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.
I found this circuit in a 1986 English magazine. It can still be easily assembled, replacing the...
We found this circuit in a technical documentation on the National Semiconductor LM3909. The...
This circuit is suitable for applications in medical, research and industrial equipment. The...