50w Single-Ended BAF2015 Schade Enabled

[dantwomey]

5 Farads Too goood
Do You go with Kemet caps brand ?
https://www.mouser.fr/KEMET/Passive...MIlLLmveyb4wIVxRd9Ch1hLQdPEAAYASAAEgJCp_D_BwE

40 of these per channel.
Screw Pin Capacitor 100V 120000uF replace 80V 100000uF Electric Vehicle #J29 | eBay

 

[Soundhappy]

@ Dantwomey

Good price for such large capacity, hope quality are ok as well.
After diode bridge first cap can be small ~ 22000 uF then R ( big power wirewound resistor )
next 120 000 uF and L (choke) and one more 120 000uF and is plenty.
Two rails = 0.524 Farad ! Do You need more ?

 

[dantwomey]

@ Dantwomey

Good price for such large capacity, hope quality are ok as well.
After diode bridge first cap can be small ~ 22000 uF then R ( big power wirewound resistor )
next 120 000 uF and L (choke) and one more 120 000uF and is plenty.
Two rails = 0.524 Farad ! Do You need more ?

Just kidding. 66000uf per channel with the two inductors included.

 

[Soundhappy]

My psu be 220 000uF per channel.
Bigger capacitors give bunch of storage energie available.
Too much not mean better sound.
BTW Chassis with heavy heatsinks cost a lot.
Summer climat in France and run of 50 watt´s in Class A is a " Coldcut "

 

[dantwomey]

Recommended voltages for C1,C2, and C3?

Regards,
Dan

 

[juanitox]

C1 35V min
C2 60V min
C3 16V min

Summer climat in France and run of 50 watt´s in Class A is a " Coldcut "

you can try 0.33 for R4 and R5 it will reduce the bias for the summer calor

 

[dantwomey]

C1 35V min
C2 60V min
C3 16V min



you can try 0.33 for R4 and R5 it will reduce the bias for the summer calor

I have some heatsinks the size of a small car so I'm going .22!

 

[dantwomey]

Taken from Sir Rothacher's Ironamp design. The perfect candidate for the bias circuit here?

 

[Soundhappy]

50w Single-Ended BAF2015 Schade Enabled
Work perfectly

 

[Soundhappy]

Taken from Sir Rothacher's Ironamp design. The perfect candidate for the bias circuit here?

My is IXYS mosfet version,
Oh I forget Your is different with SIT so need (-) bias voltage

 

[dantwomey]

My is IXYS mosfet version,
Oh I forget Your is different with SIT so need (-) bias voltage

I'm building the IXFN140N20P version so I'm assuming I'll need a negative gate bias. More homework to do................

 

[Soundhappy]

OK for IXYS amp build this one , is tested Zen Mod version and work like charm with multiturns trimmer

 

[Soundhappy]

I'll need a negative gate bias.

On schematic is positive bias (+) 4.7V for IXYS

 

[dantwomey]

What consumes most of my time is I'm a classic over builder. All of my builds I hand machine the cases usually out of 6mm aluminum plate. This and the fact that I only have a few hours a week to indulge in my hobby makes for long build times. On a most positive note, this gives me more time to come up with creative solutions for layouts, etc. Right now I'm thinking of building something that will hold my capacitors, inductors, and bridge rectifiers in some sort of compact multi-tier package that will make both electrical and aesthetic sense.

Regards,
Dan

 

[Soundhappy]

Yes Dan!

This amp is an interesting construction challenge. Multi layer inside, compact but with good air flow for cooling.

 

[Ben Mah]

So much fun, I think I will join the party too. I can't have too many Class A amps.

I just purchased two large heat sinks from a Canadian ebay merchant. No worries about Canada Customs or brokerage fees.

The heat sinks are 11.75'' x 8.875'' x 5.25'' and weigh 20 pounds each.

I will build them with THF-51S in monoblocks. My Hammond inductor loaded VFET L'Amps sound great. CCS loaded THF-51S with much higher power should be fantastic.

 

[ne5532]

This radiator seems to need to be used with a fan

 

[Ben Mah]

The fins are similar to the fins in Soundhappy's heatsinks (see post #593). The heat sinks weigh 20 pounds each so I am hoping that they are adequate for 200Watts.

Soundhappy,

What are the dimensions and weight of your heat sinks?

 

[ne5532]

Not volume and weight, but structural problems. I think the fins are too dense and not conducive to air flow. Maybe my worry is superfluous.
I use Google Translate.

 

[Ben Mah]

The heatsink will dissipate heat through convection and radiation. Convection may not be the best with the tight spaced fins but the large bulk of fins will radiate quite a bit of heat.

I will find out when I get the amps running. But I am encouraged by Soundhappy's amps with similar heatsinks.