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FH9HVX - Budget Conscious 100w Class AB for Lean Times

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nikpolini

nikpolini

Member
Joined 2019
Hi,.
Yes to the pPI/HiFiBerry running Spotify Connect. It's better than Bluetooth as multiple people can connect, and isn't locked to one family members device... I have a super capacitor and voltage sensing to enable safe shutdown on amp power off. Also there is a cam and microswitch on the input selector to only power the Pi when it's input is selected.
Nik
 
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H

HRDSTL

Member
Joined 2022
Friends,
today pcb's for FH9HVX & All Cee's finally arrived, they are still in the post, and I will go and get them this afternoon! Today I'd like to fit a big spool, which will definitely make me sweat.

I want to ask about the trimmer on the BIAS setup, I'm not sure ...before setting this trimmer to center (500R)?
 
H

HRDSTL

Member
Joined 2022
Now I've made the layout the way I want it, and it's going to be to millimeters so I can fit the toroidal transformers (2x 500W) side by side standing up. It will be in a 4U box 300mm long. Tomorrow I will drill the holes for the FH9HVX board and cut the threads. :)
 

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H

HRDSTL

Member
Joined 2022
Friends, a little progress, ...
On Friday I managed to complete FH9HVX as well as All Cee's (Vishay BC, Audio Note, Mundorf & 4x12.000uF CDE) I managed to mount the FH9HVX on the heat sink over the weekend.

Next I played around with the layout in the box, the best solution I came up with was this: toroidal transformers facing each other and the softstart pcb will be placed on an extra subpanel in front of the transformers.
 

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H

HRDSTL

Member
Joined 2022
Friends, I have 1channel ready, I wanted to start setting up the bias, but my power supply is not working. I used faston jumpers (CC) and found a board fault in the negative power supply. The negative power supply did not work for me, ...
 

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xrk971

xrk971

Founder of XSA-Labs
Joined 2012
etsy.com/shop/XRKAudio
Paid Member
HRDSTL said:
Friends, I have 1channel ready, I wanted to start setting up the bias, but my power supply is not working. I used faston jumpers (CC) and found a board fault in the negative power supply. The negative power supply did not work for me, ...
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Hi HRDSTL,
Sorry about that - that’s a known error of an orphaned pad. Please connect with solder bridge. Scrape away solder mask around the orphaned pads and apply solder to bridge.

https://www.diyaudio.com/community/threads/all-cees-psu-for-class-ab-amp.358478/post-6476101
 
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