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Bat Detector microphone pre-Amplifiers- The microphone pre-amplifier has the job of amplifying and conditioning the signal coming from the microphone. In case of an electret microphone, the amplifier must have a gain that increases with frequency to compensate for the low sensitivity of the microphone for high frequencies. Also the low frequency part must be filtered out. In case of a piezo transducer, __ Designed by Bertrik Sikken Build a Simple Circuit Bat Detector- The Simple Bat Detector is a frequency division type device. Frequency division type detectors allow you to hear ultrasonic sound by digitally scaling the frequency down into the human hearing range. For instance, a western pipistrelle bat emits ultrasonic sound in the range __ Designed by Tony Messina-Las Vegas, NV
Cockroach Zapper- Using a PIC for this device provides a lot of useful functionality. The timing for the power pulse to the inductor is critical to getting the best Zap from your nine volt battery. The longer the current is on, the higher the voltage. Once the inductor reaches saturation, however, you are just wasting power. __ Designed by Luhan Monat-Mesa Arizona
Deer Repellent- Here is a simple sensor which can detect the seismic vibrations caused by a person or large animal walking nearby. A representative application for the sensor is a deer repellent for the vegetable garden __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Electric Bug Zapper- None of us likes bugs at home. To kill these flying insects, they should first be attracted and then electrocuted. Bug zapper is one such device with a high-voltage electrocuting circuit...__ Electronics Projects for You
Electric cockroach zapper- Using a PIC for this device provides a lot of useful functionality. The timing for the power pulse to the inductor is critical to getting the best Zap from your nine volt battery. The longer the current is on, the higher the voltage. Once the inductor reaches saturation, however, you are just wasting power. __ Designed by Luhan Monat-Mesa Arizona
Electronic Mice Repellent- This electronic mice repellent emit high frequency sound waves to create an acoustically hostile environment that effectively repels rodents from protected areas. Sound is inaudible to people and non-rodent pets. It is ideal for environments were the use of poisons is inadvisable or prohibited. It is known that a mice can hear __ Designed by Popescu Marian
Environmentally-friendly Mosquito Repeller- With the return of the fine weather, you’ll doubtless be enjoying lazing around of an evening on your patio or in your garden, but even if you’re not surrounded by marshes or other shallow water it’s very likely some intruding mosquitoes will come along to spoil this idyllic scene. Although indoors it’s easy to get rid of them these days, indeed even to prevent them coming into the house__ Learning Electronics
Hap Tells His Backyard Varmints to Hit the Road- 6-Nov-06 -Design News: Tired of torn-up flower beds, Hap took matters into his own hands by combining a sprinkler and wireless driveway alert system. To allow enough time for the sprinkler valve to open, build pressure, and activate the sprinkler head, he constructed a time-delay unit from an old standby 555 timer. It __ Gadget Freak-Case #93
Insect Repellant- The idea for this project may have come to me in a flash of inspiration, and it’s a very simple way to check if a fuse has blown without removing it from its holder. __ Designed by Graham Maynard
Mosquito Repellant- Very simple and easy to assemble mosquito repellant using two transistors and handy components. __
Mosquito Repeller- This circuit produces a tone above the human audible range and this is supposed to keep the mosquitoes away. You need a piezo diaphragm that will respond to 15kHz and these are very difficult to find. __ 555-Timer
Mousetrap- All of a sudden there was a mouse under my roof and once also in my room. So I developed this mousetrap to catch them alive, of course. Description with pictures of the trap and the mouse. __ Designed by Herbert Dingfelder
Parasite zapper- This page tells you how to make a Hulda Clark-style "Parasite Zapper". This is a simpler and more efficient version that works just like the original, but the battery lasts much longer. We make no therapeutic claims for this device. It is for experimental purposes only__
Roach Motel-Electronic- Using a PIC for this device provides a lot of useful functionality. The timing for the power pulse to the inductor is critical to getting the best Zap from your nine volt battery. The longer the current is on, the higher the voltage. Once the inductor reaches saturation, however, you are just wasting power. __ Designed by Luhan Monat-Mesa Arizona
Seismic Sensor- My original "Deer Repellent/ Seismic Sensor" recommended using a speaker with a weight glued to the cone as a vibration sensor (see bottom of page) but it recently occurred to me that the speaker could supply the mass itself. By gluing __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Timer for Mosquito Destroyer- In electric-heating mosquito repellents, an electric vaporizer heats up a mat or liquid to release non-degrading chemicals into the air and keep the mosquitoes away from the closed surroundings. Here's a circuit...__ Electronics Projects for You
Ultrasonic Pest Repellent- It is well know that pests like rats, mice etc are repelled by ultrasonic frequency in the range of 30 kHz to 50 kHz. Human beings can’t hear these high-frequency sounds. Unfortunately, all pests do not react at the same ultrasonic frequency. While some pests get repelled at 35 kHz, some others get repelled at 38 to 40 kHz. Thus to increase the effectiveness, . __
Ultrasonic Pest Repellent (radioland)- Rats, mice are repelled by ultrasonic frequency in the range of 30 kHz to 50 kHz__ |
