Presenting the documentation for the F5m appearing shortly in the store.
The Essentials kit consists of the Jfets and Mosfets plus two channels of pc board and 1 power supply pc board.
The Completion kit is everything else except chassis, power transformer, rear panel connectors/switch/ac inlet.
The kit is designed around several chassis available in the store, but is fairly agnostic.
Attached is the article I wrote for this project, and this is the support thread.
2/11/2024 After testing by member 6L6, I revised the power supply layout and made an additional
note about the power supply thermistors with higher output stage biasing. The revised article is labeled
R1, and both are attached below.
Update Alert: It turns out that the insulators we bought were not very insular. Not a disaster in general
but a problem if your heat sinks are bare metal. Different pads are available for this.
See the details in post 1,003 of this thread.
Also note 4/21/2024 revision of the power supply board.
EDIT: Build Guide here - https://guides.diyaudio.com/Guide/F5M+Amplifier/29?lang=en
The Essentials kit consists of the Jfets and Mosfets plus two channels of pc board and 1 power supply pc board.
The Completion kit is everything else except chassis, power transformer, rear panel connectors/switch/ac inlet.
The kit is designed around several chassis available in the store, but is fairly agnostic.
Attached is the article I wrote for this project, and this is the support thread.
2/11/2024 After testing by member 6L6, I revised the power supply layout and made an additional
note about the power supply thermistors with higher output stage biasing. The revised article is labeled
R1, and both are attached below.
Update Alert: It turns out that the insulators we bought were not very insular. Not a disaster in general
but a problem if your heat sinks are bare metal. Different pads are available for this.
See the details in post 1,003 of this thread.
Also note 4/21/2024 revision of the power supply board.
EDIT: Build Guide here - https://guides.diyaudio.com/Guide/F5M+Amplifier/29?lang=en
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Almost an hour and I can't believe I'm the first to respond! This looks like a great kit for a schlub like me... Might give it a try after I finish my latest ACA. Thanks again, Nelson!
Essentials arrived, being processed by store, completion ready to ship to store very shortly.
I expect store listing this week...
I expect store listing this week...
I see you are also going for small and compact PCB now, not your usual long and thin ones.
🤓
Patrick
You don't have to show it to her.... until the rack if full... hmm.. where did THAT come from?
Hint, keep the payments on stuff in bunches... 500 bucks or so.. whatever works in keeping it under the radar. And then make sure the amps are all in the same style of boxes.... rotate them in and out of the closet, make sure they're not all together in the same place at the same time.
Never let her count up to 30... then you'll be toast. I got caught with six in the rack(s)... oops...
if worse comes to worse, put a big ribbon on it and a bouquet of roses ( Costco has great prices) and wish her "Happy Valentine's"...
Do they have Costco in the Philippines?
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In the BOM there is mentioned for Q3 the IRFP9240. Is this a typo?
The circuit shows the IRFP9140.
The circuit shows the IRFP9140.
how is it possible that F5m don't need NTCs for stable bias? F5 without NTCs is drifting..
same grade of the jfets as the F5?
same grade of the jfets as the F5?
will it make sense (a sonic improvement) to bypass the source resistors of the output fets with say 1F or 3,3 F supercaps?