This sequential circuit appears in other versions on this site. This is from American documentation from the 1960s. The speed of the effect is set to R1.
This circuit was found in a 90s Popular Electronics. The sensors can be common speakers that reach...
This variable oscillator with crystal was found in a Popular Electronics of the 90s. The circuit uses...
This sensor circuit was found in an American 1980s documentation. Modern operational amplifiers can...