HAL PREAMPLIFIERS - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 1st December 2011, 05:16 PM   #1
diyAudio Member
 
Join Date: Oct 2011
Default HAL PREAMPLIFIERS

Hi all,

A preamplifier can provide the extra control that you need over that high powered amplifier and speaker system. Attached is a circuit idea. Feel free to chip in.

kind regards,

Harrison.
Attached Images
File Type: png preamp6.png (20.0 KB, 1186 views)
File Type: png preamp6-graph.png (14.3 KB, 1143 views)
  Reply With Quote
Old 1st December 2011, 06:33 PM   #2
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour
Assuming your graph represents full boost action only of the bass and treble controls, there seems to be only minimal boost available in the audible region and a waste or even troublesome amounts of it in the sub and supersonic regions.

It's now usual to shelve the tone control responses to provide more useful boost/cut in the audible region and prevent speaker or even amplifier damage.
__________________
Ian
  Reply With Quote
Old 1st December 2011, 07:24 PM   #3
diyAudio Member
 
Nico Ras's Avatar
 
Join Date: Nov 2005
Location: East Coast of South Africa
Since you have a tone control, why not expand it to bass/mid/treble and for good measure throw in a loudness control and balance control. Some may also like a stereo width control. Lets go back to the era of the fanatic knob twiddler.
__________________
Kindest regards
Nico
  Reply With Quote
Old 1st December 2011, 07:33 PM   #4
diyAudio Member
 
Join Date: Sep 2011
Quote:
Originally Posted by Nico Ras View Post
Since you have a tone control, why not expand it to bass/mid/treble and for good measure throw in a loudness control and balance control. Some may also like a stereo width control. Lets go back to the era of the fanatic knob twiddler.
And what about classifying tubes as ASPs from now on.. Analogous Sound Processors. In the eyes of a guitarist this would probably hold easily
__________________
Negative Feedback: The Need for Speed
  Reply With Quote
Old 2nd December 2011, 04:05 AM   #5
diyAudio Member
 
Join Date: Oct 2011
Thank you all

Balance control is in order
Loudness...not critical the tones will do
Stereo width ....well...

The shape of the curves is an attempt to minimize mid band interaction. Also here we are trying to adjust the fringes of the bass and high frequency drivers, the tone has sub woofer capability . Shelving filters would be away to go to handle this. Found an interesting article here http://www.rane.com/pdf/acceler.pdf

With the shape of the tone controls bass boost, it maybe advisable for your phono preamp to feature a steep rumble filter. The high frequency response could also be shaped with a low pass filter.

In order to avoid fanatic knob twiddling we could go the way of a DSP based preamp with on board computer featuring a mic, auto detect for (sealed box, open baffle, hybrid, ported etc) and auto calibration. On adjusting the volume it automatically compensates the frequency curves and factors in the time of day, ambient noise, mood and music type etc.

The purist will shun op-amp based preamp solutions. Discrete circuitry is the in thing.

If we initially wanted to keep it simple and functional wouldn't this do ? Or what must go or what must be added ?
  Reply With Quote
Old 2nd December 2011, 05:58 AM   #6
diyAudio Member
 
Join Date: Oct 2011
Hi all,

I am thinking, lets knock out the last op-amp. Let the third op-amp that handles sensitivity also handle volume . We could change the function of the fourth op-amp to a rumble filter

kind regards,

Harrison.
  Reply With Quote
Old 2nd December 2011, 04:30 PM   #7
diyAudio Member
 
Join Date: Oct 2011
A quick one

Are low pass, high pass, band pass filters HIFI ? Also depends on definition of HIFI ..

lets pile up
  Reply With Quote
Old 2nd December 2011, 09:53 PM   #8
diyAudio Member
 
Join Date: Oct 2011
Default block diagram

Conceptual flow and functionality
Attached Images
File Type: png blockdiagram.png (31.5 KB, 898 views)
  Reply With Quote
Old 2nd December 2011, 11:49 PM   #9
diyAudio Member
 
Join Date: Oct 2011
Default Audio distribution using intelligent devices

The preamplifier with all its functionality was swallowed up into one chip . Without this level of intelligence, would we be able to have the bag of tricks at the cinema, arena and even at home ?
Attached Images
File Type: png AudioDistribution.png (34.0 KB, 831 views)
  Reply With Quote
Old 3rd December 2011, 12:23 AM   #10
diyAudio Member
 
Join Date: Oct 2011
Default an explorative study

Although the curves are rather gentle...
Attached Images
File Type: png preamp6.1.png (18.2 KB, 800 views)
File Type: png preamp6.1-graph.png (20.1 KB, 249 views)
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
A certain HAL Amplifier OnAudio Solid State 0 23rd November 2011 04:41 PM
Preamplifiers v power amplifiers otto88 Tubes / Valves 15 15th September 2010 05:54 AM
Hafler Preamplifiers - DH101 vs. 915 bcrescen Solid State 6 14th July 2008 10:30 PM
HAL-O Damping Instruments Tazzy Tubes / Valves 7 14th October 2004 03:24 AM
Tube Preamplifiers Peaceseeker Tubes / Valves 16 22nd July 2002 10:12 AM


New To Site? Need Help?

All times are GMT. The time now is 06:35 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2