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 configuration of the 1980s uses NAND A-type CMOS ports, which have a linear response with...
This circuit from Delta Products was published in the May 1974 Radio Electronics magazine. The...
This encrypted key was found in a 1989 documentation. It controls a relay that is activated only...