This circuit with the HA2400 was found in the March 1980 Radio Electronics magazine. The circuit has digital-gain control and must be powered by a symmetrical 15 V source.
The operational amplifier used in this circuit is a low voltage type from Texas Instruments, being...
Found in an English Maplin documentation from 1983, this circuit generates separate frequency...
The presented circuit consists of a double phase shift oscillator capable of generating two sine...