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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Should all layouts be verified before publishing? This would mean less layouts but more peace of mind?
argggghh! wish I saw this before I ordered those max chips!
ReplyDeleteI drew this today and posted it couple of hours ago :) But don't worry. You can always stock up on both :)
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Hi Mirosol,
DeleteIs this one verified? Can I use the NE555N instead of the NE555?
Grtz
R
I'm not aware if someone built this... So no.
DeleteThat's the same chip, so it's ok.
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Yeah, I ordered 7660S today :P
ReplyDeleteThanks miro! This is a HUGE help. Nothin' like savin' money!
ReplyDeleteOh yes, a quick calculation of components + verobrd less than 0,50$.. Nice :)
ReplyDeleteis it possible to use it as a bipolar supply?
ReplyDeleteI mean using the second row as a +9 output.
Yes. That's the way many would want to use inverters.. Just take +9V to circuit from row 2.
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I'll try it as soon as I can...
Deletethanks for the help as usual!
finally I've found some spare time to make this,
DeleteIt'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!
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
DeleteMade 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.
ReplyDeleteWhat was you input voltage?
DeleteI've been waiting to get this one tagged..
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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.
ReplyDeleteCould be a feature. Most fuzzes should be fine with -7 to -8 volts, but this probably won't be perfect solution for other applications.
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