Red Llama Mk.II gut shots.
- MoonWatcher
- Diode Debunker
Who manufactures that MC14049UBCP?The Rotagilla wrote:I wouldn't have bothered but this thing is noticeably quieter at idle than other Llama layouts I've built.
The IC is a MC14049UBCP.
The reason I ask is that some inverters are a lot quieter than others. The (now obsolete) Fairchild CD4049UBCN is whisper quiet compared to others.
I think the Texas Instruments CD4049UBE is the noisiest one of tried. It's enough to make someone completely turned off to building more than one Red Llama project, let alone other inverter stuff.
I'm assuming the IC in your pedal is made by ON? But I really don't want to assume. I'm going to have to mail order a handful of these things to find out if one chip is really more quiet than the other, and don't want to end up on a wild goose chase. I noticed that ST Micro currently produces one too, but I've never had anything decent by them (my 741 ST Micro was hiss city).
I don't think it would be worth Dunlop's trouble to use an obsolete version of this chip (like one made by Motorola or something), but the fact that the MkII uses those Mal 150's makes me a little nervous. I know those caps are current production, but they are just a goofy choice (although they do look cool).
Thanks in advance. I've got about 6 TI 4049's that I'm ready to just throw in the trash.
- The Rotagilla
- Diode Debunker
Sorry it took so long to respond. Yes, it's made by ON.MoonWatcher wrote:Who manufactures that MC14049UBCP? I'm assuming the IC in your pedal is made by ON?The Rotagilla wrote:I wouldn't have bothered but this thing is noticeably quieter at idle than other Llama layouts I've built.
The IC is a MC14049UBCP.
The television will not be revolutionized.
- MoonWatcher
- Diode Debunker
No problem, and thanks so much. A quieter 4049 is a most welcome thing. I hope the ON chip is the reason that the new Llama is quieter. It's a cool pedal to work the guitar's volume control with, but not if the background noise is so high!The Rotagilla wrote:Sorry it took so long to respond. Yes, it's made by ON.MoonWatcher wrote:Who manufactures that MC14049UBCP? I'm assuming the IC in your pedal is made by ON?The Rotagilla wrote:I wouldn't have bothered but this thing is noticeably quieter at idle than other Llama layouts I've built.
The IC is a MC14049UBCP.
- The Rotagilla
- Diode Debunker
I sourced some and they arrived yesterday, I'll report back.MoonWatcher wrote:The (now obsolete) Fairchild CD4049UBCN is whisper quiet compared to others.
The television will not be revolutionized.
- The Rotagilla
- Diode Debunker
No less noise with the Fairchild CD4049UBCN, go with the MC14049UBCP.The Rotagilla wrote:I sourced some and they arrived yesterday, I'll report back.MoonWatcher wrote:The (now obsolete) Fairchild CD4049UBCN is whisper quiet compared to others.
The television will not be revolutionized.
Info and schematic for the Red Llama 25th Anniversary reissue with Hi Cut control here:
viewtopic.php?f=7&t=31099
The Rotagilla wrote: ↑15 Mar 2012, 07:29 The IC is a MC14049UBCP and all the resistors appear to be standard Llama value except for the circled one...
While researching implementing a tone control for the Tube Sound Fuzz/Red Llama, I ran across this thread.
After carefully examining the gut shots here, and schematics for the Red Llama MkII found elsewhere, I have discovered that this thread contains a major error...
The current limiting resistor (R6) from the +9v supply to the circuit is NOT 1K ohms, as in the original Red Llama.
R6 is 100 ohms. The color bands (brown,black,black,black, brown) indicate 100 ohms/1%, NOT 1k.
In addition, the board traces CLEARLY show that R6 is present ONLY in the connections to the unused inverter inputs.
Pin 1 (vcc) of the MC14049UBCP is connected DIRECTLY to The 9v supply, NOT through R6.
In other words, there is NO current limiting resistor present in the main 9v supply to the 4049 IC.
This is strange, and very different from the design of the original Red Llama, the 25th anniversary reissue, the Craig Anderton Tube Sound Fuzz, or any other 4049-based overdrive designs I've seen.
I wonder why Way Huge decided to eliminate the dropping resistor in the MkII?
And might this partially explain why the MkII circuit is so quiet?