Author Topic: Sparkplug v1 mods: Opamp, transistors, clipping  (Read 1226 times)

lespauldoc

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Sparkplug v1 mods: Opamp, transistors, clipping
« on: December 26, 2014, 09:17:56 PM »
Greetings,
I'm curious to whom has experimented with the Sparkplug and some of its easily tweaked values. I've built 2 now, and have them before me to mess with this weekend. One has 2n7000s which sound a bit more biting/aggressive and the IRs are a bit more spongy/greasy to me. They have the stock opamp in them, but I think a mosfet opamp would match this better, or even a BurrBrown. I'm going to check these out in the morning as the kids are asleep---

Has anyone messed with these yet?


lespauldoc

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Re: Sparkplug v1 mods: Opamp, transistors, clipping
« Reply #1 on: December 29, 2014, 10:50:06 PM »
Ok: The 2n7000 is more aggressive/biting, but less overal gain and drive. SOUNDS FANTASTIC with a typical 4558 opamp though. Best choice IMHO.
As for the IRs, it sounds best with the stock chip and the 2272. The 2272 is a bit more hi-fi and clear, but the sag with the 2262 really makes it work.

mandrewbot3k

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Re: Sparkplug v1 mods: Opamp, transistors, clipping
« Reply #2 on: January 08, 2015, 09:52:16 PM »
thanks for the post.
Andrew

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felipesareas

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Re: Sparkplug v1 mods: Opamp, transistors, clipping
« Reply #3 on: April 28, 2017, 01:39:56 AM »
Please somebody help me:

I want to build it using the 2N7000. The Datasheets and the madbean PDF doc. sugest that the pinout for the IRF510 is Gate-Drain-Source. The same PDF says that in order to use the 2N7000, I should flip it 180. But the Datasheet for it displayed Drain-Gate-Source.

If that was right, shuldn't I swap legs 1 and 2 in order to use it? Sorry if my question is too dumb
« Last Edit: May 10, 2017, 10:10:12 PM by felipesareas »