Intermittent Oscillator or Siren (CB18276E)

The basic siren configuration shown in figure 1 activates a piezoelectric transducer and can be used as an alert or warning device.

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Sine to square converter CA3140 (CB24971E)
Using an operational amplifier, the figure shows how to convert the waveform to low frequency...
10 W Amplifier (CB6158E)
This high quality circuit with complementary symmetry was found in an Electronics World of 1966....
Triangular To Rectangular Converter (CB12080E)
This circuit was obtained in an old 1983 magazine, but it can still be easily assembled. The...