Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

diyAB Amp  The "Honey Badger" build thread
diyAB Amp  The "Honey Badger" build thread
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 Search this Thread
Old 7th February 2018, 03:35 PM   #3011
AndrewT is offline AndrewT  Scotland
R.I.P.
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by medi57 View Post
Will it hurt? ...........
Yes, both your pocket and the design.
A higher voltage from the PSU will result in a higher dissipation in all devices passing current from those rails.
That means selecting devices that can tolerate the extra dissipation.
And now that you have these higher dissipations you need bigger heatsinks to get rid of that heat.
__________________
regards Andrew T.
  Reply With Quote
Old 7th February 2018, 04:01 PM   #3012
prasi is offline prasi  India
diyAudio Member
 
prasi's Avatar
 
Join Date: Jan 2014
Location: Near Western Ghats
diyAB Amp  The "Honey Badger" build thread
Quote:
Originally Posted by AndrewT View Post
Yes, both your pocket and the design.
A higher voltage from the PSU will result in a higher dissipation in all devices passing current from those rails.
That means selecting devices that can tolerate the extra dissipation.
And now that you have these higher dissipations you need bigger heatsinks to get rid of that heat.
If its just a matter of device dissipation and Heatsink, he can do the following
1. use use MJL devices
2. use a speed limited fan, xrk uses them often.

This could just save heavy expenses.

But I wonder if its just the devices and heatsinks that need attention.
__________________
My revamped site https://sites.google.com/site/analogdesign1234/
  Reply With Quote
Old 7th February 2018, 04:15 PM   #3013
medi57 is offline medi57
diyAudio Member
 
Join Date: Dec 2017
Quote:
Originally Posted by AndrewT View Post
Yes, both your pocket and the design.
A higher voltage from the PSU will result in a higher dissipation in all devices passing current from those rails.
That means selecting devices that can tolerate the extra dissipation.
And now that you have these higher dissipations you need bigger heatsinks to get rid of that heat.
45 it is!

Thanks
  Reply With Quote
Old 11th February 2018, 08:17 AM   #3014
stuartmp is offline stuartmp  Australia
diyAudio Member
 
Join Date: May 2016
Location: Gold Coast
Hi All. I was just wondering if there is a more detailed description of how this circuit works. I am fine with 90% of it. I just don't see exactly how the output of the differantial pair drives the vas. It looks like the output of the current mirror (top left of the schematic) is attached to two pnp transistors which form a VAS cascode (top center of the schematic) which is then supplying the bias current for the vbe multiplier which drives the output transistors.

If someone can provide me so more details or point me to a older post discussing this that would be awesome.

Cheers

Stuart

Last edited by stuartmp; 11th February 2018 at 08:31 AM.
  Reply With Quote
Old 24th February 2018, 05:42 PM   #3015
rock12 is offline rock12  United States
diyAudio Member
 
Join Date: Nov 2010
Location: midland mi
I am building th hb as designed and need to know fuse sizes at the switch in the 4u case and on the circuit board
  Reply With Quote
Old 24th February 2018, 06:03 PM   #3016
mbrennwa is offline mbrennwa  Switzerland
diyAudio Member
 
mbrennwa's Avatar
 
Join Date: Mar 2005
Location: Zurich, Switzerland
Quote:
Originally Posted by rock12 View Post
I am building th hb as designed and need to know fuse sizes at the switch in the 4u case and on the circuit board
The fuses on the board are 5 x 20 mm.
The size of the fuses in the IEC/switch assembly depend on the IEC/switch you use (but they are often also 5 x 20 mm).
__________________
[ audioroot.net | hifibau.ch ]
  Reply With Quote
Old 24th February 2018, 06:55 PM   #3017
prasi is offline prasi  India
diyAudio Member
 
prasi's Avatar
 
Join Date: Jan 2014
Location: Near Western Ghats
diyAB Amp  The "Honey Badger" build thread
use slow blow 5 amp fuse on mains 5mm x 20mm along with a matching case thats panel mounted and easy to replace from outside.
on the pcb , use 7-8 amps fast blow of 5mm x 20mm size on amp pcb.
__________________
My revamped site https://sites.google.com/site/analogdesign1234/
  Reply With Quote
Old 25th February 2018, 10:58 AM   #3018
rock12 is offline rock12  United States
diyAudio Member
 
Join Date: Nov 2010
Location: midland mi
thanks prasi I guess I stated the question poorly I was after amperage I am wondering how we deduce the needed ampereg the mains fuse supplies the universal power supply with the an 8445 tranny for a power supply of 62 volts to the hb amp prasi recommends 5amp at the mains and 7 amps at the hb board this seems backward to me but sometimes my logic is bad
  Reply With Quote
Old 25th February 2018, 11:25 AM   #3019
jwilhelm is offline jwilhelm  Canada
diyAudio Member
 
Join Date: Jun 2014
Location: New Hamburg, Ontario
The transformer manufacturer normally will recommend a maximum input current for their products. If not you can calculate it by dividing the VA rating of the transformer by your line voltage. Normal industrial practice is to multiply this number by 125% for inrush, but this isn't really required with a good soft start circuit. Add any other current draws in your amplifier (control transformers, ect) and you have your fuse rating.

Rail current will be much higher than mains current. The mains voltage is stepped down increasing current available, plus there is a considerable current reserve available in the supply capacitor bank. If you install too light of a rail fuse you will get distortion resembling clipping at high output, and you will see some discolouration and deformation of the fuse element as it starts to melt on current peaks, then re-solidifies (fuse distortion). I use a separate output stage over-current protection and use 15A rail fuses normally in my builds.
__________________
https://www.vzaudio.com/
  Reply With Quote
Old 6th March 2018, 10:02 PM   #3020
Silvi is offline Silvi  Malta
diyAudio Member
 
Join Date: Mar 2016
If the Honey Badger had to be powered with an smps would it worsen its performance? SMPS can give big power being smaller and lighter. Output capacitance would not have to be so abundant either as these will recover around a 1000 times faster than a normal 50Hz transformer
  Reply With Quote

Reply


diyAB Amp  The "Honey Badger" build threadHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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" Variac Solid State 1931 23rd August 2018 06:18 PM
My LM3886 build thread CanAm Man Chip Amps 22 13th July 2012 07:48 AM
Ricci's dual B&C 21SW152 build thread. Josh Ricci Subwoofers 22 12th April 2010 09:39 PM
New Project Build Thread ryoung Multi-Way 5 19th April 2008 01:15 AM
Badger Badger Badger..... Mushroom !! 5th element Everything Else 15 20th September 2003 03:16 PM


New To Site? Need Help?

All times are GMT. The time now is 06:42 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki