Here is the most stable, smallest, and energy saving FM transmitter. It uses only single transistor oscillator, PN2222A. Other high frequency / low noise transistor like 2N2222A, BFxxx series, BC109B, C, and even well known BC238 could work as well. Key to a well functioning, low consumption circuit is to use a high hFE / […]
This mini LED flashlight is very useful for emergency use. Since it size is small enough to put in your pocket, you can bring it anywhere. This portable LED flashlight is powered by only one AAA battery. To boosting input voltage (1.5V) up to operating voltage of a super high luminosity LEDs -blue, green or […]
This metal detector project is extremely sensitive and capable of detecting very small objects at a depth of at least 8 inches. It uses beat frequency oscillator (BFO) method. User need to do some adjustment to the relative temperature before use it since it is not extremely temperature stable. The oscillators circuit operate at frequency […]
This simple rain detector will give you alert when a rain drop is detected. The buzzer is pulsed about once per second for a very short time, giving it a “dripping water” sound which seems appropriate when the circuit is triggered by rain water. The circuit is basically a handy flasher circuit using ordinary silicon […]
This guide helps you to learn and understanding everything you need to know about the Raspberry Pi computer, its background, purpose, system specs, the software it runs and the amazing things it is capable of. FREE DOWNLOAD Unofficial Raspberry Pi Manual (limited)
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