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40Mhz-universal-counter – Circuit Schematic
40Mhz-universal-counter
This circuit can be used to measure frequencies up to 40 MHz. To obtain the correct measured value, it is necessary to divide the oscillator frequency and th...
10Mhz-frequency-counter – Circuit Schematic
10Mhz-frequency-counter
The circuit consists of ICM7208 seven-decade counter U1, ICM7207A oscillator controller U2, and CA3130 biFET op amp U3. IC U1 counts input signals, decodes the...
Low-cost-frequency-counter – Circuit Schematic
Low-cost-frequency-counter
This counter uses a four-digit display, but with a flip of the range switch, it can display frequencies from 1 to 40 MHz, with a resolution of 100Hz. The MM74C...
Capacitance-meter – Circuit Schematic
Capacitance-meter
U1a is an oscillator and U1b tbe measurement part of tbe circuit. It converts unknown capacity into a pulse-width modulated signal the same way an·automotiv...
Digital-ad-capacitance-meter – Circuit Schematic
Digital-ad-capacitance-meter
The circuit charges and discharges a capacitor at a crystal-controlled rate, and stores on a sample-anddifference amplifier the change in voltage achieved. The...
Auto-zeroing-scale – Circuit Schematic
Auto-zeroing-scale
Electronic scales have come into wide use and the HA-510X, as a very low noise device, can improve such designs. This circuit uses a staingauge sensing element ...
Digital-tach-dwell-meter – Circuit Schematic
Digital-tach-dwell-meter
The heart of the circuit is ICZ, a 4046 micropower phase-locked loop (PLL). The incoming signals are fed to the PLL after being buffered by IC1a and its associ...
Half-flash-adc – Circuit Schematic
Half-flash-adc
An aid conversion technique which combines some of the speed advantages of flash conversion with the circuitry savings of successive approximation is termed ha...
Tracking-adc – Circuit Schematic
Tracking-adc
The analog input is fed into the span resistor of a DAC. The analog input voltage range is selectable in the same way as the output voltage range of the DAC. T...
Current-shunt-amplifier – Circuit Schematic
Current-shunt-amplifier
This circuit measures the power -supply current of a circuit without really having a currentshunt resistor: R1 is only 3 em of #20 gauge copper wire. A length o...
Suppressed zero meter – Circuit Schematic
Suppressed zero meter
A zener diode placed in series with a voltmeter will prevent the meter from reading until the applied voltage exceeds the zener voltage...
Wide band AC voltmeter – Circuit Schematic
Wide band AC voltmeter
This voltmeter is capable of measuring ac signals as low as 15 mV at frequencies from 100 Hz to 500 kHz...
Fet voltmeter – Circuit Schematic
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 ...
Ultra-precision v-f converter – Circuit Schematic
Ultra-precision v-f converter
The circuit is capable of better than 0.02% error and 0.003% nonlinearity...
Basic digital thermometer – Circuit Schematic
Basic digital thermometer
Maximum reading on the Celsius range is 199,9 °C, limited by the (short-term) maximum allowable sensor temperature. Maximum reading on the Fahrenheit range i...
Digital thermometer with zero adjust – Circuit Schematic
Digital thermometer with zero adjust
This circuit allows zero adjustment as well as slope adjustment...
Basic digital thermometer – Circuit Schematic
Basic digital thermometer
The Kelvin scale version reads from 0 to 1999 °K theoretically, and from 223 °K to 473 °K actually...
AC hot wire probe – Circuit Schematic
AC hot wire probe
Insert the probe tip into either terminal of an ac outlet and hold the probe body against anything that the circuit ground is connected to. The LED will glow wh...
Bridge circuit – Circuit Schematic
Bridge circuit
For measurement of resistances from about 5 ohms down to about 1/10 ohm...
Linear scale ohmmeter – Circuit Schematic
Linear scale ohmmeter
One preset resistor is used for all the ranges, simplifying the setting up. Diode clamping is included to prevent damage to the meter if the unknown resistor is...