Need circuit using 7660 intersil i.c. s that extends life of half dead c cells d cells etc appeared in either a popular electronics magazine or radio electronics magazine in the 1970's uses a one farad mylar cap and 3 10uf can caps
anyone have that??? thanks bill

 

Sounds like a boost converter. There are newer, more efficient boost converters today.

 

There are newer, more efficient boost converters today.

The Linear Tech LTC1044 or Maxim MAX1044 would be drop-in replacements. They are 95% to 98% efficient.