Operational current source (CB8856E)

We found this circuit in a 70s EDN. The circuit makes use of operational of the time.

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Fire siren (CB21232E)
This circuit that emits siren sound can be used in a fire alarm. We found it in an old American...
Applications for the Microchip CL88020 sequential LED Driver (ART340aE)
Launched in 2017 the Microchip CL88020 is an LED driver optimized for 120 VAC input applications with an...
Direction Indicator for Bike (CB931E)
This circuit was found in Electronics Handbook, Vol XIII 1993 and consists of a simple direction...