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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I am trying to wire the tl494 so that zero control voltage=zero duty cycle (and increasing the voltage increases the d.c. linearily). So far any combination I have tried results in zero control voltage=maximum duty cycle. Any ideas how to wire it up?
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Is there any reason you can't use the internal comparators instead? Otherwise I would use a differential amplifier to make an inverter of sorts, so 0-1.2V on the input gives 1.2-0V on the output.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Uhzsaurs wrote ...
Is there any reason you can't use the internal comparators instead? Otherwise I would use a differential amplifier to make an inverter of sorts, so 0-1.2V on the input gives 1.2-0V on the output.
Ok, so let's say I am an op-amp n00b How would I go around making an "inverter" with the internal comparators? I wonder if there would be any problems with the diodes on their outputs.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
It would be harder with the internal comparators, but they could be used to manipulate the duty cycle directly instead. Like shown here . You might have to short pin 1 and 3 instead to get what you want, and feed the pot to pin 2. (making it an inverting amplifier)
If you used an external op-amp: wire it like a differential amplifier with 1.2V on the positive input and 0-1.2V on the negative input, and feed the output to pin 4.
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TL494 duty cycle
How would I go around making an "inverter" with the internal comparators? I wonder if there would be any problems with the diodes on their outputs.
