This circuit generates sinusoidal signals that depend on the input oscillator. The circuit is from a Radio Elecrtronics from April 1988. The signals are in the range of a few hundred kilohertz.
This digitally programmed gain amplifier was obtained from Signetics documentation from the 1980s....
This circuit is from a 60's documentation. The capacitance C1 can be between 20 pF and 0.01 uF...
This circuit was obtained from an American 1980s documentation. The frequency depends on the...