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Old 13th November 2013, 11:08 PM   #1111
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Quote:
Originally Posted by mattmcl View Post
And true dual mono to boot!
There are many levels in between ,as well .....

Attachments (PSRR):

#1. = Unregulated plain ol' Badger ....

#2. = Badger with a diode bypassed 8200uF / .47R / 8200uF CRC.

#3. = Badger with separate PS for small signal section.

#4. = The combination of the CRC + separate 65V supplies for LTP/VAS
(OPS runs on 58V).

This was with a single output stage supply (not full dual mono). 1V ripple was simulated.

OS
Attached Images
File Type: jpg unregulatedbadger.jpg (44.3 KB, 621 views)
File Type: jpg CRC badger.jpg (40.2 KB, 609 views)
File Type: jpg regulatedbadger.jpg (38.9 KB, 599 views)
File Type: jpg CRC-regulated-badger.jpg (41.8 KB, 587 views)
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Last edited by ostripper; 13th November 2013 at 11:10 PM.
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Old 14th November 2013, 07:29 AM   #1112
AndrewT is online now AndrewT  Scotland
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The CRC is very effective !

And the combination of CRC + separate front end PSU is especially so.

I am slightly surprised that the separation of the Front end supply really only benefits the LF. Is this a quirk of the Honey Badger, or is it something we would see more generally in other amplifiers?
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Old 14th November 2013, 12:36 PM   #1113
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Quote:
Originally Posted by AndrewT View Post
The CRC is very effective !

And the combination of CRC + separate front end PSU is especially so.

I am slightly surprised that the separation of the Front end supply really only benefits the LF. Is this a quirk of the Honey Badger, or is it something we would see more generally in other amplifiers?
Yes ! "single ended" amps like the Badger seem to behave like this.
Push pull VAS's are natively superior by design (below 1 -push-pull VAS PSRR/ NO CRC).

But I thought I would port the advantages of the CRC back to the good 'ol
Badger.
(below 2) is a mod that can be added to the DIYA power supply board.
Add 2 - 10W 1R resistors + 2 10-15A diodes to the DIYA PCB instead of those jumpers
(between the 2 sets of reservoirs -C/R/D/C) .

For the front end supply , just a single 50VA 50-0-50VAC trafo with simple cap multipliers
would be sufficient.

Edit - amps like the leach or the GLA (push pull) already have basic regulation
(raw zener for the leach and zener/emitter follower for the GLA) , this also increases
PSRR.

OS
Attached Images
File Type: jpg push-pull-native.jpg (42.3 KB, 443 views)
File Type: jpg CRC.jpg (57.4 KB, 205 views)
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Last edited by ostripper; 14th November 2013 at 01:02 PM.
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Old 17th November 2013, 12:39 PM   #1114
lamir35 is offline lamir35  Israel
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Is it possible to add a "preamp" to it so the input from the DAC could be attenuated?
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Old 17th November 2013, 11:06 PM   #1115
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Or just a simple 100k potentiometer.

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Old 20th November 2013, 06:17 PM   #1116
lamir35 is offline lamir35  Israel
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Too bad I already bought a preamp... So when will the PCB's be available?
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Old 20th November 2013, 08:51 PM   #1117
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I was told by Christmas , hopefully Variac will PM me if he needs any
help or if there were any errors/"adjustments" .

It seems every build of this amp was either "stunning" or had very
easily resolved device or build mistake errors.

OS
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Old 21st November 2013, 04:48 PM   #1118
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Quote:
Originally Posted by ostripper View Post
Or just a simple 100k potentiometer.

OS
So doesn't the amp actually need a preamp or is it source dependant?
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Old 21st November 2013, 05:13 PM   #1119
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Originally Posted by MASantos View Post
So doesn't the amp actually need a preamp or is it source dependant?
You can use either , I use a PC soundcard.
I've also used a portable MP3 player , any 1-2V p-p source works well.

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Old 21st November 2013, 07:05 PM   #1120
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Cool! So it's quite easy to build it as an integrated amp!
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