PUT LED blinker

The next circuit is a LED blinker that is based on the PUT symmetrical square wave generator.
The LED will blink on and off approximately every second when the power supply voltage is about +12V.
With higher power supplies, the LED will blink faster because the charge current for C1 will be higher when the power supply is higher.
With lower power supplies, the LED will blink slower, because the charge current of C1 will be lowered when the power supply is lower.
The value of R2 in the circuit was chosen for a power supply voltage of about +12V DC.
Increase R2 when higher power supply voltage are used, so the current through the LED is about 15 mA for high efficiency LEDs.

The reverse circuit, with exact the same behavior, looks like this :