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Frequency counter Divider schematic – Circuit Schematic
Frequency counter Divider schematic
The divider design is pretty self-explanatory. One can choose between division by 1, 10 or 100 or no output (tied low) using the CONTROL input connected to the ...
Frequency counter Counter schematic – Circuit Schematic
Frequency counter Counter schematic
The counter makes use of 5 cascaded CD40110 which combine a decade counter, a display latch and a 7 segment LED driver in a single chip. (The decimal points are...
Frequency counter Connection diagram – Circuit Schematic
Frequency counter Connection diagram
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Frequency counter BNC input schematic – Circuit Schematic
Frequency counter BNC input schematic
This is a CMOS-compatible (and hopefully also TTL) input featuring over- and under-volatage protection. Schmitt triggers are used to allow for input with long t...
FET VOLTMETER – Circuit Schematic
FET VOLTMETER
With FET in one leg of Wheatstone bridge, meter has input impedance of over 1 megohm. With no input voltage, adjust R4 so meter reads zero. With 9-V battery, RI...
ac POWER MONITOR – Circuit Schematic
ac POWER MONITOR
The 0-to 130-V voltmeter and neon "AC PWR" lamp provide an average indication of the ac power. The fuse and metal oxide varistor(MOV)protect the monitor against...
BAR GRAPH READOUT VOLTMETER – Circuit Schematic
BAR GRAPH READOUT VOLTMETER
Sections of RS339 quad comparator each drive LED to give indications of four different input voltage levels, While LED 1 is connected to ground for use as zero ...
THREE RANGE LIGHT METER – Circuit Schematic
THREE RANGE LIGHT METER
Uses probe containing Clairex 905HN light-dependent resistance element, connected to DC differential amplifier driving meter having specially calibrated scale. ...
FOUR MODE FREQUENCY COUNTER – Circuit Schematic
FOUR MODE FREQUENCY COUNTER
This counter can measure frequencies from 2 Hz to 1 MHz, time interval, and period, and count random events. A 74C926 and 74C925 are used as the counter, and th...
FAHRENHEIT CENTIG RADE LED THERMOMETER – Circuit Schematic
FAHRENHEIT CENTIG RADE LED THERMOMETER
National LX5700 temperature transducer provides input for code conversion circuit driving 3-digit LED display indicating temperature range from -40ƒ to +100ƒ ...
SINGLE CHIP DIGITAL VOLTMETER – Circuit Schematic
SINGLE CHIP DIGITAL VOLTMETER
This 4 1/2-digit DVM circuit is built around a Maxim ICL7129ACPL A/D converter and LCD driver. An ICL8069 CCZR 1. 2-V band-gap reference diode is used for a vol...
FREQUENCY COUNTER – Circuit Schematic
FREQUENCY COUNTER
Built around an Intersil 7216 frequency-counter IC, this counter has a basic range of 10 MHz, a 100-MHz prescaler, and an extra frequency divider (IC3). This di...
ANALOG TACHOMETER READOUT – Circuit Schematic
ANALOG TACHOMETER READOUT
The analog display consists of a frequency/voltage converter (IC12) and bar-graph segment drivers IC10 and IC11. R34 is the calibration adjustment and is set so...
PERIOD TO VOLTAGE CONVERTER – Circuit Schematic
PERIOD TO VOLTAGE CONVERTER
When the input goes from low to high, a narrow positive pulse is generated at point A. This pulse becomes - 13 V at point B, which cuts off D2. ICC`s V+ voltage...
WIDE RANGE AC VOLTMETER – Circuit Schematic
WIDE RANGE AC VOLTMETER
In this circuit, a diode bridge is used as a meter rectifier. The offset voltage is compensated for by the op amp, since the bridge is in the feedback network. ...
FET VOLTMETER 1 – Circuit Schematic
FET VOLTMETER 1
This FETVM replaces the function of the VTVM and rids the instrument of the usual line cord. In addition, FET drift rates are far superior to vacuum tube circui...
SENSITIVE RF VOLTMETER – Circuit Schematic
SENSITIVE RF VOLTMETER
This schematic shows a peak-reading diode voltmeter driven by two stages of amplification. A 100- F capacitor provides a fairly large time constant, which resul...
FET VOLTMETER – Circuit Schematic
FET VOLTMETER
A2N3819 FET provides a solid state VOM ‚The 2N3819 acts as a cathodefollowerin a VOM The biasoffset(meter null) is obtained with R14 and R12 sets full sca...
AC VOLTMETER – Circuit Schematic
AC VOLTMETER
CA081 and CA3140 BiMOS op amp offer minimal loading on the circuits being measured ‚The wide bandwidth and high slew rate of the CA081 allow the meter to oper...
FLOW METER – Circuit Schematic
FLOW METER
Simple opamp circuit with one transistor gives reliable hot-wire anemometer for measuring flow of gases or liquids. R2 is heated above ambient temperature in Wh...