KC8AON's QRP PROJECTS PL TONE ENCODER FOR OLDER RIGS
Two Simple CTCSS Encoders
256713A-R Tone Generator & Probe Kit – Hobbes USA
Klein Tools Toner-PRO Tone Generator VDV500-063 - The Home Depot
CTG-1A - Clock Controlled Tone Generator | Viking Electronics, Inc.
Simple Multi-Tone Generator Circuit using Transistors
Tone Generator - Apps on Google Play
Multitone CTCSS Encoder with OLED Display
CircuitWerkes GEN-r8 Programmable DTMF Tone Encoder/Generator - ProAudio.com
Taidacent DTMF Decoder/Encoder Full Form Dial Tone Generator Dual Tone Multi-Frequency Audio Decoding Digital Display: Amazon.com: Industrial & Scientific