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.
Using a 741 op amp with symmetrical source, this circuit was found in a 1982 documentation. The...
We found this circuit in a Popular Electronics of the 90s. The circuit can also be used as a seat...
This circuit was found in a Popular Electronics from the 90's. The circuit has gained 10 to 20 dB...