Turn your Digital Voltmeter into an Inductance and capacitance meter. Page 1. Page 2. Products 1 – 20 of 22 Source LCR Meter Accessories at ; the leading distributor of IT, Test Peak Electronic Design LLSm LCR Meter Adapter.
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To my surprise, it actually worked just fine, 1K in series was sufficient to allow knductance useful calibration and didn’t overload the drive capabilities of the last gate in the package. The pulse width that is proportional to the inductance is made by drving the unknown inductance through a resistor and connecting the resultant sawtooth waveform to the input of another schmitt trigger which, because of the sharp switching action on its output that results from its hysteresis, provides a nice rectangualr pulse.
Simple Audio Signal Injector Here’s a signal injector for those of us like me who don’t have a bench full of nice test equipment. Forums New posts Search forums. Welcome to our site!
Here is the unit measuring a 33 uH commercial RF choke. The inductance tester converts the inductance value of the coil being tested to a voltage which can be measured by a voltmeter. I had run across the forerunner of this circuit, one that is more sophisticated in that it has a zero adjustment and range switch, but it was limited to higher inductances. The procedure is straightforward: A switch S2 is used to configure the measurement circuit.
There is a remote possibility inductsnce you are using a damaged 74HC14, but check this last since it indctance very likely. You can control lights, fans, AC system, computer, printer, amplifier, robots, garage door, security systems, motor-driven curtains, motorized window blinds, door locks, sprinklers, motorized projection screens and anything else you can think of. Inductance Meter In-Use The resolution of the analogue meter obviously limits its performance, but I generally use it to just ensure I am in the right ballpark while winding coils or picking from inductwnce junk box.
More precise measurements I do with a resonance bridge. The transistor Q1 is used to amplify the signal to provide sufficient current through potentiometer R8 and a load circuit. The circuit relies on a voltmeter with a millivolt range and a high input impedance as a readout device, so it doesn’t have a buffer on the output. It works as an oscillator whose frequency is determined by the RC components R In the one I built I used a pair of alligator clips soldered to stout wires inductqnce couple of cm long.
Inductors with iron cores, high permeability ferrites, or with large amonts of shunt capacitance cannot be measured accurately. The switch S2 is in position “C”. At first, adjust potentiometers R Never mind, just adjust the oscillator frequency keter you get it to calibrate.
The last inverter in merely to make the pulse positive in polarity so that the voltage increases as the inductance increases. To participate you need to register. The voltage is negative. Author carbonzit Creation date May 25, Media New media New comments Search media. It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of electrolytic capacitors. This RC network operates as inductane integrator circuit. When the switch S1 is in “C” position, it connects another diode into the circuit, making a voltage doubler rectifier circuit see the Figure 3.
This device is an addon to a digital inductabce analog voltmeter. It can be connected to any type of stereo audio source such as adspter, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground. It is a very useful bench test equipment for testing and finding out the frequency of various devices indictance unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc.
MFJ Enterprises Inc.
Headphone amplifier is small enough to fit in Altoids tin box, and thanks to low power consumption may be supplied from a single 9V battery. I needed a way to measure hand-wound RF inductors in my second lab, and since I would only be doing this occasionally, I didn’t need anything fancy, and since once a friend finishes his AT90Sbased design, I plan to make one myself, I figured I’d use this for less than a year, so Inducance didn’t want to invest a lot of time in making it.
Just saying hello Started by MichaelaJoy Yesterday at 6: If it isn’t, its probably because the thresholds on the 74HC14 are not symmetrically positioned around 2. Click here to register now.
FOA – LC Connector adapter
This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors.
Pay particular attention to the leads and contacts for LX. The Circuit 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 pass the pulse through a low pass filter so that only the average voltage comes out, the resulting DC voltage is proportional to the inductance. There is a way to check out the duty cycle at the collector of Q1. How the circuit works The schematic diagram for the inductance and capacitance meter is shown adqpter Fig.
I adapted it to the components I had on hand and changed it so that it would work in the nanohenry to 50 microhenry range. The hysteresis in the schmitt trigger allows it to oscillate with inudctance simple feedback circuit. Real-Time ‘Stopwatch’ This is a simple electronic “stopwatch” you can use to time an event.