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Old 7th August 2006, 11:59 PM   #1
Fuling is offline Fuling  Sweden
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Default Brother-in-law of Zen

I had two audiophile friends over this weekend, and after a nice dinner and a couple of brews we decided to take a dive into the junkbox and build something just for fun. To keep things as simple as possible we went for an resistor loaded single gain stage Mosfet amp. One mosfet, two resistors, two caps and a voltage divider for the bias, it wonīt get much simpler than that.

The first attempt failed miserably due to the fact that I donīt have a line stage, my passive volume control interacted with the Mosfetīs input capacitance and cut off everything above a few kHz.

Some kind of input buffer would be the solution, and after some discussions and a few more beers we decided to copy the ZV4 buffer, using IRF9610īs since that was what I had at home.
By using this buffer and a trimpot for some level shifting we also got rid of the input capacitor, very clever if I may say so myself.
After fiddling with this primitive amp all night we listened to a couple of records early in the morning, and the sound quality was quite amazing. This amp matched my FE167E-based speakers perfectly!

Inspired by this great success I decided to build a bigger and better version. I began working on it yesterday afternoon, and now Iīm almost finished.
As you can see the channels are hardwired to the heatsinks (which I got from a dump).
The capacitance multiplier PSU is salvaged from an old project.
Idling at about 80W per channel, this amp should be good for almost 3W out!!!



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Old 8th August 2006, 12:01 AM   #2
Fuling is offline Fuling  Sweden
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And here:
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Old 8th August 2006, 12:02 AM   #3
Fuling is offline Fuling  Sweden
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And the guts:
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Old 8th August 2006, 12:05 AM   #4
Fuling is offline Fuling  Sweden
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Jeeez, I got censored!!

The title of this thread should read: Bastard son of Zen!
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Old 8th August 2006, 12:14 AM   #5
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by Fuling
Jeeez, I got censored!!

!

hehe
wellcome to the club

btw-where's that dump?
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Old 8th August 2006, 12:53 AM   #6
Fuling is offline Fuling  Sweden
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Hehe, donīt bother looking for that dump, we took all seven of those heatsinks that we found.
A friend took four and I got three, each one is capable of dissipating at least 100W of heat. Probably even more, but I like to run my stuff reasonably cool.
The hottest part in this amp is the heatsink for the cap multiplier...

Wow, I got censored again.
Letīs rename this thing to "Brother-in-law of Zen" instead of Bastard son of Zen

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Old 8th August 2006, 04:00 AM   #7
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Very nice.
A.k.a. illegitimate son of Zen

Josh
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Old 8th August 2006, 07:38 AM   #8
Netlist is offline Netlist  Belgium
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Nice.
I've changed your title.

/Hugo
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Old 8th August 2006, 08:11 AM   #9
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Quote:
Originally posted by Netlist
Nice.
I've changed your title.

Why not "Boy friend of Zen" . . . ?
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Old 8th August 2006, 10:46 AM   #10
Fuling is offline Fuling  Sweden
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Quote:
I've changed your title
Good, thanks!

Quote:
"Boy friend of Zen
Um, gotta think about that for a while
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