Analog Data Isolator (CB6523E)

We found this circuit in an 80's Electronic Design. It makes use of couplers of the time that can be replaced with equivalents.

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Third Brake Light (CB4783E)
This circuit was found in a Popular Electronics of the 90s. It operates a third brake light that...
Transmitter for of 15-meter range (CB20400E)
I found this little signaling transmitter in old American documentation. The circuit has a good...
Amplifier for microammeter (CB3927E)
This sensitive amplifier for low current measurement uses a differential amplifier configuration with...