Simple, low component count tone generator. It can be adapted to create a morse code circuit, by adding a switch to the o… | Circuit, Generator, Electronics circuit
Tone Generator TG4C Model TG4C - Tone Generator | Bogen
Amazon.com: Extech 40180 Tone Generator and Amplifier Probe Circuit Finder Kit : Everything Else
Tone Generator TG4C Model TG4C - Tone Generator | Bogen