Meter Counter Circuits

Counters and meter instruments are digital indicating meters for accurate measurement and display of square wave and pulse input signals. There are several types of counters/meters which differ in frequency ranges and the number of digits that can be displayed. A digital counter represents the count in digital form. Digital counters are the integrated circuits which are used to count the events in the digital systems or computers. Digital frequency meters display the accurate frequencies that are generated by the signal generators. Meter counters can count up and down and can also store data with a powerless non- volatile data backup. Pulse counters are used to count people entering a particular place, or can be used for time measurement. Digital counters also consists of flip flops. The number of flip flops indicates the number of states it has. Digital counters are classified as synchronous and asynchronous counters depending on the type of clock it uses. 100s of circuits for every hobbyist, technician, student, and design professional. An nice reference tool which includes lots of Counters and meter circuits. look at these circuit ideas, some of them may need some modification if they are to work as advertised. Ideas along with pretty good descriptions for each circuit.

Timer Circuits	Counters	Thermometer Circuits
Voltmeters	Clock Circuits	VU Meters
Frequency meter	Checker Circuits
Meters Circuits	Delay Circuits

Undervoltage indicator for battery equipment

Due to the low duty cycle of flashing LED, the average current drain is 1 mA or less. The NE555 will trigger the LED on when the monitored voltage falls to 12 volts..

Remote Field Strength Meter Circuit

This field strength meter consists of a tuned crystal detector producing a dc output voltage from a transmitted signal. The dc voltage is used to shift the frequency of a transmitter of 100-mW power operating at 1650 kHz. The frequency shift is proportional to the received field strength...

Audio-millivoltmeter

This circuit has a flat response from 8Hz to 50 kHz at -3 db on tbe 10-mV range. ..

High-Gain Current Sensor

A high-gain amplifier using a UA741 is used to sense relative voltage drop in a conductor, and therefore current i..

Voltage Comparators

These two comparators are over- and under-voltage comparators. In Fig. 104-5(a), if Vm exceeds the reference voltage, t..

Little dipper

The circuit consists of two basic circuits, the oscillator and the detector. The oscillator uses an FET in a Colpitts configuration. The energy circulating in the oscillator tank is coupled through C4 to the detector circuit, where a small diode (D2) rectifies it, feeding a dc voltage to the Darlington pair (Q2, A3) controlled by the sensitivity control (R3). Any small variations in the bias of the amplifier will cause large variations of current through the LED indicator.....

Divide-By-N + 1/2 Circuit

This circuit, instead of dividing by an integer, divides the input signal by +1/2. With the feedback connections ..

Transistor Checker Circuit

The circuit is built around a 741 general-purpose op amp that is configured as a voltage follower; with the components shown, the op amp has a voltage gain of one. The output of the 741 is used to drive a 50- meter movement. Potentiometer R7 is used to zero the meter and R6 sets the meter`s full-scale reading, Calibrating the meter is a snap. With no input applied to the circuit, set R6 to mid-position and adjust R7 to zero the meter. Once that is done, apply a positive.....

Bird Feeder Monitor Circuit

The first amplifier circuit is a bird phone. In this circuit, the electret mike (MIC1) is mounted in the neck of a large plastic funnel. The amplifier, built around an MC34119 (which is available from D.C. Electronics, P.O. Box 3203, Scottsdale, AZ 85271-3203; Tel. 800-467-7736, and elsewhere), is then placed outside of the funnel with the pickup facing a nearby bird feeder. The output of the amplifier is then connected to a 16- speaker. The amplifier`s voltage gain is.....

Line-current-monitor

A low-cost filament transformer provides a linear indication of the load current in an ac line. ..

Time Delay Flash Trigger Circuit Circuit

The circuit is built around a single 4093 quad 2-input NAND Schmitt trigger...

Telephone Line Tester Circuit

The telephone-line tester consists of nothing more than a meter (that`s used to measure line voltage in the on- and off-hook state), three resistors (one of which is variable), a pushbutton switch, and a modular telephone connector...

Sound-level-meter

Sounds are picked up by MIC1 and fed to the input of the first op amp. The signal is then fed to the input of second op amp Ulb, where it is boosted again by a factor of between 1 and 33, depending upon the setting of range switch Sl. With the range switch set in the A position, R6 is 1 K!:J and R7 is 33 K!:J, so that stage has a gain of 33. ..

Sample-And-Hold Circuit Ii Circuit

Driving a D/A converter with an A/D converter provides an overall analog-hold function, which though limited in output resolution, offers zero voltage droop and infinite hold time. The A/D converter shown (IC1) includes a 12-bit compatible track/hold at its input. The track/hold specifies a 6-MHz full-power bandwidth, a 30-ns aperture delay, and a 50-ps aperture jitter. ..

20 Khz ring counter

The shift pulse turns off the conducting scs by reverse biasing the cathode gate. The charge stored on the coupling capacitor then triggers the next stage. An excessively long shift pulse charges up all the capacitors, turning off all stages. ..

Digitizer

If the tube is level with respect to gravity, the bubble resides in the tube"s center and the electrode resistances to common are identical. As the tube shifts away from level, the resistances increase and decrease proportionally. Transducers of this type must be excited with an ac waveform to avoid damage to the partially conductive liquid inside the tube. The level transducer is configured with a pair of 2-KO resistors to form a bridge. The required ac bridge.....

Scr-ring-counter

One lamp at a time is lit in the string to give the appearance of a moving point of light. ..

Fet voltmeter

This FETVM replaces the function of the VTVM while at the same time ridding the instrument of the usual line cord. In addition, drift rates are far superior to vacuum tube circuits allowing a 0 volt full scale range which is impractical with most vacuum tubes...

Sample-and-hold

The sample-and-hold function has often been accomplished with separate analog switches and op amps. These designs always involve performance tradeoffs between acquisition time, charge injection, and droop rate. The HA-242-/2425 monolithic sample-and-hold. ..

Guarded input picoammeter circuit

The circuit utilizes CA3160 and CA3140 BiMOS op amps to provide a full-scale meter deflection of Â± 3 pA. The CA3140 serves as an 1T0 gain stage to provide the required plus and minus output swing for the meter and feedback network. ..

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Best For Circuit and Wiring: Digital Step Km Counter

Step-Km counter circuit diagram. A normal step was calculated to span around 78 centimeters, thus the LED signaling 50 meters illuminates after 64 steps (or 32 operations of the mercury switch), th...

circuit diagram: Digital Step Km Counter

Accidental reset of the counters 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...

Multi function frequency meter 0-100MHz using ICM7226B ...

are the counter circuit from 0-10 million. - Can test the oscillator circuit himself. - Can hold data. multi-function-frequency-meter-0-100mhz-by-ICM7226B Figure 1 Multi function frequency meter 0-...

Minimalist Dip Meter | circuit & wiring diagram

Minimalist Dip Meter Circuit Diagram. A visual show of the dip? Nope, the 'scope can handle that activity. A huge frequency scale? Not vital, as which you might connect a frequency counter for this...

Diagram circuit Source: Geiger Counter Uses Cockroft Walton ...

The circuit is compatible with several Geiger Muller tubes and three types of indication are provided: the good old-fashioned audible click with each discharge, a flashing LED or an analog meter pr...

Frequency Counter Circuit using Micro Controller - SlashDocs

So If we count the number of cycles recorded in a second it will directly read the frequency.So what we are going to make is a frequency counter circuit, which can also be called as a frequency met...

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