Alt-BEAM Archive

Message #02700



To: "'Richard Piotter'" richfile@rconnect.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Tue, 27 Apr 1999 17:13:57 -0700
Subject: [alt-beam] Re: Bicore head targeting?


Hi Richard,

The solution you are proposing is a solid traditional engineering approach
which will work just fine and my only suggestion for that design is forget
about the series diode, just integrate the two bicore outputs and compare
their average DC value which is 2.5V for 50% duty cycle with a window
comparator.

But your design is NOT BEAM (grin).

Here is a BEAM solution which was derived from my PD comparator in the
photovore circuit posted some weeks ago. It provides two LEDs to indicate
turning in the LEFT or RIGHT direction (seeking mode) and blinking LEDs when
the target has been acquired (balanced mode). The potentiometer should be
adjusted for mid position and when the target is acquired, adjusted until
both leds blink at about 2Hz. This is the indication for lock. For small or
slow changes in direction the lock indication continues since the error
signal is small. For faster changes or "unlocked" continuous turning
conditions (mind that you don't strangle you head), the left or right LED
will light indicating the direction of turning. This is just a thought
experiment, I have not build or tested this circuit but I'm sure it will
work as described. So if anyone out there is "quick on the draw" and builds
this circuit tonight, some feedback would be appreciated.


Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411

> -----Original Message-----
> From: Richard Piotter [SMTP:richfile@rconnect.com]
> Sent: Tuesday, April 27, 1999 2:41 PM
> To: beam
> Subject: Re: Bicore head targeting?
>
> PERRRRRRRRRFECT!!!
>
> This is EXACTLY what a switching power supply does. It creates a pulse
> that can have a variable duty cycle. A filter (caps, inductors) filter
> it into DC

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