Insect Repellant Circuit diagram
Notes: Repell those repugnent insects from your Garden this Summer with this insect repellant circuit. Designed by Graham Maynard the circuitry consists of a phase locked loop (CMOS 4047) wired as a 22KHz oscillator. The output is amplified by a pair of complimentary output transistors and drives a Motorola 3.25 inch Piezo. Current drain is [...]
Read Full Post | Make a Comment ( None so far )Testing transistors and diodes with an analogue multimeter
Diode test with an analogue multimeter The basic diode test is very simple to perform. Just two tests are needed with the multimeter to ensure that the diode works satisfactorily: Step by step instructions: Set the meter to its ohms range – any range should do, but the middle ohms range if several are available [...]
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