Home » Audio » Thermionic Emissions » Darling 1626 PS suggestions--first design.
Darling 1626 PS suggestions--first design. [message #9857] Tue, 07 November 2006 18:11 Go to next message
Shane is currently offline  Shane
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Registered: May 2009
Illuminati (3rd Degree)

Here are a couple of PS designs that Norris, Jef, and I have contemplated for the Darling amp I'm building. I have both of the chokes and some 25uF motor runs, but that's it for now. The first PSUD pic is using a Hammond 270DAZ trannie. The second choke loaded is using a 273X.

second design. [message #9858 is a reply to message #9857] Tue, 07 November 2006 18:13 Go to previous messageGo to next message
Shane is currently offline  Shane
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Registered: May 2009
Illuminati (3rd Degree)

.. I'm looking to get around 270V on the B+. and will be running a 5965 driver. 25-26mA on the 1626 and 4mA per side on the 5965.

Re: second design. [message #9860 is a reply to message #9858] Wed, 08 November 2006 22:28 Go to previous messageGo to next message
Forty2wo is currently offline  Forty2wo
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Master
I vote # 2.
As the current demands of the Darling are fairly low, try modeling with lower value, lower DCR, chokes. Say 4-7 h …John

How about this [message #9861 is a reply to message #9860] Thu, 09 November 2006 09:12 Go to previous messageGo to next message
Shane is currently offline  Shane
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Registered: May 2009
Illuminati (3rd Degree)
Thanks John. The reason for the 10H chokes is because that's what I happen to have. LOL!!

How about this. Use the 10H choke first with a 40uF cap, then branch off with individual 4H chokes and another 40uf cap per channel?

Also, I've seen where some have put a very small value cap between the rectifier and PT secondaries? But obviously no way to model this in PSUD.

Re: How about this [message #9862 is a reply to message #9861] Thu, 09 November 2006 22:08 Go to previous message
Forty2wo is currently offline  Forty2wo
Messages: 163
Registered: May 2009
Master
What I had on hand. Those words loom large in my legend.

The supply you propose will work well.

As to the cap across the secondary. If it is a very small value, .1uf or so it is there to shunt power line hash. Not a bad idea at all. A larger value is a "cheater cap" used to tune the output voltage.

A pure choke input filter will give you about 66% of your transformer secondary voltage. A cap input about 140%. As you increase the size of the cap you move from one mode to the other…John


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