Audio and video switch (CB8512E)

This circuit was obtained from a 90s Radio Electronics. The integrated circuit used HAA11508 is not a common component today.

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Square Wave Generator (CB12810E)
This circuit was obtained in an old Argentine publication, using germanium transistors and...
Milliohmmeter (CB25813E)
This very low resistance meter was found in the February 1995 issue of Electronics Now magazine. The...
White noise generator (CB22010E)
Using a CA3130 operational amplifier, this circuit was found in an English publication from 1977....