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hybrid amp question
hybrid amp question
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Old 17th September 2014, 11:05 PM   #11
Illinest is offline Illinest
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Join Date: May 2014
Quote:
Originally Posted by famousmockingbird View Post
I think it's like amplifiers, everybody wants to market their amps as "puts out this many watts", and speaker "these are 1000 watts speaker", it's just marketing. Can those pickups put out those large transient voltages? Of course they can , but those peak voltages happen during hard strumming when you attack the strings hard, but for most of the time you are playing the rms voltage can be quite low so they design their amps with lots of gain.




It's simple algebra. Let's use the 20mV to 1V for example.

Amplification factor would be 1/.02 = 50 So it has a gain or amplification factor of 50x, the output is 50 times larger than the input.

We like to usually express things in decibels which is a ratio of two numbers, again simple algebra.

1/.02 = 50

log50 = 1.69897

1.69897 x 20 = 33.97db
That seems like it should've been obvious. There's some other passage that I read once and it keeps circling around in my head but i can't recall it.

I'm still trying to learn how solid state amplification works. I thought i'd be able to find a bunch of solid state pre-amps with amplification factors or dbs listed but i've only found a few so far. There's one in particular that lists 3 db of gain - which i'm sure is not enough. The tonemender isn't the same circuit but it has a similar component count and voltage. I'm suspecting that the tonemender isn't enough gain either.
Maybe i need to search "diy boost pedal"?
I'm going to try that now.
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Old 17th September 2014, 11:32 PM   #12
RTF671 is offline RTF671  United States
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Join Date: May 2008
Location: North Carolina, USA
Here's one I was planning on building myself when I got the chance: The Valve Wizard.
It's from Merlin B, another member on this site. It's supposed to provide 27dB of clean boost.

There's plenty of others out there providing all kinds of boost. Try searching for clean boost if you don't want the pedals to add any distortion before it hits your amp. Here's a few to check out:

Here's the easiest one that will work:
Ruby Amp: Ruby
Run Off Groove has a large number of schematics that should keep you busy a while!

This one is a pedal that mimics the preamp of a Marshall JCM800.
JCM800 sim pedal: StompBoXed - The Guitar Pedal Builders Repository: JCM 800 Emulator Pedal (Marshall Amp Simulator)

This is one of the more popular overdrive pedals which came from the Ibanez Tube Screamer.
TS9: ElectroSmash - Tube Screamer Circuit Analysis
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Old 18th September 2014, 05:17 AM   #13
Illinest is offline Illinest
diyAudio Member
 
Join Date: May 2014
Quote:
Originally Posted by RTF671 View Post
Here's one I was planning on building myself when I got the chance: The Valve Wizard.
It's from Merlin B, another member on this site. It's supposed to provide 27dB of clean boost.

There's plenty of others out there providing all kinds of boost. Try searching for clean boost if you don't want the pedals to add any distortion before it hits your amp. Here's a few to check out:

Here's the easiest one that will work:
Ruby Amp: Ruby
Run Off Groove has a large number of schematics that should keep you busy a while!

This one is a pedal that mimics the preamp of a Marshall JCM800.
JCM800 sim pedal: StompBoXed - The Guitar Pedal Builders Repository: JCM 800 Emulator Pedal (Marshall Amp Simulator)

This is one of the more popular overdrive pedals which came from the Ibanez Tube Screamer.
TS9: ElectroSmash - Tube Screamer Circuit Analysis

That's the ticket!
I think the Glassblower is pretty interesting. I would like to build that. The pcb looks like a commercial product in the pics but I didn't see any references in the bill of materials. I'm confused about the impedance matching of pedals as well. I've never actually used a pedal before. It seems like the tonemender circuit that I was interested in might not react too well to a 9+V signal - as Glassblower advertises itself as capable of making. But if I put tonemender in front of Glassblower (all in the same housing I think...) then I ought to have all of the boost and tone control features that I could ever hope for, true?
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