description Heathkit IG-18 Overview
The Heathkit IG-18 is a build-it-yourself sine-square audio generator introduced by the Heath Company in the late 1960s. It produces sine-wave and square-wave test signals across the audio range, with controls for frequency and output level, and was intended for technicians, experimenters, and hobbyists who needed a signal source for checking or troubleshooting audio circuits and equipment.
help Heathkit IG-18 FAQ
What signals can the Heathkit IG-18 generate?
The IG-18 produces sine-wave and square-wave signals in the audio-frequency range. Those two waveforms let a technician test both ordinary frequency response and the behavior of equipment with sharper signal transitions.
How is the IG-18 used to troubleshoot an amplifier?
A technician feeds a known tone from the IG-18 into the amplifier and checks the output for level, distortion, or missing frequencies. Changing the generator's frequency helps reveal problems in the amplifier's audio response.
Is the Heathkit IG-18 an RF signal generator?
No, it is an audio generator intended for testing audio equipment rather than radio-frequency circuits. Its practical targets include amplifiers, preamplifiers, receivers' audio stages, and other low-frequency components.
What should be checked on a vintage IG-18 before use?
Inspect the power cord, switches, capacitors, wiring, and calibration before connecting it to valuable audio equipment. A frequency counter or oscilloscope can help confirm that the output frequency and waveform are still accurate.
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