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Old 28th August 2013, 07:16 PM   #501
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What's your time worth setting it up? Why not just buy the boards from the store? There aren't many left in this batch, better hurry!

The diyAB "Honey Badger" Class AB Power Amp - 150W/Channel (2 Channels) - Power Amplifiers - Circuit Boards
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Old 28th August 2013, 07:59 PM   #502
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Hi
Uk store has shut down I believe, and my bro does it where he works so my setup time is nil I guess. He didn't seem to think it was a big issue, we used to do it old money, u know, permanent marker, chemicals, bad etching etc.
Anyway, be a lot cheaper this way...
Thx
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Old 28th August 2013, 10:37 PM   #503
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Ahh, didn't see your location. Perhaps OS will share with you. Send him a PM.
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Old 28th August 2013, 10:44 PM   #504
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Hi Guys,

I'm populating my boards and have come to a road block. I read this in the build docs.

"The cascode (Q3-4) can be setup in 2 (or more) ways.

- The first is a zener referenced design - omit R18 , replace
with a 1/2w- 1w 12-15V zener diode and set jumper pad "C" to "Z" with thin wire. The "CRZ" jumper pads
are located above D1-2 near "OFFSET". You will have a cascode reference of either 12 or 15V , depending
on Zener diode choice.

- The second way is to use the "luxman" way ,a crude resistive design. R18 is left as is (NO D3) , jumper "C"
will bridge to "R". This will set the cascode reference to roughly 1/3 of the supply voltage ... whatever that is."


Man I hate choices. That's why I eat at buffets, I don't have to tell a waitress what I want.

I used MPSA06 for Q1/2 because I had a bunch of them and I had already matched them. Anyway my question is should I go with the zener or resistor?

Thanks, Terry
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Old 28th August 2013, 11:23 PM   #505
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Thx, I've pm os,
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Old 29th August 2013, 03:52 AM   #506
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Terry, The zener referenced version is somewhat similar to the way your Leach amp is set up, although in the Leach the zener references to ground and here it references to the tail of the LTP. Some say the tail is the proper place to reference a cascode. However, none other than Nelson Pass has used the "crude" way. Look at the F5T V3

Either try something completely different and go crude, or see if you can tell the subtle difference between a ground referenced cascode and a LTP referenced cascode. Either way you can't go wrong. Sounds like OS likes the LTP referenced zener version.

To throw another option in the mix, you can make a header at the CRZ jumpers and go back and forth - do you like your cascode referenced to ground or the LTP? Do the same and put either the zener or resistor in the circuit. Four variations to listen to.
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Old 29th August 2013, 04:00 AM   #507
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Ha. ha. There you go again Bob, leading me into the deep end.

Nelson has been at it longer than OS. I go crude.

Blessings
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Old 29th August 2013, 10:02 AM   #508
AndrewT is online now AndrewT  Scotland
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Do you want me to make the choice for you?

Then I would go with the Zener referenced Cascode.
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Old 29th August 2013, 10:19 AM   #509
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Quote:
Originally Posted by AndrewT View Post
Do you want me to make the choice for you?

Then I would go with the Zener referenced Cascode.
Please explain why.

Thanks
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Old 29th August 2013, 10:23 AM   #510
AndrewT is online now AndrewT  Scotland
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Because it works at holding the Vce of the input pair more steady and holds the capacitance seen at the input lower, than no cascode.

The Honey Badger was deliberately designed to allow choices.
You will have quite a few more to make before you complete.

You can make informed choices, but to do that you have a lot of background reading/learning to do. Or you make "guess" choices and accept the outcome.

There is another method. You build all the versions and compare the outcomes to become informed and then you make an informed choice of which you want to build copies of for your long term enjoyment.

You choose.
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Last edited by AndrewT; 29th August 2013 at 10:32 AM.
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