Re: Schmitt trigger for feedback SSTCs

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

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



----- 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
 >
 >