Meter Counter Circuits
An Intersil 7101 31/2-digit A/D converter is used to display the duty cycle of a pulse train as a percentage. The frequ
The complete meter amplifier is a differential current-to-voltage converter with input protection, zeroing and full scale adjust provisions
This circuit develops an output voltage that is proportional to the magnetic induction, B, flowing through its probe"s coi
Digital Altimeter Circuit
A pressure sensor (IC4) is used with a dc: amplifier to convert the bridge output (IC4) to a single-ended voltage. ICld provides a reference voltage for setting barometric pressure. IC3 is an A/D converter manufactured by Intersil. This drives an LCD module. Calibration reads out in fact.
This design is for an external signal strength meter that is analog, digital, and audible for mobile transmitter hunters. The S meter also incorporates a gain circuit. The digital LED bar graph display has a very fast response time. The 3.3-KO resistor near LM3914 can be replaced with a 5-K pot to control LED brightness. The S2A position gives a 2:1 gain and the S2B position gives about a...
The 5-MHz track and hold shown here has a 400-kHz power bandwidth driving Â±10 V. A buffered input follower drives the hold capacitor, C4, through Ql, a low resistance FET switch. The positive hold conuuand is supplied by TTL logic, with Q3Ievel shifting to the switch driver, Q2. The output is buffered by A3. When the gate is driven to V-for hold, it pulls the charge out of the hold...
Channel 1 is wired as a voltage follower and is turned on during the track/sample time. Ifthe product of R x Cis sufficiently short compared to the period of maximum output frequency, or sample time; Cwill charge to the output level.
A standard shaft encoder"s A and B ports generate square waves with the same frequency as the shaft turns. The phase of A will lead or lag that of B by 90Â°, ~depending on the direction of rotation. To obtain maximum resolution, the tachometer circuit must count every change of the state for the A and B signals. Each such change causes a change of state at IC1A"s output, followed by a 1-!LS...
Using Linear Technology LT1027 reference and LT1078 op amps, transducer T1 is fed with 1.5 mA. The pressure transducer f
Capacitor Esr Measurer
The equivalent series resistance (ESR) of a capacitor can be measured using this circuit and an ac voltmeter. Ul fun
Harmonic Distortion Analyzer Circuit
The circuit includes a low-distortion, 1-kHz oscillator and will measure THD at a user selected voltage level for voltage amplifiers, or for checking amplifiers of power levels to 600 W. It will detect THD levels of .005% (-86 dB). A built-in one-percent THD calibrator is included.
Here is a simple tachometer circuit for use with a hand-held DVM or portable chart recorder. A novel feature is that the source frequency pulse/rev rate can be directly set on a ten-turn potentiometer to provide a convenient calibration of one V per 1000 rev/min. This is particularly useful when measuring a shaft or engine speed by sensing gear teeth.
Four-Trace Oscilloscope Adapter
This simple adapter uses an oscillator (567) to drive a counter (U2) and switch (U3) that selects the outpu
Digital Tachometer Counter
This circuit produces a readout for the digital tachometer circuit. IC9 is a 3-digit LED display driver, counter
Ac Watts Calculator Circuit
The load`s power factor, which is the cosine of the phase angle between the voltage across the load current, can be calculated simply with this circuit. A1:1 isolation transformer is used to prevent direct contact with the line. By properly adjusting Rr, the vector diagram of voltages Vs, Vd, and Vr forms an isosceles triangle, which simplifies the power calculation. The method basically...
Buzz box continuity and coil checker
Differences between shorts, coils, and a few ohms of resitance
A very sensitive pico ammeter (â€” 1 V/pA) employs the amplifier in the inverting or current summing mode. Care must be taken to eliminate stray currents from flowing into the current summing mode. It takes approximately 5 for the circuit to stabilize to within 1% of its final output voltage after a step function of input current has been applied
This tachometer lets you measure heartbeats, respiratory rates, and other low-frequency events that recur at intervals of 0.33 to 40.96 seconds. The circuit senses the period offm, computes the equivalent pulses per minute, and updates the LCD accordingly. Although the decimal readout equals 60 fm, the circuit doesn"t actually produce a frequency of 60 fm.
