> From: Prashant Bhandary <prashb@RTA.NSW.GOV.AU>
>
> [quote cut]
> I've used the L293D which I got from RS Electronics. It was about AU$18 or
> so for two units. The L293D lacks the protection diodes. One of the 0.6A
> versions comes with protection diodes. One disadvantage of the L293 could
> be the voltage drop. I don't know about the L293 but its bigger brother
> L298 rated at 4A drops about 2-5 volts. I'm using a couple of L298s bought
> from RS at AU$25 each(?). The MOS based H bridges like the LMD18200 probably
> have a much lower voltage drop but are way more pricey.

Places like RS Components and Farnell are convenient, well stocked and
comprehensive.  The down side is that they are between 2x and 5x as
expensive as a more specialised supplier.  Check out the diff between
RS and, say, Zatek for prices on PIC chips in small qty.

The RS catalogue makes an interesting couple of evenings' reading, if
you can get one.  They only send you a catalogue if you are going to
spend over $1000 in a year, but I asked nicely so they sent me an
out-of-date catalogue for free.

Regards,
SJH
Canberra, Australia