With this circuit it is possible to vary the resistance by adjusting the mark/space reaction of the 555. The circuit was found in the November 1989 Radio Electronics magazine.
This circuit is from European documentation from the 1980s. The circuit consists of an R-S...
Found in the documentation on PCs, this circuit excites LEDs whose current is determined by R3....
This simple SCR relaxation oscillator was indicated by a 90s Popular Electronics. The frequency is...