Found in a Popular Electronics from the 90's, this circuit is used to recognize the frequency of a modulated infrared signal. The LM567 circuit must not be supplied with voltages above 9 V.
November 2016 - Mouser Electronics already has Maxim's MAX17245 DC-DC step-down converters to...
This variable frequency oscillator with the 4093 was found in a Popular Electronics from the 90s....
This circuit was found in an old Philips publication. The circuit supplies a voltage corresponding to 4.5 V...