RE: SV: SSRs, relays, speed controls

["Steve Tyng" <stevet-at-stcharlesmd.com>]

Joe,

I think you need to bite the bullet and just build a full mosfet based dual h-bridge 
controller.  Forget about these reversing relays and over priced SSR's.  All you 
need is a bunch of n-channel mosfets (which I have) and a quad mosfet driver like 
the Maxim621 (http://pdfserv.maxim-ic.com/en/ds/MAX620-MAX621.pdf).

Steve



> -----Original Message-----
> From: tanks-at-rctankcombat.com [mailto:tanks-at-rctankcombat.com]
> Sent: Thursday, March 04, 2004 11:19 AM
> To: tanks-at-rctankcombat.com
> Cc: stevet-at-stcharlesmd.com
> Subject: Re: SV: SSRs, relays, speed controls
>
>
> Woops, my mistake.  Takes 8 SSRs since they're spst
> instead of spdt...
>
> --- Original Message ---
> From: "flier" <FLIER-at-sbcglobal.net>
> To: <tanks-at-rctankcombat.com>, <tanks-at-rctankcombat.com>
> Subject: Re: SV: SSRs, relays, speed controls
>
> >Yep, Bob Blick's code runs at ~20mhz and generates
> >the PWM outputs inline instead of using the PWM
> >modules in the PIC.  That setup requires 4 SSRs.
> >That would still be over $200 wholesale to implement
> >when dealing with high currents.  I'm sure it works
> >good though.
> >
> >Someone just needs to find us a source of free high-
> >current solid state relays...
> >
> >
> >
> >
> >--- Original Message ---
> >From: "flier" <FLIER-at-sbcglobal.net>
> >To: <tanks-at-rctankcombat.com>,
> <tanks-at-rctankcombat.com>
> >Subject: Re: SV: SSRs, relays, speed controls
> >
> >>Hi Bjorn,
> >>
> >>I ran across this the other day.  The interesting
> >>thing is I don't think Bob's code even uses the PWM
> >>modules of the '876.  I think it's done with inline
> >>code and timed loops but I haven't had a chance to
> >>look it over good.
> >>
> >>Thanks,
> >>
> >>Ted
> >>
> >>
> >>--- Original Message ---
> >>From: =?iso-8859-1?Q?Bj=F6rn_Wallentinus?=
> >><bjorn.wallentinus-at-abc.se>
> >>To: <tanks-at-rctankcombat.com>
> >>Subject: SV: SSRs, relays, speed controls
> >>
> >>>Don't know if this will help you but there is code
> >>for the 876 on this pa=
> >>>ge
> >>>http://www.bobblick.com/techref/projects/sv2hb/sv2h
> b
>
>
>
>
>
>