Audio expander (CB8507E)

Based on the Philips TDA3810N, this circuit was found in an 90s Electronics Now. The circuit has two channels including the voltage regulator stage.

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3.3 V Switched Regulator (CB21164E)
Found in a Linear Technology documentation from the 90s, this circuit dissipates 1.5 W with an...
Phase shift oscillator (CB21668E)
This phase shift oscillator generates sinusoidal signals in the audio range. Frequency depends on...
Combined Light and Dark Alarm 741 (CB25480E)
This circuit detects a light window using two operating systems. The circuit is from a July 1992...