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Old 4th March 2002, 12:59 PM   #1
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Default Hot follower/cool follower

Hi

I am wondering if anny of you have build Andrea Cufioli`s Hot and cool follover. In the scematics om his home page some of the parts walues are not there. what should they be? MY_A Both the hot and cool follower are missing some walues. Hope you can help.

MVH Peter

http://www.geocities.com/ResearchTri...my/index.html#
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Old 4th March 2002, 02:59 PM   #2
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Location: Dallas,Texas
Thumbs up Follower

I have built something simular to his Mosfet follower circuit with
Panasonic HFQ caps bypassed by Polypropelyne film caps. It sounded excellent.

H.H.
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Old 4th July 2002, 09:34 AM   #3
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Default andrea`s power follower

Ive constructed the power follower (andrea ciufoly) with a bride of zen as a voltage amplifier; the sound is excellent, but it seems the heatsinking is a big problem; with 20% more heathsinking capability than the sugested, my amplifier is a little more than 25 C over ambient temp with only 1.3 A bias ( 10 W output)
does anybody have the same problem?
thanks in advance
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Old 4th July 2002, 09:40 AM   #4
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Default some pics

the two box follower; one for the amp and other for the regulated psu
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File Type: jpg follower.jpg (49.9 KB, 434 views)
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Old 4th July 2002, 09:45 AM   #5
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Default more pics

the two box
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Old 4th July 2002, 09:48 AM   #6
Freddie is offline Freddie  Sweden
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karellen,
I've also built a Power follower 99. Mine runs at 2amp, 100W dissipation per channel. I use heatsinks rated 0,34K/W. So heatsink temperature is around 34 degrees above ambient . (0,34*100W).

/Freddie
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Old 4th July 2002, 09:51 AM   #7
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the roof off...
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File Type: jpg follower sin tapa.jpg (42.0 KB, 439 views)
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Old 4th July 2002, 09:53 AM   #8
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the two box and the missing pic!
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File Type: jpg follower completo.jpg (39.6 KB, 411 views)
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Old 4th July 2002, 10:08 AM   #9
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Hi, Freddie!
your comments are very welcome!

so the dissipation I have can be considered normal?
my room temp today is about 27 C and will reach 31C ( the summer in Spain)
so your amp will iddle at 61 C...
when mine is over 55 Ive heard clics and other strange noises,
and Ive shutted down...
may I ask you to send a picture of your amp?
what are you using as a driver stage?
many thanks in advance


Quote:
Originally posted by Freddie
karellen,
I've also built a Power follower 99. Mine runs at 2amp, 100W dissipation per channel. I use heatsinks rated 0,34K/W. So heatsink temperature is around 34 degrees above ambient . (0,34*100W).

/Freddie
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A cold amp is a sad amp... I like them warm at least
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Old 4th July 2002, 10:27 AM   #10
Freddie is offline Freddie  Sweden
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Join Date: Oct 2000
Location: Sweden
Quote:
so the dissipation I have can be considered normal?my room temp today is about 27 C and will reach 31C ( the summer in Spain)
so your amp will iddle at 61 C...
when mine is over 55 Ive heard clics and other strange noises,
and Ive shutted down...
may I ask you to send a picture of your amp?
what are you using as a driver stage?
many thanks in advance
I don't have a picture of my amp (no digital camera). As driver stage I'm using a BoZ running at 100V. It really sounds strange that you heared clicks, and strange noises when the follower get hot. Mine is always really quite. I've been using this follower and BoZ for two years. But now I'm going to replace it..
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