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7th December 2009, 03:07 AM
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#1 |
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diyAudio Member
Join Date: Jun 2004
Location: Pittsburgh, crumbling wasteland
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Borbely cascode power requirements
I'm going to build one of the small Borbely cascode amps with the 2SK1058/2SJ162 output pair but would like to know how big a toroid to get for a stereo pair? Also what should the bias current be set for? The rails are going to be +/- 24 volts. Thanks.
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10th December 2009, 11:14 PM
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#3 |
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diyAudio Member
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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Iq up from 1A
when you decide what Iq , calculate dissipation per channel , then multiply that with 2,5 (or even more , if you wish) example - PSU +/-24V , Iq 1A , that means 48W dissipation per channel ..... which means at least 125VA xformer for one channel with adequate cooling - I would go to 1A5 Iq , maybe with 2 pairs of output per channel , meaning that each pair have Iq of 750mA good for xconductance ( read - dampingfactor ) etc ...
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11th December 2009, 05:45 AM
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#4 |
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Banned
Join Date: Apr 2005
Location: Stockholm
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astouffer,
linearity improves with increasing Iq. Say 250mA would be sufficient to avoid the most nonlinear portion of transfer characteristic. I would set the bias current with just a resistor. |
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11th December 2009, 01:07 PM
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#6 | |
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diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
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Quote:
By removing Q9. The inherent temperature stability of the Lateral FETs shown do not require a temperature compensated Vbe multiplier. A resistor is sufficient for applying the gate to gate voltage.
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regards Andrew T. |
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