTecson  Philippines
diyAudio Moderator Emeritus
 
TonyTecson's Avatar
 
Join Date: May 2003
Location: Maybunga, Pasig City
fyi, the first honeybadger i built blew up according to the owner, i never got a chance to see it again so now i am thinking, would things have been different had an on board SOA protector been incorporated in the design...? i bet it would have survived...
  Reply With Quote
Old Today, 02:05 AM   #2307
keantoken is online now keantoken  United States
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
I would try a resistor at the emitter of the cascode transistor which sets a maximum current according to the cascode voltage. A 56ohm resistor at the emitter of Q12 here would do it:

diyAB Amp - The "Honey Badger"
__________________
The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
Need something built, repaired or modded? PM me and ask what I can do!
  Reply With Quote
Old Today, 02:16 AM   #2308
TonyTecson is offline TonyTecson  Philippines
diyAudio Moderator Emeritus
 
TonyTecson's Avatar
 
Join Date: May 2003
Location: Maybunga, Pasig City
will that address direct and prolonged output shorts?
  Reply With Quote
Old Today, 02:47 AM   #2309
keantoken is online now keantoken  United States
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
The question was about how to clamp the VAS. The resistor will limit the VAS current. This is only useful if the output stage is SOA limited, which will protect against a short.
__________________
The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
Need something built, repaired or modded? PM me and ask what I can do!
  Reply With Quote
Old Today, 02:39 PM   #2310
Vostro is offline Vostro  South Africa
diyAudio Member
 
Vostro's Avatar
 
Join Date: May 2012
Talking about current sources, what bias current do you guys use through 1) the 1N4148 diodes and 2) LED (green) or whatever u might be using.?

Thanks
  Reply to this post

Reply


diyAB Amp - The "Honey Badger"Hide this!Advertise here!
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
diyAB Amp The "Honey Badger" build thread Variac Solid State 4567 10th February 2021 01:49 AM
Honey, I smoked the Weller 8200 jackinnj Equipment & Tools 5 25th April 2011 07:07 AM
Badger Badger Badger..... Mushroom !! 5th element Everything Else 15 20th September 2003 04:16 PM


New To Site? Need Help?

All times are GMT. The time now is 11:26 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki