Security switch (CB8514E)

This shield circuit was suggested by a 90s Popular Electronics. The circuit can use either a triac for a common load or a mechanical relay.

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Sine and Cosine Oscillator with the 741 IC (CB9513E)
This circuit generates sinusoidal and cosine signals of 2 kHz given basically by the values of C1...
Sound of Phasor 4046 (CB25766E)
Using a 4046 PLL, which is not very common nowadays, this circuit was found in the October 1994...
CMOS Logic Switch (CB1276E)
This configuration was found in a 1970s American magazine. The circuit uses both CMOS logic and...