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Instrumentation Schematics

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...

Simple pH Meter
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...

Inductance Meter
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...

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