Red Llama CMOS question

[csmatt45]

Hello Amazingly helpful forumers!

I had a red llama question.

I have some NOS  chips on hand and I'm pretty sure 1 will work with a red llama but I just wanted to double check.

The parts list calls for a  CD4049UBE (http://gaussmarkov.net/layouts/layouts.html)

Can I sub one of these??

TC4049BP (8449H printed below "tc4049bp")
MN4049B (there is a "5.2" printed under the "MN4049B" if it matters).

I did a search, and learned a lot, just not this exactly.

thanks in advance,

Matt

[Peter Snowberg]

When digital inverters are used in linear amplifiers, you need to make use of the 4049UB version. UB = Un Buffered. The 4049 comes in two "flavors", the 4049B is a three stage inverter while the 4049UB uses a single stage for each inverter. Either will work, but don't expect the 4049B to sound good, or bad in a good way. Instead the 4049B sounds bad in a bad way which isn't too good. 

You can always build around the 4049B in a socket and sub it when you get the right part.

[Mark Hammer]

Ditto.  The UB suffix version is as common as weeds and just about as cheap.  Get yourself some, and ignore the NOS mjo of the ones you have.

Don't throw them out, however.  I'm sure they will be useful for clocks and other oscillator applications.  They may even be useful for buffering clock lines in flangers.

[csmatt45]

Think rat-shack has 'em?

thanks X2 mark and peter.

matt

[Mark Hammer]

Maybe, but my guess is they'd likely have B rather than UB.  If you live in or near a city of 50,000 or more, there should be an industrial electronics outlet near you that carries them, or a repair shop..

[nelson]

Doesnt pertain particularly to the Llama. However starving a cmos inverter based distortion of current and voltage with seperate controls yields very fun results. Couple that with a nice simple half wave rectified envelope filtered feedback loop and you have a very versatile noisemaker/fuzz.


Sounds very good on bass in particular.