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Digital Volt and Amp Meter – Circuit Schematic
Digital Volt and Amp Meter
The PIC Microchip Processor must be programmed before it will function as a Volt & Amp meter. There are many internet sites and PIC programmers that you can use...
Km Counter / meter circuit – Circuit Schematic
Km Counter / meter circuit
This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants' pocket and the display is conceived in the follow...
Analogue Pulse Counter Schematic – Circuit Schematic
Analogue Pulse Counter Schematic
It was designed for an application in a welding machine: there are lots of bits of machinery which are cylindrical in shape and which are subjected to heavy sur...
Analogue Tachometer and Dwellmeter – Circuit Schematic
Analogue Tachometer and Dwellmeter
This circuit as first published in Wireless World September 1975 and subsequently in MECRM. It's built around a TTL quad NOR gate, though CMOS could be used....
Component Signature for Oscilloscope – Circuit Schematic
Component Signature for Oscilloscope
The general (and very basic) principle of operation is shown in Figure 1. The test signal is simply derived from the mains, and is a sinewave at 50 or 60Hz. In ...
Capacitor internal resistor meter – Circuit Schematic
Capacitor internal resistor meter
The design presented here works by applying a 50kHz, 200mV square wave to the capacitor under test, in series with a 10 Ohm resistor. The AC voltage appearing a...
Digital Voltmeter with ICL7129ACPL A/D converter – Circuit Schematic
Digital Voltmeter with ICL7129ACPL A/D converter
This 4 1/2-digit DVM circuit is built around a Maxim ICL7129ACPL A/D converter and LCD driver. An ICL8069 CCZR 1.2-V band-gap reference diode is used for a volt...
Frequency Meter using PC – Circuit Schematic
Frequency Meter using PC
Here is a simple technique for measuring frequencies over quite a wide frequency range and with acceptable accuracy limits using a PC. It follows the basic tech...
Analog to Digital Converter with ADC0808 – Circuit Schematic
Analog to Digital Converter with ADC0808
Normally analogue-to-digital con-verter (ADC) needs interfacing through a microprocessor to convert analogue data into digital format. This requires hardware a...
Mini Oscilloscope schematic – Circuit Schematic
Mini Oscilloscope schematic
Probably the best advantage is its very small size and the fact that it can run off the power supply of the circuit being tested. Although it has a low frequenc...
Advanced LCD Graphic thermometer – Circuit Schematic
Advanced LCD Graphic thermometer
A unified thermometric controller that can be programmed with simple scripts, integrating the "classic" thermometer/controller pair. You can build a variety of ...
220V Mains Quality Monitor – Circuit Schematic
220V Mains Quality Monitor
With this circuit you will be able to monitor the quality of the mains. There are 4 distinct sections, each supervising a parameter pertinent to the quality of ...
Analog Mains Frequency Meter – Circuit Schematic
Analog Mains Frequency Meter
Mains frequency is pretty stable and it is unlikely that you have to measure it but if you have an emergency generator you might find this circuit useful as it ...
LCD Car Accelerometer – Circuit Schematic
LCD Car Accelerometer
The circuit is drawn for measurement of acceleration from 1000 mg until + 1000 mg. It can be placed in kantra'n the car and be supplied from the sheath of elect...
Audible Milliohmmeter with 555 – Circuit Schematic
Audible Milliohmmeter with 555
This project uses a four-point resistance measurement process also known as the Kelvin method. This procedure uses a current source to determine the value of an...
Decibel-o-meter and white noise generator – Circuit Schematic
Decibel-o-meter and white noise generator
Noise level measured into 75ohm 3.1kHz BW using Siemens D2006 level meter: -80dBU (77.5mV) from zero to 1MHz and drops 3dB on 17MHz. Decrease the first coupli...
Thermal Power Meter – Circuit Schematic
Thermal Power Meter
After one has built a QRP transmitter, it would be interesting to know the exact amount of output power. Without a power meter the peak to peak voltage Vss is m...
1 GHz Frequency Counter – Circuit Schematic
1 GHz Frequency Counter
This very simple counter can be used to measure the frequency of various wireless devices. Applies in reviving the transmitter and its operation as a control mo...
Decade resistor box – Circuit Schematic
Decade resistor box
This device was designed to use two generic-patterned, pre-made, pre-drilled circuit boards that are available from Radio Shack, and other places. Parts consist...
20 LED VU meter – Circuit Schematic
20 LED VU meter
A circuit of measurement of level based on a typical application of National. The circuit round the IC1 makes input adaptation and amplification with the trimm...