Ambient light indicator (CB21567E)

This circuit uses an LDR as a sensor to trigger an LED indicator at a preset lighting level. The power supply does not have to be symmetrical.

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One Quadrant Logarithmic Converter (CB15070E)
This configuration was found in an American publication from the 90s. Operators admit equivalents just...
TTL Oscillator (CB12678E)
The circuit shown in the figure has basically the same configuration as any TTL oscillator, with...
Tone decoder (CB19927E)
This circuit with the PLL567 serves as a decoder for PWM modulated signals of frequencies up to...