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Old 8th June 2008, 04:48 PM   #1091
Manu is offline Manu  Europe
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Old 8th June 2008, 05:59 PM   #1092
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Here's my latest version -- with compensation on the input (150pF), a place for the resistors to adjust the resistors on the source of one MOSFET and one JFET. I use TO-220's for the feedback resistor as I have plenty in stock:

Click the image to open in full size.
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Old 8th June 2008, 06:15 PM   #1093
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I'm going to suggest that if you want to allow trim on the Source
of a MOSFET and JFET that you allow for both sets, since the need for
trim tends to be random in polarity.
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Old 9th June 2008, 02:11 AM   #1094
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Quote:
Originally posted by EUVL
If you have a low impedance speaker, you need more current rather than voltage. You can of course start paralleling matched output devices (e.g. using 2 pairs of MOSFETs will give maximum power at 4 ohm). But paralleling MOSFETs will change the frequency dependent characteristics of the amplifier.


Patrick
Practically speaking, does that mean that the circuit would have to be completely reoptimized to add another pair of MOSFETS?

Looneytunes
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Old 9th June 2008, 02:42 AM   #1095
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Optimization is individual, even within a given design.

You can simply parallel output devices and it will work fine, but
if you tweak some of the resistor values, you can get the most out
of it. This is also true of the published circuit. Most examples meet
a .002% spec at 1 watt, but some run a little higher, and you can
tweak them down. Similarly with the bandwidth.

So if you have a scope and a distortion analyzer, you can always get
a little better.
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Old 9th June 2008, 03:33 AM   #1096
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Thanks Nelson.

And thank you for sharing your designs and knowledge with Newbies like me. I'm building this, and I'm sure that I'm going to learn A LOT!

Wynn
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Old 9th June 2008, 07:47 PM   #1097
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Quote:
Originally posted by bogdan_borko
BTW I`d like to hear what mr.PAss thinks of this PCB design of mine?

Thanks in advance.
CHeers.
Borko.
And THANK YOU for your kind generosity. As CHairman of the ETOOTL WORLD CAUCUS (EITHER TO OLD OR TO LAZY) I can tell you that ASSUMPTION to your particular Paradise is secure.
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Old 9th June 2008, 08:39 PM   #1098
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Quote:
Originally posted by sandstorm33


And THANK YOU for your kind generosity. As CHairman of the ETOOTL WORLD CAUCUS (EITHER TO OLD OR TO LAZY) I can tell you that ASSUMPTION to your particular Paradise is secure.

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Old 9th June 2008, 10:03 PM   #1099
bongo99 is offline bongo99  United States
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Any PCB group buy for F5 yet?

Love to build one.
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Old 9th June 2008, 10:57 PM   #1100
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Quote:
Originally posted by bongo99
Any PCB group buy for F5 yet?

Love to build one.

Betcha it happens!!!
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