The circuit shown was obtained in American documentation from 1968. MOSFETs can be replaced by equivalents. The circuit dissipation is less than 0.5 mW.
Found in a 1968 EEE, this circuit accepts frequencies from 1 to 1000 Hz and control voltages from 0.1 to...
This circuit has appeared several times on this site in different applications. This is from 1997...
This setting appears other times in this section from other sources. This is from an 80's American...