We found this circuit in a 90s Radio Electronics. The circuit generates frequency-modulated 220 kHz signals. The components used are still common.
It can be obtained from Mouser Electronics the new LM290xAQ operational amplifiers from Diodes...
Applying an operational of the time, this circuit of an old documentation can be elaborated with modern...
June 2017 - The new touch screens with resistive sensors of the FK Series from NKK Switches can...