Has anyone done an F5 with a 12 vdc power supply?

gcb34 · 29th October 2011, 09:00 PM

I want to be sure my amp is 2 wpc. Will 12 volts do that for me?

seanvn · 29th October 2011, 10:34 PM

That's an F6 on that one.

h_a · 30th October 2011, 10:47 AM

Well, I wouldn't go lower than 12 V; you might also think of lowering the bias current if you require your amp to dissipate less heat.

Hannes

juma · 30th October 2011, 11:03 AM

Quote:

Originally Posted by gcb34

I want to be sure my amp is 2 wpc. Will 12 volts do that for me?

12V wouldn't be feasible for big HEXFETs used in standard F5 (parasitic capacitances play crazy at such a low Vds).
I did try the low-power version of F5 and the best way to do it (IMO) with +/-12V is to use two pairs of 2sk2013/2sj313 per channel (buzzforb and Zhou Fang have them for sale) as output devices, biased at 400mA per MOSFET.
I routinely omit protection circuit (Q5, Q6) but if you intend to keep it, R17-R20 should be recalculated (F5 manual explains how).

6L6 · 30th October 2011, 03:01 PM

If I may ask, why do you want it to be exactly 2 watt output?

29th October 2011, 09:00 PM	#1
gcb34 diyAudio Member Join Date: Jan 2008	Has anyone done an F5 with a 12 vdc power supply? I want to be sure my amp is 2 wpc. Will 12 volts do that for me?

30th October 2011, 10:47 AM	#3
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	Well, I wouldn't go lower than 12 V; you might also think of lowering the bias current if you require your amp to dissipate less heat. Hannes __________________ fresh matched IRFP240/IRFP9240 fets \|\| AlephJ/JX-kits F5 transistor kits \|\| Burning Amp BA-1/2/3 transistor kits

30th October 2011, 03:01 PM	#5
6L6 diyAudio Member Join Date: Oct 2010 Location: Denver, Colorado	If I may ask, why do you want it to be exactly 2 watt output? __________________ Pass Labs Pearl Phono -- Pass B1 Preamp -- Pass F5 amplifier -- Pass Labs Pearl 2

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29th October 2011, 10:34 PM	#2
seanvn diyAudio Member Join Date: Sep 2010	That's an F6 on that one.

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