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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It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of electrolytic capacitors.
Author carbonzit Creation date May 25, neter For example, use a 1 microhenry inductor and adjust the potentiometer to get mv on the DVM. To my surprise, it actually worked just fine, 1K in series was sufficient to allow a useful calibration and didn’t overload the drive capabilities of metdr last gate in the package.
This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors. Connect a battery and a DVM digital volt meterput a known inductor in the LX position then adjust the potentiometer until you get the anticipated reading on the DVM.
I took this circuit from this page on the QRP Homebrew site and made some modifications to it, described below. Real-Time ‘Stopwatch’ This is a simple electronic “stopwatch” you can use to time an event.
It also analyzes transistor’s characteristics such as voltage and gain.
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.
In the one I built I used a pair of alligator clips soldered to stout wires a couple of cm long. The switch S2 is in position “C”. Forums New posts Search forums.
The output waveforms can be both amplitude and frequency modulated. To participate you need to register.
If not, then match the value of the resistor R7 to make shape of the signal as close to square wave as possible. 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.
C5 in feedback circuits. 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.
LC Connector adapter
If yours runs at a greatly different frequency, try changing the oscillator components or try using a 74HC14 made by a different manufacturer. The circuit includes an auto ranging as well as reset switch and produces very accurate and stable readings.
Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Inductors with iron cores, high permeability ferrites, or with large amonts of shunt capacitance cannot be measured accurately. I used it when developing a d. This RC network operates as an ijductance circuit.
Inductance and capacitance meter adapter for DVM This device is an addon to a digital or analog voltmeter. 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. Just saying hello Started by MichaelaJoy Yesterday at 6: If you find the voltage to be very low, say under a volt, then this points to a wriing error, a problem with the 5V regulator or the battery, a damaged 74HC14, or you are using a very low resistance voltmeter.
Potentiometer Questions Started by norbss Yesterday at This circuit is only accurate for broadband inductors.
FOA – LC Connector adapter
How the circuit works The schematic diagram for the inductance and capacitance meter is shown in Fig. When you built this, keep the connections, including gorund connections, short because tens of nanoseconds count.
The last inverter in merely to make the pulse positive in polarity so that the inducance increases as the inductance increases. It works as an oscillator whose frequency is determined by the RC components R