This circuit uses components that are still common despite being from 1995 documentation. The circuit can be powered by 6 to 12 V voltages and the speed of the LEDs' sliding effect is set to P1.
This circuit with only one tuned coil was found in a 1980s American documentation. The circuit uses...
This high gain circuit is from 1969 General Electric documentation. The transistors are of the...
I found this circuit in an English magazine from July 1982. The circuit is still viable because all...