At least opamps give you a wider choice of supply voltage and an opportunity
to interface directly with higher supply voltage circuits like automotive
and alarm systems.

Anyway here is the Quadrature Opamp walker with phototropic and reverser
subsystems, the latter using some 74AC240 inverters (which limits the supply
choice) Four of the remaining 74AC240 inverters could be used as motor
drivers for the 6V Servo motors. The motors are driven with position
feedback so sync reversing is not needed.

All as yet untested but will probably work fine.

wilf

----- Original Message -----
From: "Bruce Robinson" <Bruce_Robinson@...>
To: <beam@yahoogroups.com>
Sent: Friday, July 25, 2003 8:16 AM
Subject: Re: Not So Dummy Opamp Walker was Re: [beam] Re: Reversing
Gracefully


> Wilf Rigter wrote:
> >
> > ... This walker maintains correct timing over a
> > wide range of supply voltage (3V-32V) because
> > of the ratiometric comparator action of the
> > "core". How about a 24V walker?
>
> You know, I'm beginning to suspect that the real future of op-amps in
> BEAM is that it will allow us to operate higher voltage motors without
> having to have a separate power supply.
>
> Bruce



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