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comp probe circuit – Circuit Schematic
comp probe circuit
This circuit is a stable frequency counter accurate to 5 significant digits. The range is 0 - 30MHz with an input sensitivity of greater then 100mV. The probe c...
pic based lc meter usb interface – Circuit Schematic
pic based lc meter usb interface
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pic based oscilloscope clock – Circuit Schematic
pic based oscilloscope clock
For those are not into electronics, you must know that an oscilloscope has basically only one timebase to move the spot horizontally from left to right with the...
digital multimeter using 8051 – Circuit Schematic
digital multimeter using 8051
Build a digital multimeter that can measure dc/ac voltages up to 100V and dc/ac currents up to 1A. The circuit will be powered by 9v battery. I have decided to ...
tachometer c code – Circuit Schematic
tachometer c code
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dc voltmeters – Circuit Schematic
dc voltmeters
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low power led battery voltmeter – Circuit Schematic
low power led battery voltmeter
This is a low power voltmeter circuit that can be used with alternative energy systems that run on 12 and 24 volt batteries. The voltmeter is an expanded scale ...
acoustic daq mathematica – Circuit Schematic
acoustic daq mathematica
For physical computing or amateur science projects, you often need to be able to get the output of a sensor or transducer into your computer.  There are a lot ...
simple supply voltage monitor – Circuit Schematic
simple supply voltage monitor
A circuit for monitoring supply voltages of ±5 V and ±12 V is readily constructed as shown in the diagram. It is appreciably simpler than the usual monitors t...
cable test – Circuit Schematic
cable test
Imagine being faced with a dozen or more cable ends, all the same colour and bearing no identification. The other ends emerge in another part of the building, a...
inductance meter – Circuit Schematic
inductance meter
A device for measuring inductance Over the years, articles describing devices for measuring inductance have appeared in QST, and elsewhere, but none of them wer...
zener diode tester schematic – Circuit Schematic
zener diode tester schematic
Using electronic scheme below can be designed a zener diode tester using few electronic parts. Using this zener tester and a multimeter can be measured and dete...
octopus curve tracer – Circuit Schematic
octopus curve tracer
This project involves the construction of a low-cost curve tracer that is suitable for testing a wide variety of electronic components both in-circuit and out o...
simple field strength meter – Circuit Schematic
simple field strength meter
The multimeter should be set to the lowest dc volts range for maximum sensitivity. This is normally 200mV DC for most meters. The circuit works well at VHF (aro...
simple swr and pwr meter – Circuit Schematic
simple swr and pwr meter
Many SWR / Power meter used by amateurs to the extent reasonably accurate continuous average power with a CW key-down signal, but can not reliably be used with ...
simple analog to digital converter – Circuit Schematic
simple analog to digital converter
Normally analogue-to-digital converter (ADC) needs interfacing through a microprocessor to convert analogue data into digital format. This requires hardware and...
s meter – Circuit Schematic
s meter
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RF Induction Meter – Circuit Schematic
RF Induction Meter
This instrument measures inductances from 0. 1 microhenry to 3 millihenries divided into four ranges set by a switch. It operates from 12 volts, and is powered ...
Q Meter – Circuit Schematic
Q Meter
The Q meter has been an essential piece of equipment for laboratories engaged in the testing of radio frequency circuits. In modem laboratories, the Q meter has...
Line Bal Test Meter – Circuit Schematic
Line Bal Test Meter
A simple meter to check the balance of currents running in the two legs of a transmission line. It can be used to check the balance of currents between the inne...