Crystal Pierce Oscillator (CB6149E)

This circuit uses a 100 kHz crystal, but nearby frequencies can be obtained with appropriate crystals. Components are still common today.

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