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7th August 2006, 11:59 PM
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#1 |
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diyAudio Member
Join Date: Aug 2001
Location: Sweden (Mora)
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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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8th August 2006, 12:14 AM
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#5 | |
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diyAudio Member
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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Quote:
hehe wellcome to the club  btw-where's that dump? 
__________________
my Papa is smarter than your Nelson ! tnx to  clean  thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb
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8th August 2006, 12:53 AM
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#6 |
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diyAudio Member
Join Date: Aug 2001
Location: Sweden (Mora)
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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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