Spooky and Hellraiser SMD 60W amps (Wolverine compatible IPS)

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#221
Anybody need an ARCWELDER ?
Bragging rights ?? 500W of pure Spooky power !
Shown is the spook that the (Wolverine team) did not want. I must adapt it to the new standard.
PS - in this case , you will need the NJW outputs as the driver semi's.
OS
 

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#223
I decided on a 5 pair setup for the Arkwelder.

"Badgerine' now gets it's beta tranny reference from the VAS cascode. We can use low voltage BCxxx for all now. NO saturation ,
absorbed by the cascode led's , same as the Spook ! 40 parts per billion ! 2 pole comp. is cool ,adds another 15db OLG at 10-20Khz.
OS
 

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  • Badgerine fft.jpg
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  • Badgerine schema.jpg
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  • Badgerine.zip
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#224
Full manly .... nice manly sub amp. To drive that 1/2KW 4R/ 40mm Xmax piston woofer.
Go - Go class AB !! Would fit on one side of DIYA's Dissapante 400mm deep 3U.
Arkwelder would at least do 400W/4R with 60V rails. Spook would push a nice "clamped" 110V P-P
through the "manly" sub....

​

OS
 

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#226
Thank you , I have not made that one (badgerine) yet.
BUT , I have made the BIG manly output stage that goes with it. Same as the schema.
If I buy the "dissipante" 3 U , one side will be this OPS.

Build this amp !! Be stunned by the "manlyness" .... 😉 a stereo pair would be killer !
 

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  • Arkwelder screen.JPG
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  • Arkwelder back.JPG
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#227
I went 18mm 1Kuf 80V electro's - wolverine ips fits , my new ips's fit. Fully OCD'ed.
I guess i'll upload this at the beginning post. I would be lying , this is NOT a 60W
output stage. Bipolar , either too small ... or too big !!
OS
 

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#231
Uncle OS.... my present system is 2.1 active cross over system with LM1875 chip amp.
My goal is to make active cross over system with your design,
i need just 50W for my mid speaker (VFA wolf or symasui mini)
and 25W for my tweeter (maybe mini hellriser CFA)
a sub will be later (with VFA spooky).
but im still have problem to convert your 3EF to 2EF
for reason: i want all to fit in 08cmx10cm board from the factory printed board (3EF take too much place)
 
#232
Maybe you wonder why I run at <4mA ? This is a EF3 , very high Z ... 4mA is @ .6W .. most SMD VAS semi's are rated at
1W with NO PCB heatsinking. I'm using about 4 CM/2 FR4 , this rates >1.5W.
I've never seen any through-hole VAS to even get warm @ over 5mA , so the SMD should be good to go.

OS
 
#233
viyohepav said:
Uncle OS.... my present system is 2.1 active cross over system with LM1875 chip amp.
My goal is to make active cross over system with your design,
i need just 50W for my mid speaker (VFA wolf or symasui mini)
and 25W for my tweeter (maybe mini hellriser CFA)
a sub will be later (with VFA spooky).
but im still have problem to convert your 3EF to 2EF
for reason: i want all to fit in 08cmx10cm board from the factory printed board (3EF take too much place)
Click to expand...
All these IPS will run a standard EF2 , just fine. You might have a issue with Pd of the VAS. EF2 likes a 7-10mA VAS.
7-10mA bias needs through-hole TO-126 devices (or) 20 sq. CM on the SMD BJT. (3 sq. inch). The through-hole BJT radiates
through it's larger body into the air. PCB does not make the most ideal heatsink.
I'm trying these SMD VAS BJT's for the first time , I'm not sure how they will do at >5mA. So , I back off to 3.8 mA.

OS
 
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