three-level touch control (CB7040E)

Found in Popular Electronics this circuit uses common components to control an incandescent lamp with three levels of intensity

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Positive only switch (CB6924E)
This circuit was found in a 1965 Electronic Design. What it does is respond only to positive...
Ralaxation Oscillator Using the 741 (MSB014E)
This relaxation oscillator, simulated in the Multisim Blue, produces two different signals. The...
VCO (CB11518E)
This VCO or Voltage Controlled Oscillator was found in a Popular Electronics from 1991 but can be...