Ultrasonic: Wind Speed Meter

Using ultrasonic techniques, this solid-state design has no moving parts.

This temperature meter uses a Harris 7106 IC as the heart of a low cost, accurate temperature meter. LCD 3-1/2 digit readout. All of the active circuits are in this one, versatile chip. In addition to temperature functions, the board includes an area for

This LCD panel meter is a very flexible design that can be customized to your own VOLT meter or AMP meter needs. It may be customized to measure any voltage range, standard or not. Or you can customize it to measure input from a transducer; full details a

Schematic for an electronic audio level VU meter that uses LED's to display the volume/audio levels.

This kit allows you to control the speed of an AC motor. It can provide high torque at even low speeds.

This is a RC car project is the transmitter and receiver modules for a Remote Control car, with speed control and continuous steering.

This LCD panel meter is a very flexible design that can be customized to your own VOLT meter or AMP meter needs. It may be customized to measure any voltage range, standard or not. Or you can customize it to measure input from a transducer; full details a

Vary the speed of your DC motor with this inexpensive circuit. Gear boxes can be costly and series resistors may cause stalling. This circuit delivers the voltage to the motor with pulses and the speed is controlled via pulse width modulation (PWM). The s

The circuit reproduces the ultrasonic noise that a male produces, this in turn repels the female mosquitoes.

The circuit uses a matched pair of 40 Khz transducer elements to detect movement up to 22 feet away. You may add a relay (not included) to switch higher voltage loads. The unit switches a LED for movement indication. Sensitivity is setable via control. Cr