FSSA amplifier build thread with review

[Vunce]

Looks like his own creation.

 

[nfsgame]

Vunce is right... Have fun with it.

Terminals are 8191 (dual secondary inputs are WAGO 236-102), heatsinks 104-style or similar.

Use a good quality solder station. Maybe you want to preheat the big copper areas using hot-air.

Be careful, heatsinks of the dual secondary version are grounded - always use insulators!

 

[Vunce]

Thanks for sharing these psu layouts nfsgame.
Could you also attach the schematics?

 

[nfsgame]

It's not that difficult. CC-R-CCCCc with bleeder and LEDs with resistor at the last node. But I'll upload it this afternoon.

 

[zman01]

nfsgame, thanks for sharing the design.

 

[nfsgame]

Thanks for sharing these psu layouts nfsgame.
Could you also attach the schematics?

 

[Vunce]

Thank you sir!
You’re correct, not an overly complicated circuit, but I like to have supporting documents with all my projects for reference. 😉

 

[fab]

Nice work Nfsgame
just for clarification, the schematics shows 0R47 but the R should not be higher than 0.1 ohms as shown in your picture of post 459 for the FSSA in class AB.
Fab

 

[nfsgame]

That was a placeholder as I planned with multiple smaller wattage resistors in a previous version. Thanks for clarification. I've built mine with 0R1, too.

 

[nfsgame]

Just some test-fitting...

 

[zman01]

Looking good nfsgame.

What make are those EI-core transformers?

 

[nfsgame]

Both are pulled out of old ProLogic receivers. Directly out of the production era of the bad caps prime time and easily to get between 1 and 20€ if you're patient while having a look in the electronic bay. Some nice outputs (C3281/.) and drivers (c4883/a1859) inclusive.

 

[Hennady Kovalsky]

Just some test-fitting...

Are you sure that such a close location of power transformers will not affect each other? The Goss Band is made of copper and is very thin to protect the windings.
You can check their influence on each other by connecting one transformer and measuring the voltage on the second, then turning the transformer to find the position at which the voltage at the output of the unconnected transformer will be minimal.
If it matches the position in the photo, then it will be cool.

 

[nfsgame]

Thanks for the suggestion. I will try it out.

 

[Hennady Kovalsky]

Thanks for the suggestion. I will try it out.

Thank you, 1 transformer per 1 channel is good for a monoblock; for an integrated design it is better to take 1 transformer either with windings divided into channels or with one output voltage for 2 channels. Two transformers in an integral design are old vintage for compactness, not good for sound, but it looks beautiful.

 

[nfsgame]

Brothers from another mother....

 

[nfsgame]

And it's getting to life...

 

[nfsgame]

Ready to rock...