Digital to Analog Converter with uC Watchdog This
is another way i did the same thing.
Better still use a uC with watchdog built in like some atmel
chips, or use the watchdog chips from maxim which can also do
RAM battery management.
Another way i have used a 555 -
High Resistance Meter
The circuit was developed over a old TI application note,
7555 i think fairchild may be making it, 7555 is CMOS version
of 555 timer, advantage of 7555 is that it can go to higher
frequency, low power consumption, the disadvantage is its
output drive mA is not as good as 555. now why i put it here
was that you can see how charge and discharge paths are
separated with diodes.
Images above are from the Original Signetics 555 Datasheet
Back to 555 Circuits
20th Apr 2020
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