Circuits & Schematics: frequency meter - 3
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- .. An electromagnetic field probe designed to detect changing electric and magnetic fields. The probe has switchable gain, a frequency response up to 400kHz and independent audio and meter monitoring. Click to enlarge Circuit Notes This ...07-09-2010
- .. If the second hand is re-attached, then you don't have to wait very long to see evidence of the clock counting our timebase frequency - the second hand will advance. The second hand should advance every 59 seconds, and the 'Freq' preset ...
.. 'Freq' preset in the simple timebase should be adjusted until this is the case (if you are lucky enough to own a frequency meter, then adjust for a frequency of 554.83 Hz). Once set, the second hand can be removed again, and the clock ...12-02-2009
- .. IC3 IC4 divide by 10 and drive the displays. P1 resets the counters and P2 enables the displays. IC1C generates an audio frequency square wave that is enabled for a short time at each monostable count. Q1 drives the piezo sounder and ...
.. is avoided because to reset the circuit both pushbuttons must be operated together. Obviously, this is not a precision meter, but its approximation degree was found good for this kind of device. In any case, the most critical thing to ...04-08-2009 - .. the battery when the battery reaches a preset full voltage. MPPT controllers use an inductor for energy storage and a high frequency switching circuit to transfer the energy to the battery. This circuit is for a shunt-mode charge ...
.. The battery should be pre-charged for easiest alignment. Point the panel at the sun, and monitor the battery voltage with a meter. Adjust the 20 turn 100K potentiometer until the Full LED starts to flash, then tweak the potentiometer until ...30-10-2009 - .. supply, mains wiring or other electrical device. There will be a deflection on the meter and sound in the headphones if the frequency is below 15KHz. Parts List IC1 TL084 D1 1N4148 L1 1mH radial inductor part 187LY-102J R1 470k R2, R5, ...
.. of the probe cable, and the impedance of the inductor itself. The cable capacitance was measured by a capacitance meter and came out at 1.9pF, so 2pF was added in parallel with L2 which is the probe inductor. The simulation ...07-09-2010 - .. With a large color television or color monitor flyback, 30,000 V or more will be made possible with 24 VDC. The operating frequency is in KHz to 10 KHz range depending seconds of VDC, the load and the specific flyback. You can ...
.. to a high-voltage multiplier or HV rectifier diodes rectifiers decline is far greater than the battery voltage used in your meter. However, a connection with a liquidation infinite resistance to all other terminals may be the HV return. The ...05-12-2010 - .. displays, and it may be useful in designing a lowcomponent- count, low-power, and lowcost LED-display module for a 24-bit frequency meter, for example. You can use the circuit in Figure 1 to replace classical designs for digital ...10-06-2011
- .. intended for RF wireless applications in the sub-1 GHz band. It is designed to operate both in the license-free ISM and SRD frequency bands at 169, 315, 433, 868 and 915 MHz. This application note outlines the expected performance when ...
.. when using the SPIRIT1 with a range extender under EN 300 220-1 (v2.3.1, 2012-02) in the 169.400 - 169.475 MHz band, meter reading, tracking and tracing applications. The maximum allowed output power in this sub-band is +27 dBm (500 ...22-11-2013 - .. at a supersonic rate for instance, 25 kHz. The rate that the oscillation is switched off and on is called the quench frequency. This frequency should be above the limit of human hearing, but otherwise as low as possible. High ...
.. from the form. The coil is tapped one half turn from the 9 volt supply side to make a connection for the antenna. A one meter long wire antenna is sufficient. The 0.04 to 6 pF capacitor is used to tune in stations. The tuner needs an ...18-10-2016 - .. comparator’s output goes high, an audio-relaxation oscillator built around the other half of U1 is also enabled. The frequency of this oscillator is adjusted by R8 and C3 to be in the audio range (1300 Hz for the values ...
.. available; one good choice is Audio Test set [ 2 ] from Darkwood Designs. This free software also incorporates a level meter which measures the input-voltage level applied to the mic/line input of the computer’s sound card (Fig. ...25-11-2016
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