Siren 4046 (CB25764E)

This circuit with the PLL4046 was found in the October 1994 Electronics Now magazine. The transistor is low power, and the volume obtained is small.

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Humidity Alarm (CB13746E)
The sensors of this liquid alarm are formed by two pieces of wire with the ends peeled off. The...
Mixer with the LM3900 (CB14219E)
The three-input audio mixer or mixer shown in the figure was suggested by the Linear Applications Handbook...
Clapp Oscillator (CB25647E)
In the figure we have a classic Clapp oscillator configuration for a frequency of a few tens of...