Tone generator circuit & probe for cars

How to Build Bird Sound Effects Generator.

One of the biggest problems you find often with networks in large office complexes is that your signal fails in one or more of the network cables.
A simple alarm circuit with diagram and schematic that generates multi tone sound. This alarm circuit is suitable to use in burglar alarms and sirens and is designed
Askville Question: How do I use a tone generator to locate a short circuit in an electrical circuit? : Consumer Electronics
This is a basic 555 squarewave oscillator used to produce a 1 Khz tone from an 8 ohm speaker.
A dual tone model train horn/sound generator/simulator circuit can be made using two NE 555 timers connected in cascade. But here circuit diagram is designed with NE

Birds have always intrigued us by their sweet and pleasing twitting sounds. Though it may be difficult for us to imitate them, could be definitely done through
Non-contact probe audibly identifies selected wire or cable; Trace phone, computer network and coax cables; Tone generator is terminated with RJ11 and RJ45 connectors

Cable Tracer | Tone Generator And Circuit.

555 Tone Generator (8 ohm speaker) |.
Simple Alarm Circuit with Diagram-Multi.
Dual Tone Model Train Horn/Sound.
How do I use a tone generator to locate a.