Advertisement
Peak-db-meter – Circuit Schematic
Peak-db-meter
This circuit compares a rectified input, f."!N, with a voltage that decays exponentially across a 4. 7-KO resistor and a ·o.Ol-I"F capacitor. Comparing the ...
Optical-pick-up-tachometer – Circuit Schematic
Optical-pick-up-tachometer
Remote, noncontact, measurement of the speed of rotating objects is the purpose of this simple circuit. Linearity and accuracy are extremely high and normally l...
Low-current-measurement-system – Circuit Schematic
Low-current-measurement-system
This circuit uses a CA018 BiMOS op amp. Low current, supplied at input potential as power supply to load resistor RL, is increased by R2/R1, when load current h...
Digital-frequency-meter – Circuit Schematic
Digital-frequency-meter
The circuit converts frequency to voltage by taking the average de value of the pulses from the 7 4121 monostable multivibrator. The one shot is triggered by t...
Smeter – Circuit Schematic
Smeter
This design is for an external signal strength meter that is analog, digital, and audible for mobile transmitter hunters. The S meter also incorporates a gain ...
Line-current-monitor – Circuit Schematic
Line-current-monitor
A low-cost filament transformer provides a linear indication of the load current in an ac line. ...
Motor-hour-meter – Circuit Schematic
Motor-hour-meter
In this application, the ICM7249 is configured as an hours-in-use meter and shows how many whole hours of line voltage have been applied. The 20-MD resistor an...
Precision-frequency-counter-tachometer – Circuit Schematic
Precision-frequency-counter-tachometer
In this configuration, the display reads hertz directly. With pin 11 of the ICM7027 A connected to V00, the gating time will be 0.1 second; this will display t...
Picoammeter-circuit – Circuit Schematic
Picoammeter-circuit
This circuit uses the exceptionally low input current 0.1 pA of the CA3420 BiMOS op amp. With only a single 10-MO resistor, ...
Very-short-pulse-width-measurer – Circuit Schematic
Very-short-pulse-width-measurer
This circuit operates by charging a small capacitor from a constant-current source when the pulse to be measured is present. Dual pnp transistor Q3 is the curr...
Tachometer-and-direction-of-rotation-circuit – Circuit Schematic
Tachometer-and-direction-of-rotation-circuit
In machine and equipment design. some applications require measurement of both the shaft speed and the direction of rotation. Fig. 56-4 shows the circuit of a ...
Wide-range-rf-power-meter – Circuit Schematic
Wide-range-rf-power-meter
The Hewlett-Packard HSCH-3486 zero-bias Schottky diode is used as the detector. To avoid using a modulation method of detection, a chopperstabilized op amp i...
Duty-cycle-monitor – Circuit Schematic
Duty-cycle-monitor
The circuit monitors and displays a digital signal"s duty cycle and provides accuracy as high as ±1%. Using switch S2, you can choose a frequency range of e...
Current-monitor – Circuit Schematic
Current-monitor
This circuit uses a Hall-effect sensor, consisting of an IC that resides in a small gap in a flux-collector torrid, to measure de current in the range of 0 to ...
Gas-temperature-monitor-detection – Circuit Schematic
Gas-temperature-monitor-detection
This circuit can be used to measure exhaust gas temperature in a furnace. The 10-bit LTC1091A gives 0.5°C resolution over a ooc to 500°C range. The LTC10...
Sensitive-field-strength-meter – Circuit Schematic
Sensitive-field-strength-meter
The two-pole, five-position switch, coils and 365-pF variable capacitor cover a range from 1.5 to 30 MHz. The amplifier uses Darlington npn transistors whose h...
Digital-peak-detector – Circuit Schematic
Digital-peak-detector
The peak detector tracks and holds, using the charge-storing ability of a capacitor, the highest output voltage from a transducer. Initially, the voltage on th...
Analog-peak-detector-with-digital-hold – Circuit Schematic
Analog-peak-detector-with-digital-hold
Analog peak detection is accomplished hy repeatedly measuring the input signal with an a/d converter and comparing the current reading with the previous readin...
1.2Ghz-frequency-counter – Circuit Schematic
1.2Ghz-frequency-counter
The output of the CA3179 is fed through the Dl!Q1 circuit. Those components serve to boost the 1-V output of the CA3179 to a standard TTL level. Then, dependin...
Frequency-counter-preamp – Circuit Schematic
Frequency-counter-preamp
By using the preamplifier with a short length of shielded cable and clip leads, signals that generally could not generate a readout, generate precise and stabl...