Sunday, 27 November 2016

Charge Pump Extravaganza

Here's something I've been looking for for awhile now for a project I've got in the works, and figured some of you guys may be looking for the same thing. They're based off of the schematic published by the one and only R.G. Keen, found here.

Layout 1: +9V to +17V



Layout 2: +9V to +25V


Layout 3: +9V to +33V


Remember to watch your electrolytics voltage rating, especially with the +33V charge pump
Note: You can NOT substitute the MAX1044 for 7660s or NE555 IC.

22 comments:

  1. It looks like the "17V Charge Pump" layout is actually the 25V circuit.

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    1. for me they show up in the right position. if you're referring to it based on the schematic, they should be right.

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    2. Here's the problem I see on the 17V layout. One of the 10uF caps should connect between the junction of D1 and D2 to pin 2 of the IC. The cathode of D2 will then be 17V. Likewise there should be a 10uF cap between the junction of D3 and D4 and pin 2. The cathode of D4 will then be 25V.

      The 33V layout has the same connection issues, I don't see any caps connected to the junctions of the diode pairs. But it should correctly output 33V.

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    3. nice spot, you're right. also, the 17V pump is actually 25V. made the corrections.

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  2. I´ve been looking for charge pumps that could supply more that 18v from a 9v source with no success, so thanks so much!
    Could I just throw the 33v charge pump inside a fet build, (let´ say sunn mode T preamp), without damaging the transistors?

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    1. theoretically yes, as long as all your caps are rated over 33V. and you've caught on to what i'm working on. haha

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    2. That was my thought hehehe:D
      And what about the caps on the 33v charge pump layout? Do they need to be above 33v as well?

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    3. A careful reading above answered my question, thanks.

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  3. What kind of current does the 33V deliver?

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  4. verified, i had to as i've yet to be first to verify a layout, i built the 33v one for my none more black build j202's seem like they will work well at higher voltages

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    1. Did you hear a noticeable change in sound/behaviour?

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    2. Not sure if he did, but theoretically you will hear a difference. FETs like higher voltage.

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  5. any idea how much current you can get with those ?

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  6. Really commend your efforts Zach. You dont get enough mate

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  7. Are any of these swappable with the 7660S? I have a number of those and no MAX's! Thanks

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    1. nope. you need a max1044. i should add that to the info actually.

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  8. Could you use this to power a Tiny Giant?

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