There's brute force, ans ZM says, and then there's overkill... 🙂 🙂 🙂
Two 400VA transformers is complete overkill, in my opinion. (of course, it will work, and quite well...) I would much rather use (2) 200VA (or 150VA) with really nice shields or shielded and potted.
Two 400VA transformers is complete overkill, in my opinion. (of course, it will work, and quite well...) I would much rather use (2) 200VA (or 150VA) with really nice shields or shielded and potted.
from my experience - one CL60 per 400VA Donut is good even on 230Vac
naah ...... nothing wrong with overkill
in Papa's Koan , I'm using 800VA Donut , with 4 x 18Vac secondaries .... so everything after is dual mono , so entire amp is semi-dual mono
in Papa's Koan M2 , I'm using two 350VA Donuts , one per channel
considering that I'm not moving them often , amount of my pleasure is greater than any possible drawback
remember Papa's pajamas picture ......
though , my M2 is just 26.5 kg ..... that would be 4.14 stones
though , my M2 is just 26.5 kg ..... that would be 4.14 stones
Did I get it right? Green are GND lines. Dual CL60's on each transformer since I am using single 230V primaries?
Probably not necessary, but my dual mono F-5 build I had separate grounds for the CL-60s, and two separate power cords. In case amp is accidentally sawed in half😀😀😀
Russellc
capacity per rail?
hahhh : ) my diy-a-universal PSU boards arrived. I will also make dual mono (F5/F6) and thereby some questions came up concerning what ELCOs to buy.
the recommended value per rail is about 60000uF.
-"per rail" does mean a half channel in a bipolar supply? So the board has to be stuffed with 8x15000uF and for shure 8x22000 won´t be overkill?
My transformers are two 230V 250VA (2x18V) donuts.
tnx
stefan
hahhh : ) my diy-a-universal PSU boards arrived. I will also make dual mono (F5/F6) and thereby some questions came up concerning what ELCOs to buy.
the recommended value per rail is about 60000uF.
-"per rail" does mean a half channel in a bipolar supply? So the board has to be stuffed with 8x15000uF and for shure 8x22000 won´t be overkill?
My transformers are two 230V 250VA (2x18V) donuts.
tnx
stefan
tnx,
do you use 35V or the regular 25V?
the blue Vishays are extremly cheap (3€) vs 7€ for the panasonics. But maybe the Panasonics are better. Also the Cornell Dulblier should be good.
stefan
do you use 35V or the regular 25V?
the blue Vishays are extremly cheap (3€) vs 7€ for the panasonics. But maybe the Panasonics are better. Also the Cornell Dulblier should be good.
stefan
I just used 25V however if you can afford the 35V caps it will make your power supply more versatile for future more powerful amps.
I just ordered these:
LGY1V153MELB45 Nichicon | 493-8643-ND | DigiKey
for my universal power supply board. 35V and 105°C, as they are used in a class A amplifier, which will get HOT.
LGY1V153MELB45 Nichicon | 493-8643-ND | DigiKey
for my universal power supply board. 35V and 105°C, as they are used in a class A amplifier, which will get HOT.
Use 35V caps, since a 25V cap won't last nearly as long. Get these while you can.
I parallel two in each location, 44mF-R-44mF in each rail in each channel (dual mono).
ECO-S1HP223EA - Panasonic, Capacitor Aluminum. Order from Arrow Electronics.
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Old habits die hard is only what I wish to say. Some people blindly follow published projects.
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