Found in a 1968 EEE, this circuit accepts frequencies from 1 to 1000 Hz and control voltages from 0.1 to 15 V. The operational amplifier is from the era and can be replaced by modern equivalents.
Found in old documentation, this source uses an integrated circuit from that time, which is...
This circuit is from old documentation but can be applied to modern equivalent components. The...
This circuit was obtained from an 80's documentation from General Electric. The circuit uses an...