PC Temperature Meter
This is a four-channel temperature measurmet adapter that works without external power supply. It will suitable for measureing temperature and logging its data ...
Digital Lux Meter
Photo diode outputs light current that is well proportional to input light power when it is used in short mode. In this lux meter, the output current is convert...
Continuity in Circuit Tester
Continuity tester to check continuity in the circuit (Insakittochekka) is. The continuity check over the circuit board wiring that can be checked at a lower vol...
Capacitance meter with 555
The tool is based on a NE555 (or LM555) timer i.c., wired as an astable multivibrator. The frequency of the multivibrator is determined by the value of the unkn...
Oscilloscope 4 Channel Adapter
The method goes by the switching method. Making it be possible to see four kinds of the input signals at the same time by switching them at the short period. In...
Voltmeter circuit
A high-input-resistance op-amp, a bridge rectifier, a microammeter, and a few other discrete components are all that are required to realise this versatile circ...
1 KHz Synchronous Detector
This circuit employs a synchronous demodulator to separate a 1 KHz signal from noise and measures the amplitude of the 1 kHz signals once a second at about 60 ...
Wireless Coupled Frequency Meter
A 0 to 2 MHz ferquency meter with a Minimum Mass Wireless Coupler, based on the ATMega8.Range to the Minimum Mass Base Unit is 10 to 15 cm. Since the frequency ...
Frequency Meter and Pulse Generator with AT902313
Power input is to a 7805 5 volt regulator. A pair of LEDs is connected between the 5 volt supply and ground, with current limiting resistors in series and one p...
RF Inductance adaptor for multimeter
The circuit's operating principle is that if you make a pulse width proportioal to inductance, and keep the pulse frequency and amplitude constant, and then pas...
LC Resonant Frequency Meter
Recently, I have needed to measure inductances in the hundreds of microhenries to several millihenry range. Though I have a pretty good LRC meter and an excelle...
LED Digital Panel Meter
To explain in a little more detail, using the ATMEGA8's internal 2.5 volt band gap reference means that by using a resistive divider ahead of the A-to-D conver...
AVR Inductance / Capacitance meter II
If this picture (above) looks a lot like the Pretty Good LC Meter also on this web site, that's because its the same meter, but with some significant improvemen...
AVR Inductance / Capacitance meter
This instrument requires two precision components: A precision capacitor and a precision inductor. You only need to start with one precision component, either t...
milliohmmeter with AT90S2313
A milliohmmeter is just the tool for checking trace resistance on a printed circuit board, tracking down shorted traces, and measuring the contact resistance of...
AC Millivoltmeter Adapter
Diode detectors are good at changing AC into DC, even at high frequencies. The main problem with diode detectors have inherent nonlinearities, particularly for ...
Frequency Peak Detecting Probe
This is a handy companion for a digital voltmeter. Its allowed me to do a lot of things I used to use my oscilloscope for, and in addition it measures voltages ...
Scope Probe Adapter
The capacitance between the wire and the probe would form a capacitive voltage divider with the probe's input capacitance, and at frequencies significantly high...
1 Khz Inductance Meter ATTINY861
1 kHz is a commonly used test frequency, and I resolved to see if I could make an inductance meter that uses a 1 kHz test signal at a low level. I also wanted t...
Frequency Meter
This basically the frequency meter section of the frequency meter/pulse generator based on the AT90S2313 described elsewhere on this site, combined with the 100...