Lightning Detector
The following circuit is an improved version of my original
Lightning Detector designed to run on a 5 volt supply. The new
circuit features a superior RF section with a single resonance near
300kHz and plenty of sensitivity...
Here's a circuit from the datasheet for the National Semiconductor LMC6001 ultra low input current amplifier. Scroll down to page 10 for a complete description of the circuit and the calibration procedures...
16-bit A/D Converter w/ RS232 Interface
A PC usually requires a plug-in ADC card to process analog signals.
However, with this circuitry a PC can communicate with an 18-bit
ADC through its serial port...
Wireless Weather Monitoring Station
The Wireless Weather Station is composed of a remote station and a
base station. The remote station is solar-powered and wakes
up...
Isolated, 12bit, 8 Channel, A/D Converter with PC Interface and
0.1% Accuracy
This circuit uses the parallel port on the PC to interface to a
MAX147 12bit, 8 channel A/D converter. By using the National
LM4040AIM-4.1 reference, an accuracy of 0.1% is obtained...
The Inductance Meter Adapter described in this article is a circuit that, when connected to a digital multimeter, lets you measure low-value inductances. This circuit from Poptronix is a low cost device that provides approximate Inductance measurements. And, since it's from Poptronix, a circuit board layout is included...
Time Domain Reflectometer
This circuit is from Tomi Engdahl's page. It describes a nifty
little TDR that, when combined with a regular oscilloscope, can be
used to find discontinuities on long runs of cables...
Frequency Counter
This is a project developed by Tom Napier for Circuit Cellar Inc.
It's a good fundamental circuit based on a PSoC chip...
Reflectometer
Faults such as opens, shorts, or mismatches can be precisely
located along the length of a cable by using a time-domain
reflectometer. This device launches a rectangular pulse toward the
cable's end and waits...
Inclinometer
An inclinometer (tilt-measuring circuit) whose sensor (SN1) is
filled with liquid electrolyte. Acting as a potentiometer, the
inclinometer produces a voltage proportional to tilt on its center
electrode...
Altimeter
The current concept incorporates a wireless transmitter and
receiver and is thought to be used for remote controlled airplanes
or appliances with two seperate parts. In other words, we have one
dedicated transmitter (acquisition, filtering) and one dedicated
receiver...
Logic Probe
This project is a combination Logic Probe and Logic Pulser. It is
capable of testing all sorts of digital and microcomputer
projects...
Engineer's
Assistant
The instrument is battery operated and all data is displayed on a
2X20 LCD display. I found this project in the Microchip
Applications Notes Section some time ago...