Intelligent battery charger (CB7130E)

Suggested by Radio Electronics from the 90s, this circuit is suitable for NiCAd batteries with a low battery indicator and a charge indicator.

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Very High Voltage Generator II (CB18585E)
This circuit can be used in physics experiments, in ionization and in several other applications. The...
Programmable active filter (CB24629E)
Through digital control, this circuit activates the input filters that have the frequencies...
Voltage Controlled Oscillator 2 (CB12017E)
This VCO or Voltage Controlled Oscillator uses common components. The circuit generates signals that...