It would help if you'd describe the expected operation of the auger.
I HAVE USED THE WHITFIELD BOARD FROM THEIR CASCADE MODEL FOR RETRO FITTING STOVES NO LONGER BEING MADE. ON LOW SETTING THE AUGER IS ON 1.9 AND OFF 4.2 SECONDS HI 1.9 ON AND 2.O OFF. THE TIMER CAN BE TRIMMED WITH A POTENTIOMETER / VARIABLE RESISTOR OR SOME TURNEY THINGIE. TO THE FOLLOWING PARAMETERS LOW=1.6-4.5 ON HIGH=1.6-4.5 ON ALSO kEEPING IN MIND THE OFF TIMES ARE DIFFERENT BETWEEN HI AND LO. JUST GOT THIS INF OUT OF ONE OF THEIR MANUALS.
MANY OLDER STOVES USE THE 556 DUAL 555 CHIP. I HAVE JUST ORDERED ANOTHER WHITFIELD CASCADE CARD AND WILL LOOK AT THE CHIP WHEN I GET IT AND TRY TO INDENTIFY. I SUSPECT THE NEWER STOVES USE NEWER TECHNOLOGY, BUT FROM WHAT I AM READING THE 555 IS A PRETTY COOL CHIP, CHECK THIS OUT
https://www.electronics-tutorials.com/devices/555.htm THE TIMING IS ONLY PART OF THE PROBLEM AS THERE IS A RELAY CONNECTED TO THE TIMER THAT TRANSFERS LINE VOLTAGE TO THE AUGER MOTOR .5 AMP +/- AND THIS THING CYCLES EVERY 4 SECONDS OR SO. 3600X24=86400 DEVIDED BY 4= 21,600 TIMES THE RELAY CONTACTS IN A 24HR BURN ON HI. CAN YOU EVEN IMAGINE THE DUTY CYCLE OF THESE COMPONENTS? AN ATC 422 REPEAT CYCLE TIMER WITH INTEGRATED RELAY IS AVAILABLE , WOULD WORK BUT NO DUTY CYCLE, TRASH IN A COUPLE MONTHS. I HAVE A GLO KING USING A 556 THAT HAS RUN FOR 15 YEARS ON THE SAME CARD EXCEPT I HAD TO REPLACE THE START BUTTON. FROM WHAT i AM READING THE 555 NEEDS A CAPACITOR AND SOME OTHER GOODIES WIRED INTO THE LOOP TO MAKE IT FIRE, DIFFERENT GOODIES DIFFERENT FIRING TIMES AND DUTY CYCLES DEPENDING ON HOW IT IS PLUMBED SEE THE WEB SITE ABOVE.
THIS IS PRETTY AMBITOUS PROJECT I AM SEEING NOW AND NOT NECESSARY TO DO PERIOD, BUT A CHALLANGE AND MIGHT BE FUN. i CAN BUY CARDS ALL DAY FOR 160 BUCKS, DON'T MAKE A LIVING DOING THIS, JUST PLAY.
jb
- and you said varying off times. What is the range of "off" times and how do they relate to the "on" times? The next question - what is it that will cause the on or off times to vary? Is it a varying voltage from a temperature sensor - manual input from the user via a potentiometer?