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Picoammeter circuit – Circuit Schematic
Picoammeter circuit
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 fro...
Ammeter with six decade range II – Circuit Schematic
Ammeter with six decade range II
The Ammeter measures currents from 100 pA to 100 µ without the use of expensive high value resistors. ...
Guarded input picoammeter circuit – Circuit Schematic
Guarded input picoammeter circuit
The circuit utilizes CA3160 and CA3140 BiMOS op amps to provide a full-scale meter deflection of ± 3 pA. The CA3140 serves as an 1T0 gain stage to provide th...
Pico ammeter – Circuit Schematic
Pico ammeter
Care must be taken to eliminate any stray currents from flowing into the current summing node. This can be accomplished by forcing all points surrounding the in...
Current sensing in supply rails – Circuit Schematic
Current sensing in supply rails
This capability has wide application in battery and solar-powered systems. If the ground-referred voltage output is unloaded by an amplifier, the shunt can oper...
Ammeter with six decade range – Circuit Schematic
Ammeter with six decade range
The Ammeter measures currents from 100 pA to 100 µ without the use of expensive high value resistors. ...
10 Mhz universal counter – Circuit Schematic
10 Mhz universal counter
The ICM7216A or can be used as a minimum component complete Universal Counter. This circuit can use input frequencies up to 10 MHz at INPUT A and 2 MHz at INPUT...
Analog counter circuit – Circuit Schematic
Analog counter circuit
A straightforward circuit using a LM311 for the level detector and a CMOS analog gate to discharge the capacitor is shown. An important property of this type of...
100 Mhz frequency period counter – Circuit Schematic
100 Mhz frequency period counter
The figure shows the use of a CD4016 analog multiplex to multiplex the digital outputs back to the FUNCTION input. Since the CD4016 is a digitally controlled an...
Rms-to-dc converter – Circuit Schematic
Rms-to-dc converter
The DC output at Pin 1 vanes linearly with the RMS input at Pin 4. 2 CT is tweaked until the svnc signal is in phase with the AC signal. An ac voltmeter may be ...
Fast data aquisition 2 – Circuit Schematic
Fast data aquisition 2
a low cost, high-speed monolithic analog multiplexer. The system works as follows: Selects a channel and initiates a conversion at G = 1 and then looks at the M...
Fast data aquisition 1 – Circuit Schematic
Fast data aquisition 1
This diagram shows a high speed data acquisition system with 8 differential inputs and 12-bit resolution using the AM-543. If the control logic is timed so that...
Frequency comparator II – Circuit Schematic
Frequency comparator II
The circuit provides unambiguous LED + or - bar readout with steps of 0.1%. The reference frequency is multiplied by the PLLIC1 and divider IC9 to output 64 ? F...
Digital capacitance meter – Circuit Schematic
Digital capacitance meter
The principle of operation is counting the pulse number derived from a constant frequency oscillator during a fixed time interval produced by another lower freq...
Capacitance to voltage meter – Circuit Schematic
Capacitance to voltage meter
Timer Ul operates as a free-running oscillator at 60 Hz, providing trigger pulses to timer U2 which operates in the monostable mode. Resistor Rl is fixed and ca...
Bridge balance indicator – Circuit Schematic
Bridge balance indicator
Indicator provides an accurate comparison of two voltages by indicating their degree of balance (or imbalance). Detecting small variations near the null point i...
Fuel-cell battery tester – Circuit Schematic
Fuel-cell battery tester
This circuit was designed for testing fuel cells, but it could also be used for testing batteries under a constant current load. It provides a dynamic, constant...
Ignition pulses counter – Circuit Schematic
Ignition pulses counter
The Digi-Tach contains a master-clock circuits (U6)v latch and reset pulse generators (U2-b-U2-d), input signal bonditioner (Ul, U2-a), pulse counter (U3), disp...
Crystal display (LCD) tester – Circuit Schematic
Crystal display (LCD) tester
Liquid crystal displays are currently available in several versions and various sizes. The wide variety of features, has resulted in there a little chaos in the...
Cyclic A/D converter circuit
The cyclic converter consists of a chain of identical stages, each of which detects the polarity of the input. Step V REF then subtracted from the double entry ...