The circuit shown is from National Semiconductor's Linear Applications Handbook. It makes use of the LM78S40 which is not an easy component to obtain today.
Using red LEDs with ignition voltages of the order of 1.5 V we can make a multiple voltage...
a This circuit was obtained from a 1978 Practical Wireless. It causes a low-power 1.5V lamp to...
The circuit presented was taken from an old English publication in 1981, but it can be easily...