Re: Schmitt trigger for feedback SSTCs

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Malcolm Watts <m.j.watts-at-massey.ac.nz> 

On 30 Apr 2004, at 22:12, Tesla list wrote:

 > Original poster: John Keith <jskeith-at-interaccess-dot-com>
 >
 > Hi Greg, all...
 >
 >     You might want to look at the TMS2815 from TI ( www.ti-dot-com ). 4 to
 >     14V
 > operating voltage, 2A peak output current, dual-NAND configuration in
 > an 8-pin package. Kind of like a 4093 with b-at-!!s. More expensive than
 > a 555, about $2.00US, but quite versatile and made for the purpose of
 > driving FETs.
 >
 > Regards,
 > John Keith

An old favourite of mine is the ICL(M?)7667. Two inverting buffers
with Schmitt trigger inputs in an 8 pin DIP designed for peak outputs
of an amp (possibly more, I forget).

Malcolm

 >
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Thursday, April 29, 2004 9:56 AM
 > Subject: Schmitt trigger for feedback SSTCs
 >
 >
 >  > Original poster: Mr Gregory Peters <s371034-at-student.uq.edu.au> > >
 >  Hello all, > > Been looking at common, cheap schmitt triggers used
 >  for feedback SSTCs,
 > and
 >  > have noted that they:
 >  >
 >  > a) generally only run on 5v
 >  >
 >  > b) Can only supply a few tens of mA output
 >  >
 >  >
 >  > Anyway I found this circuit at:
 >  >
 >  > http://www.uoguelph.ca/~antoon/gadgets/555/555.html
 >  >
 >  > Go to the "example circuits" section, figure 9.
 >  >
 >  > It is a 555 timer being used as a schmitt trigger to clean up dirty
 >  wave > inputs. Seems this would be useful to us SSTCers, as it is
 >  cheap, can run > off 12v, and can supply up to 200mA output current.
 >  > > Is there any reason why this couldn't be used in a feedback SSTC
 >  system? > > > Cheers, > > Greg Peters > Department of Earth Sciences,
 >  > University of Queensland, Australia > Phone: 0402 841 677 >
 >  http://www.geocities-dot-com/gregjpeters > >
 >
 >
 >