Product detector (CB9684E)

Found in Motorola documentation from the 1980s, this circuit employs an integrated device from that time, which is unusual today.

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Precision Sample and Hold (CB11544E)
This circuit was found in Linear Circuits Applications of Texas Instruments, originally using the...
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This circuit, from a 1988 publication, consists of a timer that activates a relay at the end of a...
Phototransistor Optical Ttrigger (CB14648E)
This configuration was found in the Texas Instruments optoelectronics manual. PNP transistors...