Deluxe Electric Mistress With TC1044 ???

[WLS]

I am about to build a Deluxe Electric Mistress using the schematic from GGG's site. http://www.generalguitargadgets.com/index.php?option=com_content&task=view&id=123&Itemid=26 I plan on using his PCB template with a minor adjustment.

I don't want to do the 18V transformer that is in the project, but instead use a 9v battery and adding the TC1044 charge pump, with two 10 uf polarized caps. Instead of using two 1n4001 rectifiers. I was going to use the 1n4002 instead.

Why?

Simply because I have some laying around.

Reason is from what I read their is already a 9 volt version, but it does not have the same punch as the 18 volt setup. Also I can use my 9 volt power supply or run off the battery.

I was told that the charge pumps interfere with the sound quality, but my PT-80 uses this setup without any audible effects.

I don't see a problem with this but I would like a second opinion on the pros and cons of making such a change.

[StephenGiles]

Better to use 2 x 9v batteries

[MarcoMike]

I'm on the other side: charge pump is the way to go! also because I'm not a great supporter of batteries... with charge pump you can power the pedal also with a common power supply and when you reach a certain number of pedals you'll have to switch to PS anyway (unless your last name is Duracell)

[WLS]

Better to use 2 x 9v batteries

Why would 2 9v batteries be better?

I am curious as to what advantage can be obtained by doubling up the 9v.

Both ways they dever the same amount of power to the box.

I'm on the other side: charge pump is the way to go! also because I'm not a great supporter of batteries... with charge pump you can power the pedal also with a common power supply and when you reach a certain number of pedals you'll have to switch to PS anyway (unless your last name is Duracell)

As you stated and on of my reasons for this conversion is the flexibility of using the same power source for all my boxes.

At least for now...

The TC1044 when connecting the boost makes it as quite as a mouse and I feel is abetter chip than the MAX1044.

Or maybe I am missing something?

Oh' by the way my last name is not Duracell, and I am not related to the Energizer bunny either.

[StephenGiles]

I meant that I would always use 2 x 9v batteries rather than a charge pump.

[WLS]

I meant that I would always use 2 x 9v batteries rather than a charge pump.

Not to put you on a spot and nothing is ment by this. I am fairly new at buiilding FX boxes and I am seeking wisdom from the great minds that visit this fourm.

So, if their is a reason besides a personal preference to use 2 9v batteries VS a charge pump.

Please enlighten me!

In the year I've been reading and doing this craft I've learned a lot, but I have barely scratched the surface.

[oldschoolanalog]

Use The Search Function (UTSF)
"Heterodyning"

[StephenGiles]

I meant that I would always use 2 x 9v batteries rather than a charge pump.

Not to put you on a spot and nothing is ment by this. I am fairly new at buiilding FX boxes and I am seeking wisdom from the great minds that visit this fourm.

So, if their is a reason besides a personal preference to use 2 9v batteries VS a charge pump.

Please enlighten me!

In the year I've been reading and doing this craft I've learned a lot, but I have barely scratched the surface.

Well, I know that 2 x PP3 will provide the voltage I need, whereas a charge pump - well, I can't be bothered with them, just that

[WLS]

Use The Search Function (UTSF)
"Heterodyning"

Very good point and I guess for good reason why Stephen can't be bothered with them.

The TC1044 has boost that is suppose  to bring the clock F osc up to 45 Hz. So, even if it does attache itself to the BBD signal it should be out of range.

I wasn't going to breadboard this project but with this in mind I decided that maybe I should.

So it was a good thing I started. I decided to use 220 uf polarized caps to raise up the voltage from the charge pump. When I put in the ML78L15AC by STMicroelectronics
the voltage reading was above the fifteen volts required. Tried a second one with a different reading but the same result. So much for being in-disstructable!

Since I didn't have any more of the ML78L15AC I found some MC78L15ACP by Fairchild laying around and popped one in and there it was just a little below fifteen volts.

The only difference in the schematic and the layout is the addition of the TC1044SCPA by Microchip Technology and the secound 220 uf polarized cap is before the regulator.