Phonographic preamplifier (CB8249E)

This circuit was found in a Electronics World of 1968. The integrated circuit is the MC1320P from Motorola, uncommon today.

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Audio expander (CB8507E)
Based on the Philips TDA3810N, this circuit was found in an 90s Electronics Now. The circuit has two...
Sound intensity indicator (CB23649E)
This simple circuit does not use active components and uses a small speaker as a microphone. The...
Car Power Amplifier (CB17259E)
This power amplifier configuration can be used in a public address system (ads) in the car. The...