Plant soil heater (CB7964E)

This circuit was found in a 90’s 303 Circuits. The components are from the period and the heating system depends on the resistive element.

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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...