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From: Winfield Hill
Subject: Re: zero-power toggle circuit; was, how to master electronics
Date: 22 Nov 2002 06:39:18 -0800
Organization: Rowland Institute
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Tony Williams wrote...
> PS; There is a comp I'd like to add. A small diode,
> pointing upwards from the top of C1 to Vcc. This is
> to help protect the gate of TG1 (from the energy in C1)
> during a fast power down.
You mean TG2, right? Why not use the switch directly and
eliminate TG2 entirely? Now two free TGs are available.
I'm looking at the TG3 + 10k MOSFET driver, wishing that it
provided robust drive for both HIGH and LOW. I'm looking at
the two unused TGs; they could create a MOSFET driver. TG3
can serve new duty as an inverter for one of the output TGs.
Now I'm thinking about insuring a latency between one driver
TG going off and the other turning on. Perhaps two series
resistors can replace the TG1 toggle flop's 10k to assist in
the task of creating nested pulses for the two driver TGs.
Ah, yes, the FET's gate capacitance will nicely hold its
state during the short time both TGs are off. Looking good.
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