AtomBoy
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- Apr 22, 2005
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I'm planning a low-buck P2P/Dead Bug scrappy Borbely Hybrid.
The article is here:
http://www.borbelyaudio.com/pics/405borbely2506.pdf
It calls for dual power supplys for left/right of +-24V 100mA or +-15V 160mA and a third +6.3V 350mA (I'm planning on 700mA for both) for the tube heaters.
You can buy the recommended kits from Borbely which I'm sure are fantastic, but I'm going cheap-o caveman here. Between looking at the data sheet for the LM337, Tangent's STEPS, and some Google hits I've cooked up the following:
T1 = TE62034-ND TRANSFRMR TOROID 18V .388A
T2 = TE62031-ND TRANSFRMR TOROID 9V .778A
Most of the rest of the part names and values are from Tangent's STEPS parts sheet:
http://www.tangentsoft.net/elec/teps/plists.html
I've left some parts out for the sake of simplicity and budget.
Questions:
1) What am I buying with the dual PS? Is it really worth it if they're sharing the rectifier and the filtering caps? It's not a hell of a lot of parts, so I'm inclined to just do it.
2) Where is the sweet spot on the filtering caps? I'm going to start with 4x1000uF 50V and leave room for more.
3) Have I left out a $.50 part that would make a huge differance?
4) Is the TO-220 the right package for the LM137s and LM337s?
5) What bone-headded error did I make in transformer selection/ layout/ other that will result in tears/ insurance claim/ obvious hum?
Cheers!
Edit: The diodes are pointing the wrong direction on both rectifiers.
The article is here:
http://www.borbelyaudio.com/pics/405borbely2506.pdf
It calls for dual power supplys for left/right of +-24V 100mA or +-15V 160mA and a third +6.3V 350mA (I'm planning on 700mA for both) for the tube heaters.
You can buy the recommended kits from Borbely which I'm sure are fantastic, but I'm going cheap-o caveman here. Between looking at the data sheet for the LM337, Tangent's STEPS, and some Google hits I've cooked up the following:
T1 = TE62034-ND TRANSFRMR TOROID 18V .388A
T2 = TE62031-ND TRANSFRMR TOROID 9V .778A
Most of the rest of the part names and values are from Tangent's STEPS parts sheet:
http://www.tangentsoft.net/elec/teps/plists.html
I've left some parts out for the sake of simplicity and budget.
Questions:
1) What am I buying with the dual PS? Is it really worth it if they're sharing the rectifier and the filtering caps? It's not a hell of a lot of parts, so I'm inclined to just do it.
2) Where is the sweet spot on the filtering caps? I'm going to start with 4x1000uF 50V and leave room for more.
3) Have I left out a $.50 part that would make a huge differance?
4) Is the TO-220 the right package for the LM137s and LM337s?
5) What bone-headded error did I make in transformer selection/ layout/ other that will result in tears/ insurance claim/ obvious hum?
Cheers!
Edit: The diodes are pointing the wrong direction on both rectifiers.