CD4049 alternative ???

[Leema]

Can anyone help??

I'm building a circuit which requires 2 CMOS Inverters. The schematic shows the use of a CD4049AE which provides hex inverting buffers - but I dont have one. I dont see the need to go any get one of these because I'm only going to use 2 inverters and this chip is a quad.

Can I use one of the following? : (which I already have stock of)

a 7406   (SN7406N)
a 40106 (HEF40106BP)


Cheerz

[Peter Snowberg]

For inverter fuzzes, the most important part is that the chip you use is unbuffered. It should have a suffix starting with a U such as CD4049UBE. If you don't have the unbuffered version, you probably won't like the results at all.

If the circuit is not dealing with analog but only digital signals, the 40106 may work. Give it a shot. You could also try using a 4001 or a 4011 with the inputs wired together as those will more closely model a 4049 section.

The 7406 probably will not work because I assume the rest of the circuit is wanting CMOS levels. In some circuits, you can sub a 7406 and a 10K pull-up resistor per inverter for a position requiring a 7404, but typically TTL and CMOS don't easily mix without special attention.

Can you provide a link to a schematic?

Take care,
-Peter

[StephenGiles]

The 4009 is a drop in replacement. Someone can probably reel of the differences but my EH Badstone works with either.

[Leema]

Thanks for the replies guys.

The circuit I'm trying to make is called the "Insanity Box". Here is the link:

http://diystompboxes.com/pedals/insanity.GIF

A.N. says it's a CD4049, so I assume this is correct. If you think another part number would suffice then let me know - thanks for your suggestions above - i'll try them out.

[gez]

The circuit I'm trying to make is called the "Insanity Box". Here is the link:

http://diystompboxes.com/pedals/insanity.GIF

A.N. says it's a CD4049, so I assume this is correct. If you think another part number would suffice then let me know

Use an unbuffered chip (has UB as part of the code).  Apart from the 4049UB you could probably use a 4069UB or even a 4007UB wired as inverters, though these have different layouts and aren't direct replacements.

4007s have a more Marshall like vibe to my ears (more crunch), but the intermodulation distortion is poorer that chips like the 4049.

[Greek Acrobat]

Good to see you found us here.

Sorry I wasn't of more help before. Good luck with the circuit.

[et3422]

I'm going to attempt to build an insanity box using a Texas Instruments CD74HCU04-Q1 chip
available as free samples.  Wish me luck.

[Mark Hammer]

I have a schematic of a Japanese circuit in my collection that uses a 74HCU04 in a configuration almost identical to a Red Llama or one of Frank Clarke's "Hot Harmonics" series.  It should work where a 4049 does.