other old amp schematic

tadiam · 14th December 2007, 12:42 PM

my next project......maybe.... 40w 8r
to diy comunity

OOOPS is this

richie00boy · 14th December 2007, 01:12 PM

That schematic has mistakes - look at the 5k6 resistor.

wg_ski · 14th December 2007, 02:18 PM

And I don't know why everyone insists on making that resistor too big. According to my calculations the 5.6k should be around 3k. As it is, the differential balance is going to *really* suck, if it even works at all. It needs to drop .8 volts or so at half the total LTP current - which, IMO, is too low to begin with.

And of course the resistor needs to be moved.

tadiam · 14th December 2007, 02:46 PM

I copy this from an old publication....
ok
what components exchange for better use?

DigitalJunkie · 14th December 2007, 03:28 PM

Are those two '4148 diodes connected properly?!

14th December 2007, 01:12 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	That schematic has mistakes - look at the 5k6 resistor. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

14th December 2007, 02:46 PM	#4
tadiam diyAudio Member Join Date: Mar 2007	re I copy this from an old publication.... ok what components exchange for better use? __________________ audio

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14th December 2007, 02:18 PM	#3
wg_ski diyAudio Member Join Date: Oct 2007	And I don't know why everyone insists on making that resistor too big. According to my calculations the 5.6k should be around 3k. As it is, the differential balance is going to really suck, if it even works at all. It needs to drop .8 volts or so at half the total LTP current - which, IMO, is too low to begin with. And of course the resistor needs to be moved.

14th December 2007, 03:28 PM	#5
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Are those two '4148 diodes connected properly?!