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12v: Tone Generator

Photo: DTMF Tone Grabber Kit DTMF Tone Grabber Kit
The kit will detect DTMF tones from a telephone line or via an onboard microphone and display them on a 16 character, single line display.
Photo: Ion Generator Negative Ion Generator Negative
Are there some healthful positive benefits caused by being in an environment that contains negative or positive ions? Some reports suggest a wide range of benefits. This generator can be set up to generate either negative or positive ions; the builder's c
5 Useful Telephone System Circuits
0 Comments - in Telephone
Features a telephone ring generators, phone line in-use indicators and an audio interface circuit.
Photo: Low Cost Stereo Encoder / Generator (Kit Version) Low Cost Stereo Encoder / Generator (Kit Version)
Our low cost stereo encoder is the perfect way to transform your radio statio into stereo sound with a low budget.
Photo: Low Cost Stereo Encoder / Generator (Assembled Version) Low Cost Stereo Encoder / Generator (Assembled Version)
Our low cost stereo encoder is the perfect way to transform your radio statio into stereo sound with a low budget.
Photo: Stereo Pre-Amplifier with Tone Control Stereo Pre-Amplifier with Tone Control
This stereo pre-amplifier will allow you to get extra control over your audio.