5V Powwr Supply Crowbar protection MC3425 (CB14530E)

This circuit is suggested by Motorola in its 1990 Linear Databook. The integrated circuit is no longer common in the market.

Modulated Siren CMOS 4046 (CB19087E)
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
Two-Tone Siren LM3909 (CB21236E)
This circuit was obtained from an American documentation from the 90's. The components can be...
Music Box or Musical Bell (CB18703E)
We found this simple music box circuit that can also be used in a musical bell in a 1991...