Voice Activated Switch (CB5982E)

This 80's documentation circuit includes an amplifier of the era. Used integrated circuits are uncommon today but can be used equivalents.

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Dial Tone Generator (CB5984E)
This circuit is from an old documentation making use of a 3,579,645 MHz analog color television...
Light Relay with LDR (CB4952E)
This 741 operational circuit can be found with slight variations in this section and on this site....
Solar power source (CB20481E)
In the figure we have a solar power source for experiments with this type of energy. The cells must...