Burst generator (CB21067E)

Found in American documentation from the 90s, this circuit generates sound bursts according to the digital control.

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MOSFETs bias (CB6962E)
In the figure we have a typical polarization circuit for MOSFETs with a high impedance...
Graphic Equalizer (CB24554E)
This equalizer was found in the May 1978 issue of Radio Electronics magazine. The component values...
Colpitts Harmonic Oscillator (CB9645E)
Found in a 1980s American documentation, this crystal-controlled oscillator generates 100 MHz...