Newest circuit diagrams
It's well known that many animals are particularly sensitive to high-frequency sounds that humans can't hear. Many commercial pest repellers based on this principle are available, most of them operating in the range of 30 to 50 kHz.
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This alarm is designed to sound its Siren only once. That is - when the alarm is activated - the Siren will sound for a preset length of time. Then it will switch off and remain off. The alarm will not re-activate.
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This circuit features automatic Exit and Entry delays - timed bell cut-off - and system reset. It has provision for normally-open and normally-closed switches - and will suit all of the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape, PIRs and Inertia-Sensors).
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Four shape-controls portable unit. Wide variety of output waveforms
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A tone control circuit made with a single op-amp and having three ranges, bass, middle and treble controls.
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LF353 Wide Bandwidth Dual JFET Input Operational Amplifier
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In this circuit the 555 timer is used in a novel way, as a voltage controlled switch.
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This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can immobilize the bike, flash the lights etc.
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Stand-alone, 9V battery powered unit. High overload margin, low distortion circuit
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Very simple, versatile modular design. No limits to the number of modules used in the ring
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