Re: Is anybody using NE521 comparators?

On Thu, 26 Sep 2024, Bill Sloman wrote:

On 25/09/2024 11:16 pm, Jean-Pierre Coulon wrote:

If the difference between both inputs is not a least 50 mV the output remain at about 1.5 or 2V instead of beeing close to V+ or ground. What am I doing wrong?

>
Getting it to oscillate faster than your oscilloscope can follow?

Yes this was an oscillation. A bit fast for my scope but visible.
I worked around with a 10 mV hysteresis but it is unpleasant because I want to detect when an about 20 mV high signal goes to zero. I oscillates with a smaller hysteresis.
--
Jean-Pierre Coulon