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 circuit applies to almost any common operational amplifier or...
Using the LT128 and LT1037 from Linear Technology this circuit has a 400 MHz gain x bandwidth...
This circuit, found in a publication of the year 1968, uses a transformer to drive two power...