Rumble filter (CB6541E)

This turntable filter was found on an 80's Elektor. The circuit makes use of operational features that are easily obtainable today.

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Narrow Range VCO 4046 II (CB19079E)
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
Luminous Power Flasher (CB20339E)
This old circuit is suitable for signaling applications. The lamp must be incandescent, and the...
Half Wave Operational Rectifier (CB17023E)
In the figure we show how the half wave rectification of a signal can be done using an operational...