Modified AMZ MosFET Booster

MartyMart · February 23, 2007, 04:49:42 AM

That's interesting Jack, I've seen several builds using Mosfets and recommending
the use of an LED ......
Time to order some more zeners !!

MM.

amz-fx · February 23, 2007, 07:28:57 AM

You can also use a pair of 1N914 diodes... one from the V+ to the gate (anode to gate) and the other from the gate to ground (cathode to gate). This type of protection is used in cmos chips and was originally used in the SHO.

regards, Jack

markm · February 23, 2007, 01:06:34 PM

Quote from: amz-fx on February 23, 2007, 07:28:57 AM
You can also use a pair of 1N914 diodes... one from the V+ to the gate (anode to gate) and the other from the gate to ground (cathode to gate). This type of protection is used in cmos chips and was originally used in the SHO.

regards, Jack

This would replace the Zener diode and work just as well as the Zener?

Barcode80 · February 23, 2007, 04:19:03 PM

Quote from: markm on February 21, 2007, 07:10:46 AM
Quote from: Barcode80 on February 20, 2007, 10:53:41 PM
can it be built on the pcb from ggg? is it merely a parts change out?

It's simple actually,
Ground the "Gain" pad on the layout and hook up a 100K pot to the output and that's about it.

i'm a tad confused. part of that might be because i meant to say the tonepad layout, not the ggg one. also, i'm not sure what you mean by the "gain" pad.

markm · February 23, 2007, 05:38:42 PM

Okay.
From the TP Layout, hook a jumper from the pad that Lug 3 of the gain pot is wired to ground.
Take your output from the .1uF cap and hook that up to lug 3 of an A100K pot.
Lugs 2 and 3 to ground.
That'll do it.

I'm working on another right now with both Gain and Volume controls.
Next.....an OD circuit I think.

fikri · February 24, 2007, 11:04:19 AM

Does changing the voltage may take a good result ? ie. increase headroom ?

markm · February 24, 2007, 11:40:38 AM

Quote from: fikri on February 24, 2007, 11:04:19 AM
Does changing the voltage may take a good result ? ie. increase headroom ?

Do you mean upping the voltage to say 18V?
I don't think it's neccesary.

ADR · February 27, 2007, 04:02:45 PM

I'm going to be experimenting with this on the mosfet boost, to be engaged with a DPDT switch and a mix knob.

http://www.muzique.com/lab/tclip.htm

I've always wanted to make a multiband overdrive. One that keeps the lower range nice and tight and crisp and one that overdrives and compresses the upper range.
That way I keep some snap on the lower strings and some creamy overdrive for soloing.

I'm also going to try this approach with a rat clone I'm building.

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Modified AMZ MosFET Booster