Simple Absolute Value Circuit
When an input voltage is positive, the output of ICA is negative and diode D does not conduct; hence the outp
Thermally based anemometer
This design used to measure air or gas flow works by measuring the energy required to maintain a heated resistance wire at constant temperature. The positive temperature coefficient of a small lamp, in combination with its ready availability, makes it a good sensor. A type 328 lamp is modified for this circuit by removing its glass envelope. The lamp is placed in a bridge which is monitored by...
The circuit uses the exceptionally low input current (O.lpA) of the CA3420 BiMOS op amp. With only a single 10 megohm resistor, the circuit covers the range from Â±50 pA maximum to a full-scale sensitivity of Â±1.5 pA.
Bandswitched Grid Dip Meter
For checking resonances, tuned circuits, antennas, etc., this circuit covers the 2-to 20-MHz range. Ql serves a
Ammeter with six decade range II
The Ammeter measures currents from 100 pA to 100 Âµ without the use of expensive high value resistors.
Rf power meter
Reflectometer (SWR Power Meter) covers three decadesâ€”from 100 kHz to 100 MHz
Digital Vom Phase Meter
The phase-angle meter will work with either analog or digital inputs. A DVM is used as a readout device. The output
This circuit is designed around a 4049 hex inverter/buffer. Two inverters are used ina dual-frequency signal-injector circuit, another inverter is used as a logic probe, and the remaining three inverters are used as a sensitive dual-input, audio-signal tracer. The signal-injector portion gates are configured as a two-frequency, pulse-generator circuit. Under normal conditions, the...
Zero center indicator for FM receivers
To adjust, tune in a station and adjust the I"M pot for a null. Then ask the station to modulate and fine adjust so modulation peaks don"t light the LEDs
This circuit has a linear reading scale, requires no calibration, and requires no zero adjustment
Frequency Meter Circuits
VU Meter Circuits
Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
Metal Detector Circuits
Liquid Sensing Circuits
Light Sensing Circuits
Voltage Detector Circuits
Air-Gas Detection Circuits
Human Sensing Circuits
RF & Radiation
Optical Sensing Circuits
Free Energy Circuits
AC to DC & DC to DC
Solar Cell Circuits
Micro Power Circuits
Switching Power Supplies
Light Laser LED
Digital to Analog
Analog to Digital
Data Bus Circuits
Voltage to Pulse
Current to Voltage
Frequency to Voltage
RF Converter Circuits
Sine to Square Wave
Voltage to Current
voltage to frequency
Period to Voltage
Video Wall circuits
TV Video Circuits
Motor Control Circuits
8051 / 8052
PCB CAD Software
Car bike Circuits
Electronic VU meter by LM3914 and LM3915
High performance LM3914/LM3915 VU meter circuit projects that widely popular can display with 20 LEDs on stereo or mono with 10 LEDs for all audio system.
Stereo audio vu meter circuit using KA2284 - Electronic projects ...
Here is cheap Stereo audio vu meter circuit with PCB. A poor people and the beginners it has a heart. We would like to propose a electronic VU meter projects on economy model that has stereo each s...
LED Signal Meter using LB1409 - Electronic projects circuits
This project is a sound level meter circuit that easy and very cheap, can drive 9 LED display,The LB1409 is used as base of this circuit makes small size.
Digital Power Meter Circuit - Homemade Circuit Projects
The article explains how to make a simple digital power meter circuit for determining the number of units or the power consumed by an associated load or appliance.
20 LED vu meter schematic – Electronic projects circuits
This is 20 LED vu meter schematic is designed for who want to have a circuit that can drive LED up to 20 pcs.(Stereo 40 LEDs) Which the circuit using a generally IC will can not directly connect to...
Simple Digital voltmeter circuit using ICL7107
For building the digital meter contains accuracy higher than the common meter. The heart of this circuit is IC-ICL7107 old, who is now much cheaper. This IC is a 40 pin model as shown in Figure 1 W...
Analogue Oscilloscopes and Measurements
Transmitters and Receivers
Sensors and Detectors
Sequential Pattern-ANSI Standards
Low Frequency Power Amplifiers
IC Regulated Power Supply
4 Band Resistor Calculator
5 Band resistor Calculator
6 Band resistor Calculator
Parallel Resistors Calculator
LED resistance Calculator
Resistors Calculator of Inverting Op-amp
Resistors Calculator of Non-Inverting Op-amp
Great offers and discounts!
Electronic Kits & Modules
Test & Measurement Instruments
Lab Power Supplies
Meters and Testers
Circuits & Schematics
Digital Electronics Design
Electric Motors & Transformers