Motorola suggests this circuit in an 80's documentation. The circuit uses an inverter to produce a higher voltage for 9 V battery charge from a single cell.
We found this circuit in the Linear Applications Handbook of the 1994 National Semiconductor. The...
The 4028 CMOS IC not only contains the complete decade counter, but also the 7-segment decoder...
This circuit was found in a 1968’s General Electric documentation. The circuit uses components from...