We found this configuration in a 1990 Poptronics. The circuit can be powered by voltages between 6 and 15 V, changing the resistors in series with the LED. The frequency is set at R7.
This old circuit, from the 80s, was found in American documentation. The circuit uses dual gate...
The value of R1 given by I = R1 / 5 determines the load current of this circuit. The maximum...
This circuit, found in a 1994 documentation, eliminates the hiss (static noise) that occurs when...