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Frequency/Voltage Converter With Sample And Hold – Circuit Schematic
Frequency/Voltage Converter With Sample And Hold
U1 is a frequency/voltage converter, feeding sample-and-hold circuit using an LF381. An LF...
Data Acquisition System Ii – Circuit Schematic
Data Acquisition System Ii
In this circuit, an HA-4900 series comparator is used in conjunction with a D/A converter to form a simple, vers...
Data Acquisition System I – Circuit Schematic
Data Acquisition System I
The HI-506 multiplexer is used as an analog input selector, controlled by a binary counter to address the appropr...
Period-To-Voltage Converter – Circuit Schematic
Period-To-Voltage Converter
The input signal drives ICD. Because ICD"s positive input (V+) is slightly offset to + 0.1 V, its steady state ...
Current-To-Frequency Converter – Circuit Schematic
Current-To-Frequency Converter
Teledyne Semiconductor"s Type TSC9402 IC is eminently suitable as an inexpensive current-to-frequency conver...
Digital Levels Scope Displays 2 Logic Signals On 1 Scope – Circuit Schematic
Digital Levels Scope Displays 2 Logic Signals On 1 Scope
Using this simple resistor circuit, you can trick your oscilloscope into displayin...
Inductance Bridge – Circuit Schematic
Inductance Bridge
This bridge will measure inductances from about 1 to 30 at a test frequency of 5 mHz. A 365-pF AM-type tuning capacitor ...
Battery-Voltage Measuring Regulator – Circuit Schematic
Battery-Voltage Measuring Regulator
This circuit allows a microprocessor system to measure its own battery voltage. A Texas Instrument TI43...
Internal Resistance Battery Tester – Circuit Schematic
Internal Resistance Battery Tester
A designer often needs to know the value of the internal resistance of a battery. Quite a few testers gi...
Voltage Gauge – Circuit Schematic
Voltage Gauge
This circuit uses an RCA CA3162E (IC2) A/D converter. This converter has 12-bit output (BCD) which is sent to display decoder...
Digital Pressure Gauge – Circuit Schematic
Digital Pressure Gauge
Using an intersil ICL 7106 A/D converter chip and an LED display module, this gauge uses a Sensym Corp. pressure tra...
Digital Fuel Gauge – Circuit Schematic
Digital Fuel Gauge
This circuit uses a digital voltmeter (formed from IC1 and IC3) to display fuel quantity as a percentage of a full tank....
Expanded-scale-analog-meter – Circuit Schematic
Expanded-scale-analog-meter
The circuit consists of 0-1 mA meter M1, 6.2-V zener diode D1, and 12-KO, 1 % resistor Rl. R2 is included in the circuit as a load resistor for the zener diode...
Wide-range-ac-voltmeter – Circuit Schematic
Wide-range-ac-voltmeter
In this circuit, a diode bridge is used as a meter rectifier. ...
Peak-program-detector – Circuit Schematic
Peak-program-detector
This circuit will allow a multimeter to display the positive or negative peaks of an incoming signal. A 741, JC1, is used in the noninverting mode with R1 defi...
Fet-voltmeter – Circuit Schematic
Fet-voltmeter
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 circu...
Audio-millivoltmeter – Circuit Schematic
Audio-millivoltmeter
This circuit has a flat response from 8Hz to 50 kHz at -3 db on tbe 10-mV range. ...
Frequency-counter – Circuit Schematic
Frequency-counter
The output frequency from IC pin 3 is determined by the voltage input to pin 6. A standard frequency counter can be used to measure voltages directly over a li...
High-input-resistance-voltmeter – Circuit Schematic
High-input-resistance-voltmeter
A resistance of 1, 000.000 MD takes advantage of the high input impedance of the CA3420 BiMOS op amp. Only two 1.5-V AA-type penlite batteries are required f...
Audio-millivoltmeter – Circuit Schematic
Audio-millivoltmeter
Capacitor C4 couples the output of U1 to a simple attenuator, which is used to provide a loss of 0 dB, 20 dB, or 40 dB, depending on the setting of range switc...