Visual metronome (CB21062E)

Based on the well-known LM3909, this LED pulser circuit was found in American documentation from the 90's. The power supply is only 1.5 V.

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Complex Sound Generator (CB21237E)
Using LM3909 integrated circuits, this circuit was found in an American documentation from the...
Full cup detector (CB6956E)
This circuit was found in Popular Electronics. Its purpose is to warn the visually impaired when a glass...
High speed sample and hold (CB8879E)
Found in a 70’s documentation, this circuit can operate with signals up to 10 MHz. The operational...