This very low power circuit is based on the ICL7860. We found it in an Electronics Now from April 1995. The output current is very low.
The circuit was found in the February 1992 Radio Electronics magazine. The scale can be changed by...
Taiyo Yudem SAW filters can be ordered from Mouser Electronics for UMST (W-DMA), GSM, CDMA, LTE,...
This circuit was found in 1980s Electronic Engineering. Transistors can be modern equivalents. The...