Homebrew PCBs

> In the simple controller suggested 

A blast from the past....Is the obsolete Allegro UCN5804 unipolar 
driver that difficult to get these days? I found 3 in my parts box and 
4 installed in boards here, using anything other than that for a simple 
unipolar driver is a waste of time IMO.

http://www.allegromicro.com/datafile/archive/5804.pdf


--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan" 
<stefan_trethan@g...> wrote:
> On Tue, 21 Jun 2005 05:36:54 +0200, Phil <phil1960us@y...> wrote:
> 
> > why do most hbridges and stepper controllers use schottkys?
> 
> 
> because they are faster. all switchmode/pwm circuits use faster 
diodes.
> In the simple controller suggested there is no chopping, the 
frequency is  
> low, a 1n400x could be ok.
> 
> ST