Circuit Project Electronic

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 [...]

This circuit use test waves light receiver signal pulse change LED1. For R1 and C1 be formed control the rate pulse of the circuit. Besides equipment all value in the circuit will give the rate pulse about 600Hz. Other detail see add [...]

This is a project based on the above chips , details of which were sent to me by VU3CRJ. I have designed a PCB for the same but unfortunately I have not tried it out. It is to be used with the Baycom Software for Packet Radio. The software is available at the homepage of [...]