Circuit Lake

This Infrared remote control for Nikon cameras built based on AVR ATtiny13V. The circuit is very simple. It consists of Atmel tiny13V, a button, transistor, resistor, IR diode and 3V battery. If you want simpler circuit, you can connect the IR diode directly to the ATtiny13V, but that will limit the LED current and therefore the range.The project is compatible with the Nikon ML-L3 remote control. Supported cameras including D40, D40X, D50, D60, D70, D70s, D80, and Coolpix 8400 8800.Camera Remote Project Firmware, Schematic and Documentation xs4all.nl

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 / low Ceb (internal junction capacity) transistor. FM Frequency is determined by a parallel LC resonance circuit and shifts very slow as battery drains out. Its max range about 30 meters max at 1.5 Volts.Main advantage ...

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 white- (3.5V), it uses simple DC to DC converter."The circuit is a typical blocking oscillator. High voltage pulse appears at collector of the Q1 (low voltage strobe transistor) is rectified by D1 and charged into ...

If you want to build an ultrasonic range finders project but you don't want spend much money to buy commercial sensors like Parallax’s PING sensor then Kerry D. Wong's project may help you to build sensitive ultrasonic range sensor using inexpensive ultrasonic transducer. It takes cost less than 5 dollars (excluding the MCU).The project uses cheap 24 kHz transducers. These sensors can easily achieve a range of more than 20 feet with properly designed circuits. The ultrasonic transmitter is powered from ATmega328's counter 1 PWM output (chip pin 16 and ...