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Wednesday, 13 February 2013

NE555 Voltage Inverter

Here's a cheaper-to-build alternative for MAX1044/ICL7660 voltage inverter charge pump. According to the documentation, this puppy is capable of 30mA of output current, so it'll be enough for any stompbox use. Circuit isn't as small, as using NE555 timer chip will need couple of resistors and caps to get the job done. Still, simple and small enough. This one is for you guys wanting to get your PNP germanium fuzzes daisy chainable. (and i copied part of the text from the doubler post :))



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25 comments:

  1. Mike13 February 2013 at 21:58

    argggghh! wish I saw this before I ordered those max chips!

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    Replies
    1. mirosol13 February 2013 at 22:01

      I drew this today and posted it couple of hours ago :) But don't worry. You can always stock up on both :)
      +m

      Delete
    2. Rubinski!22 February 2013 at 13:57

      Hi Mirosol,

      Is this one verified? Can I use the NE555N instead of the NE555?


      Grtz

      R

      Delete
    3. mirosol22 February 2013 at 15:18

      I'm not aware if someone built this... So no.

      That's the same chip, so it's ok.
      +m

      Delete
  2. Unknown13 February 2013 at 22:05

    Yeah, I ordered 7660S today :P

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  3. Mike13 February 2013 at 22:25

    Thanks miro! This is a HUGE help. Nothin' like savin' money!

    ReplyDelete
  4. Sanansaattaja14 February 2013 at 14:30

    Oh yes, a quick calculation of components + verobrd less than 0,50$.. Nice :)

    ReplyDelete
  5. Daniel1 April 2013 at 22:12

    is it possible to use it as a bipolar supply?
    I mean using the second row as a +9 output.

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    Replies
    1. mirosol1 April 2013 at 22:20

      Yes. That's the way many would want to use inverters.. Just take +9V to circuit from row 2.
      +m

      Delete
    2. Daniel2 April 2013 at 13:49

      I'll try it as soon as I can...
      thanks for the help as usual!

      Delete
    3. Unknown18 April 2013 at 15:49

      finally I've found some spare time to make this,
      It's working like a charm!
      thank you so much for this, now i'm curious to implement it in a anderton eq, I've noticed that the oscillator was set to a really high frequency, so I keep big hopes about the absence of noise :D
      tested with a 5.20v supply, output is +5.20 -4.90. great!

      Delete
    4. Unknown18 April 2013 at 15:57

      after a while the voltage stabilized to circa 1.5v less than the +ve output... I suggest to use a higher voltage (max 16v I think) and a regulator after this circuit

      Delete
  6. Unknown8 April 2013 at 07:47

    Made this and boxed it with a Sunface Ge and works great - voltage was a little low 7.5-8v but that's fine with the Sunface.

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    1. mirosol8 April 2013 at 09:39

      What was you input voltage?

      I've been waiting to get this one tagged..
      +m

      Delete
  7. snz72816 April 2013 at 03:12

    I too built this with the Sunface GE and am putting in 9.56 volts and it sends out -7.06 volts to the fuzz. I just tested this because you asked otherwise it sounds good.

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    Replies
    1. mirosol16 April 2013 at 08:48

      Could be a feature. Most fuzzes should be fine with -7 to -8 volts, but this probably won't be perfect solution for other applications.
      +m

      Delete
  8. George Camann5 December 2013 at 14:09

    Do you know what frequency this is set to run at?

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    Replies
    1. mirosol5 December 2013 at 17:08

      Around 20kHz.
      http://www.circuitsonline.net/schakelingen/139/voedingen/negatieve-spanning-met-ne555.html
      +m

      Delete
  9. boratto19 March 2014 at 14:13

    About the offboard wiring, must we assume just to invert the led position?

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    1. Unknown25 March 2014 at 15:26

      +1 on this question... But refering to the input/output jacks grounding. Should I use a specific side of the ground ... or ground is "ground" no matter what?

      Delete
  10. Sebastian Mann Andersson18 May 2014 at 17:33

    Hi guys! Does anybody know if I could use this component instead of the ne555? Thank you in advance!
    http://www.mammothelectronics.com/LMC555CN-CMOS-Timer-p/400-1080.htm

    ReplyDelete
  11. Njokki11 June 2014 at 17:55

    Hi Sebastian, i found this in the web:
    "Use a standard (bipolar) NE555 timer - not a CMOS type. CMOS timers do not have the switching abilities of the bipolar types, and output voltage will be lower."

    http://sound.westhost.com/project95.htm

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  12. JimSalabim17 February 2017 at 11:59

    Works fine on my positive ground Parapedal!

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  13. /Christian31 October 2018 at 22:41

    I built this but getting -3.9V - any ideas?
    Thanks!

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    Replies
    1. kg15 March 2023 at 10:08

      My quick guess is that you used 1N400X instead of Schottky diodes. Schottky diodes have a lower forward voltage drop which means that you will lose less voltage along the way.

      Delete