This power supply was featured in the December 1973 issue of Radio Electronics magazine. This type of circuit was used at the time to power tube televisions.
In the figure we have the way to use a TTL 7413 port as a low frequency oscillator making an LED...
The idea of this circuit is to use a computer UPS to supply an emergency light when power is lost....
The circuit in the figure is suggested by ST Microelectronics (www.st.com) and consists of a...