Charge Pump Issue

[bootsytakes6]

Have you read this thread?  IT appears that using a chargepump is not wise with the Neovibe/ForumVibe.

Is the TC1044S any different than the Max1044?

http://www.diystompboxes.com/smfforum/index.php?topic=42888.0

I've read it now....never considered that. I didn't notice any differences on the datasheets, but I was mainly looking at the pinouts for the IC to see if they matched up.

So, basically the pump doesn't put out enough current to run the 12V-60mA incandescent bulb in the center of my board? I have a 12V-40mA bulb lying around, but that's too much current too it seems from reading that post.

The LT1054 does the same job as the TC or the MAX, and have the same pinout (I believe), but it puts out 100ma, that should do the job for you. A bit more expensive though.

Looks like they do have the same pinout, I'll give that one a try and get back to debugging if it doesn't clear up the issue. Thanks for the information fellas.

[solderman]

The LT1054 does the same job as the TC or the MAX, and have the same pinout (I believe), but it puts out 100ma, that should do the job for you. A bit more expensive though.

Smallbear has the lt1054 for $1.70 and the MAX1044 for $3.50.  So that one is cheaper there!

It all comes down to where you live and how well your postal service does there customs Job.
If you live outside the US and you get tax on a smallbear parcel its expensive othervise not. same goes for if you use EU shops outside EU ore else ware. Australia for example. Its the overall final price that is interesting. Its easy to forget that we are a global comunity 

//Solderman

[orangetones]

Just out of interest, why not just power your Forum Vibe with a wall wart?  They don't cost much, and you don't have to go through the trouble of dealing with the chargepump.

[WLS]

Looking at the datasheets for the MAX and the TC, pin 6 is labeled as "LV." The TC1044S datasheet says it stands for Low Voltage. It apparently should be connected to ground when V+ is < 3.5V:

Thanks Mike, great info. 

So thats pin 6, but what about pin 5? 

I believe this is only true when the boost is not in use and would not apply to this circuit.

[bootsytakes6]

Just out of interest, why not just power your Forum Vibe with a wall wart?  They don't cost much, and you don't have to go through the trouble of dealing with the chargepump.

No trouble really in the big scheme of things. I had a couple options to power the ForumVibe in mind at first: A typical wall wart, and a Y-cable for my Pedal Power 2.

The wall wart could plug into the back of my PP2, but I'd have to unplug it everytime I moved the board to it's case, that's a PITA to me. Been there, done that with a Microsynth on my old bass board.

The Y-cable was a decent option, but it takes up two outputs on the PP2 to provide 18V and I have 7 items my board I'm powering now. That means something would have to go to make room to power the FV.

Too, I like things to be compact and self contained. The idea of a using charge pump came to mind so I decided to try it out. Also, it's been a learning experience just as my whole time in the effects hobby has been, and will continue to be.