This circuit was found in a National Semiconductor manual from the 1980s. The integrated circuits used are equivalent. Note the need for a symmetrical power supply.
Based on Texas Instruments documentation, this circuit is based on the BQ2000 a circuit used to...
The circuit shown was found in a Japan publication from the 1960s. The transistors can be of any...
This circuit is from a 1977 documentation. It is powered by the power supply of the circuit under...