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.
Posted by at 05:11
Tags: ,

42 comments:

  1. EddieB27 November 2016 at 06:40

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

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    1. Zach27 November 2016 at 08:55

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

      Delete
    2. EddieB27 November 2016 at 19:44

      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.

      Delete
    3. Zach27 November 2016 at 20:11

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

      Delete
  2. Unknown27 November 2016 at 07:01

    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. Zach27 November 2016 at 08:52

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

      Delete
    2. Unknown27 November 2016 at 22:34

      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?

      Delete
    3. Unknown27 November 2016 at 22:41

      A careful reading above answered my question, thanks.

      Delete
  3. Arnold Dikstaal27 November 2016 at 11:48

    What kind of current does the 33V deliver?

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  4. Unknown27 November 2016 at 12:42

    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. Unknown28 November 2016 at 00:38

      Did you hear a noticeable change in sound/behaviour?

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    2. Zach28 November 2016 at 13:32

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

      Delete
  5. Unknown27 November 2016 at 12:57

    any idea how much current you can get with those ?

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  6. Unknown27 November 2016 at 23:28

    Tayda´s provide 20mA.

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  7. Moda28 November 2016 at 10:08

    Really commend your efforts Zach. You dont get enough mate

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  8. Piltdown Man29 November 2016 at 02:15

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

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    Replies
    1. Zach29 November 2016 at 03:30

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

      Delete
    2. Piltdown Man29 November 2016 at 03:56

      I had a feeling. Thanks

      Delete
  9. joeychickenskin1 December 2016 at 13:39

    Could you use this to power a Tiny Giant?

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    Replies
    1. Unknown10 May 2018 at 16:22

      Nope. The max1044 provide 20mA and the tiny giant needs up to 120mA.

      Delete
  10. Sensei Tim12 January 2017 at 06:04

    For the 33v layout, the number of cuts is off by one, and so is the number of rows.

    I cut my vero 1 row too small, but found that if you add a cut a column L row 1 and move the three components that join on the bottom row to the top row you can save yourself a bit of space.

    I'm planning to use this to drive the H&K redbox instead of using phantom power. Wish me luck!

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  11. Sensei Tim14 January 2017 at 06:52

    33V layout verified. woohoo!

    ReplyDelete
  12. Unknown14 February 2017 at 23:20

    Be careful when cutting the vero.
    All layouts have one row missed at the size info notes.

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    Replies
    1. Zach15 February 2017 at 00:27

      Thought I fixed that. I guess I forgot to reupload it. I'll take care of that tonight.

      Delete
  13. Jcows28 June 2017 at 01:55

    I put this infront of a tube screamer (son of screamer) and theres very little difference? I was expecting more headroom and tighter tone? Any knowledge anyone could share concerning this?

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    1. mirosol28 June 2017 at 06:08

      Just personal experiences. Opamp based circuits rarely sound any different when fed anything from 5V to 18V. The headroom you were expecting could be achieved by using a swing of +9V/-9V or +12V/-12V, like seen in Maxon OD820 and the like.

      So to my knowlwdge, there is little to no point in using a pump with standard tubescreamer circuit. I've tried it myself back in the day too. If you have a lab supply, you could try the circuit without a pump and change the supply voltage gradually from 5V to 18V. I can tell you the difference in tone is not that audible at all. Well. Perhaps some other type of opamp could behave differently with higher Vcc, but i doubt it.

      In other words, your behaviour is expected. And a feature of basic opamp. But. There is a certain "mojo" to pump the voltage. IMO, you should try to flip the pedal for big bucks and use the "internal 18V operation" as a selling point. No difference in sound, but notable difference in actual selling price :)
      +m

      Delete
  14. Giuliano M.23 August 2017 at 15:24

    which one can be used with a tonebender mkii npn?

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  15. Super Plushy Bros Inc.6 January 2018 at 02:40

    Aren't 1n5817 diodes only rated as 20 volts? So, shouldn't the 25volt and 33volt charge pumps use something rated for 25, 33, or higher?

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  16. Super Plushy Bros Inc.6 January 2018 at 02:43

    So, something like the 1N5818 Diode Schottky 30 Volt, or 1N5822 Diode Schottky 40 Volt?

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  17. Super Plushy Bros Inc.6 January 2018 at 02:45

    Ohh, or the 1n4001 which is 50 volts?

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  18. Dr. Gori6 January 2018 at 15:20

    This comment has been removed by the author.

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  19. Willy16 February 2019 at 09:14

    Correct me if I'm wrong, but I should be able to sub an LT1054 for higher ma capacity, yeah? The pinout is the same...

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    1. Sensei Tim8 November 2021 at 16:06

      if you use a 1054 you need to cut the trace between pins 1 and 8.

      Delete
    2. guest25 February 2022 at 14:32

      cut between pins 1 and 8, and connect the 9V to Pin 8

      Delete
  20. Anonymous22 May 2019 at 22:03

    Would it be possible to make this output 16v instead?

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    Replies
    1. mirosol23 May 2019 at 17:28

      Use 1N400x diodes. Those have bigger voltage drop.
      +m

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    2. Ryan Ford8 June 2019 at 01:19

      had some 1N4001 laying around, brought it down to 16.5v - worked perfectly. cheers +m

      - ryan

      Delete
  21. ctznsmith8 November 2021 at 15:23

    Hi, I've built the 17v version of this but it has a high pitched whine.

    Any ideas on how to remove it, or why it's there?

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    Replies
    1. Sensei Tim8 November 2021 at 16:05

      it's because you're not using the correct charge pump. you need to use the SCPA version of the 7660. the S in the part number is important.

      Also, get your charge pumps from reliable resellers. Tayda charge pumps are hit or miss.

      Delete

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