TWO-TONE SIGNAL GENERATOR FOR CHECKING RADIO AMPLIFIER CIRCUIT KIT FA903 Uses for maintaining and checking radio or amplifier. This circuit has 2 levels adjustment which are 500 Hz and 1,000 Hz frequency. Signal power is 2,600 mV. maximum, 1 mA voltage consumption and requires 3V. Recommended housing : FB03 PCB dimensions : 1.6 X 1.6