Charge Pump perf layout, ~80 volts from 12 volt supply - Good for your tubes!

[frequencycentral]

This layout is based on R.G.'s +18, +25, or +33 from one 9V battery. It will give out ~80 volts from a 12 volt supply, however this will drop a little when loaded. Multiple voltages are available by tapping off at the appropriate points.

I used it to supply the plates of my Murder One tube amplifier. I used a Maxim MAX1044, but you should note that the maximum rated voltage for the MAX is 10.5 volts, so there may be some risk of part failure running it at 12 volts. I've run mine for many many hours both on the breadboard and in builds without part failure. If you're using a 9 volt supply this obviously isn't an issue. If you want to run from a 12 volt supply (a voltage which tube heaters like), consider putting a few 1n4148 (two or three) between the 12 volt input and the MAX's pins 1 and 8, this will lower the voltage that the MAX sees (and therefore the output voltage) to a level it is rated to handle.

The layout should also work with Maxim ICL7660 and Microchip TC1044. The TC1044 is cheaper and rated for a 12 volt input.

All the capacitors are rated at 100 volts. All the diodes are 1n4148, a little lossy but cheap.

It's a really tight build, with a couple of things to take note of:

- the diodes share holes, not really a problem, as their legs are pretty slim!

- the negatives of C1 through to C6 are linked together on the component side of the board, this need to be done as you add the caps. I used cut off diode legs for the links.

- all other links are on the copper side of the board.

Maxim MAX1044/ICL7660 data sheet

Microchip TC1044 data sheet

I highly recommend that you gain a full understanding of this circuit by reading R.G.'s +18, +25, or +33 from one 9V battery article, and by studying the schematic contained in that article.



Here's a similar build I just completed:

[svstee]

Awesome! I was planning on making a layout, but this one will actually work!

[bancika]

would this work with MAX630? That's the only one they have in the local store..
tnx

[Ripthorn]

I'm not sure the 630 would be able to get as high of a voltage, in addition, you would need inductors along with caps and diodes to get the job done.  I would go for an order from mouser or digikey, as single units of the TC1044 are about $1.

[bancika]

the thing is, I'm not in the USA these days...but I found max at banzai, maybe I could get it from them...
thanks

[candletears7]

I'm bringing this thread back up - Rick, thanks so much for this layout! I have looking for a layout from that exact schematic for around the 33v to 35v mark.
That being the case, for this layout with a 9v supply in, would I just tap off at D6's stripe end (i guess the left hand side of D6 on your layout) to achieve around 33v, link the negative side of C4 to ground, and that would be pretty much it, as it's just a case of multiples to get higher voltages?
Cheers!

[frequencycentral]

Yes that's exactly right, each set of 2 diodes and 2 caps adds another (almost) 9v (if you're using that supply voltage). Here's a smaller neater version of the same sort of thing:

[candletears7]

Good man, O' Perf Master! Thanks and appreciation! 

[Isak]

Hi Rick and guys.

i will want to to use this charge pump with 12AU7.
as i understand, the power supply dont have to be regulated before going in the charge pump?
meaning, can i connect my 12VAC directly to the charge pump and from there to the 12AU7?
i'm gonna use 7660S instead the max1044, should i worry about the oscillator freq from the 7660S?
this will be the scheme i'll be using:


i thank you in advance.
Isak E.

[samhay]

^ 12VAC
No - fairly certain you need to feed it DC, not AC. I guess you could put a 7812 regulator between your AC supply and the 7660s.

^should i worry about the oscillator freq from the 7660S?
Not if you connect pins 1-8.

I think you need to take a look at the datasheet:
http://www.intersil.com/content/dam/Intersil/documents/icl7/icl7660s.pdf

[duck_arse]

^ 12VAC
No - fairly certain you need to feed it DC, not AC. I guess you could put a 7812 regulator between your AC supply and the 7660s.

your AC supply, a DC rectifier/filter, then a 7812 regulator and the 7660s.

[samhay]

^ a DC rectifier/filter

yes - a very good point