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PC RLC Meter (BETA) Builders – Circuit Schematic
PC RLC Meter (BETA) Builders
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LM Frequency Meter – Circuit Schematic
LM Frequency Meter
The Model LM-13 Crystal Calibrated Frequency Indicating Equipment has been specially designed to provide a simple, accurate and reliable frequency indicating eq...
Vacuum-Tube Voltmeters – Circuit Schematic
Vacuum-Tube Voltmeters
Vacuum-tube or electronic voltmeters make use of some of the unique characteristics of electron tubes, and so are available in many types. They are available fo...
Fundamentals of Electrical Engineering and Sensitive voltage detector – Circuit Schematic
Fundamentals of Electrical Engineering and Sensitive voltage detector
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Fundamentals of Electrical Engineering and High-impedance voltmeter – Circuit Schematic
Fundamentals of Electrical Engineering and High-impedance voltmeter
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Fundamentals of Electrical Engineering and Slope (integrating) ADC – Circuit Schematic
Fundamentals of Electrical Engineering and Slope (integrating) ADC
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A four channel X/Y oscilloscope multiplexer – Circuit Schematic
A four channel X/Y oscilloscope multiplexer
I have some Tektronix oscilloscopes with appropriate plug in units yielding an four channel display, I always wanted something else: A true four channel oscillo...
A simple TTL modulated diode laser – Circuit Schematic
A simple TTL modulated diode laser
Measuring distances using a modulated laser. The circuit I created (see above) is very simple and does not need many explanations. The first part consists of a ...
Victoreen Model CD V-700 Schematic Diagram – Circuit Schematic
Victoreen Model CD V-700 Schematic Diagram
This is the 6A schematic that was in the bottom of the unit. It is incorrect. These units have been banging around for over 40 years. Many bottoms have been swi...
Wide Dynamic Range Field Strength Meter – Circuit Schematic
Wide Dynamic Range Field Strength Meter
A field strength meter is a very handy tool for locating a transmitter. A sensitive field strength meter by itself has some limitations, however: It will respon...
PIC based Oscilliscope – Circuit Schematic
PIC based Oscilliscope
In order to accomplish this my initial thought is to sample an input (ADC) at consistant time increments and then display the waveform on a graphic lcd display....
Audio mV Meter – Circuit Schematic
Audio mV Meter
This was my first AS Electronics project which I built way back in 1998! The original report, with diagrams, is shown here and a PDF version of the report is av...
Catching the Falling Drop – Circuit Schematic
Catching the Falling Drop
The goal is to take photos of some fairly quick process (well, at least too quick for the human eye) at exactly specified times with sub-millisecond accuracy. O...
High-Speed Photos of Low-Speed Impacts – Circuit Schematic
High-Speed Photos of Low-Speed Impacts
The goal is to freeze different stages of some fairly quick process (at least when compared to the time resulotion of the human eye). Since I don`t have fancy t...
USB Live Oscilloscope: Main Board – Circuit Schematic
USB Live Oscilloscope: Main Board
The two input boards ( ADCV or digital ) get connected to AD_CTL1, AD_DATA1, AD_SUP5V_1, AD_SUP3V3_1 for the first board and the same names with suffix 2 for th...
USB Live Oscilloscope: Digital Input Board – Circuit Schematic
USB Live Oscilloscope: Digital Input Board
The digital input board has 8 distinct digital inputs available on JP1. There are separate pull-down resistors (RN1, choose a value you like, e. g. 1MOhm) and t...
USB Live Oscilloscope: ADCV Board – Circuit Schematic
USB Live Oscilloscope: ADCV Board
The analog input is first fed into a fast non-inverting buffer amplifier (OPA353) set up for unity gain which protects the analog-to-digital converter from out-...
High Precision Volt Meter – Circuit Schematic
High Precision Volt Meter
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Frequency counter Logic schematic – Circuit Schematic
Frequency counter Logic schematic
The lower schematic is a pretty standard bidirectional rectifier together with capacitors and a 7805 as a fixed 5V source which supplies all the electronic in t...
Frequency counter Input schematic – Circuit Schematic
Frequency counter Input schematic
The master mode selection switch is IC6 which switches the 4 mode LEDs (which also correspond to the measured unity, i. e. kHz, counts, milli-seconds or seconds...