Absolute Value Comparator (CB21598E)

Based on common operational amplifiers, this circuit was found in Texas Instruments documentation. The power supply must be symmetrical.

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Low Pass Second Order Filter 741 (CB25818E)
This unity gain circuit was found in the February 1995 Electronics Now magazine. The frequency is 10 kHz,...
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Simple pulse extender (CB8921E)
This TTL pulse stretcher or stretcher was found in a 90's EDN. The time constant R x C1 determines...