Recording and playback circuit with ISD1000A (CB7441E)

Found in an Electronics Now from the 90s, this application uses an integrated circuit from the hard times to find today.

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Speaker protection (CB8193E)
Found in a 90s Silicon Chip documentation this circuit is intended to protect a speaker system in...
10V Negative Voltage Reference LT031 (CB14596E)
The circuit shown is a reference of -10 V with a maximum current of 50 mA obtained from the Linear...
Alarm with lock (CB8964E)
Found in a 1980s American documentation, this circuit can use a SCR and a general-purpose transistor....