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GEIGER COUNTER – Circuit Schematic
GEIGER COUNTER
The Geiger tube needs a high voltage sup-ply which consists of Q1 and its associated components. The transformer is connected in reverse; the secondary is conne...
dc VOLTMETER – Circuit Schematic
dc VOLTMETER
A wide-range voltmeter circuit. This inverting amplifier has a gain varying from -30 for the 10-mV full-scale range to -0. 003 for the 100-V full-scale range. D...
Micropower thermometer – Circuit Schematic
Micropower thermometer
The output of this circuit is a current proportional to temperature, which can be used to drive a meter for a direct readout. Alternatively, a resistor or op am...
PRECISION AC VOLTMETER – Circuit Schematic
PRECISION AC VOLTMETER
Measures a-c voltages between 95 and 135 v with 0. 6% accuracy while using ordinary 2% accuracy meter. Zener diodes provide reference voltage. -D. S. Belanger, ...
RF VOLTMETER – Circuit Schematic
RF VOLTMETER
Circuit generates low-frequency waveform whose amplitude is equivalent to that of unknown r-f voltage, using photochopper modulator VI-V2 as error detector. Arr...
PEAK VOLTMETER FOR NARROW PULSES – Circuit Schematic
PEAK VOLTMETER FOR NARROW PULSES
Addition of dual-triode amplifier V2 to conventional peak voltmeter reduces charging time constant while increasing available time for measuring peak value. Lin...
SING AROUND COUNTER CONTROL – Circuit Schematic
SING AROUND COUNTER CONTROL
Timer start-pulse generator is fast series-transistor coincidence circuit. Slop-gate generator is one-shot mvbr that prevents 1N97A diode from passing blocking ...
WATER DEPTH TELEMETER – Circuit Schematic
WATER DEPTH TELEMETER
Determines exact depth of trawl net under water, for interception of desired school of fish. Continuous depth information is transmitted to trawler by modulated...
Linearized platinum resistance thermometer – Circuit Schematic
Linearized platinum resistance thermometer
With the values shown, this circuit has a ±0. 025 °C accuracy over 0 ° to 100 °C. The input offset voltage of the LT-1001, and its drift with temperature, a...
Precision frequency counter tachometer – Circuit Schematic
Precision frequency counter tachometer
Precision frequency counter/tachometer. The ICM7207A provides a 1-second gating window and the store and reset signals. The display reads hertz directly. With p...
Inexpensive frequency counter tachometer – Circuit Schematic
Inexpensive frequency counter tachometer
Inexpensive frequency counter/tachometer. This circuit uses a 556 dual timer to generate the gating, not-store and not-reset signals for a ICM7217 counter. One ...
100 MHz frequency and period counter using the Intersil ICM7226B 40 pin DIP – Circuit Schematic
100 MHz frequency and period counter using the Intersil ICM7226B 40 pin DIP
100 MHz frequency and period counter using the Intersil ICM7226B 40-pin DIP. This circuit uses a CD4016 analog multiplexor to multiplex the digital outputs back...
Precision frequency counter – Circuit Schematic
Precision frequency counter
This circuit shows a simple 4-digit frequency counter using an ICM7217 and an ICM7207 (which provides the 1-s gating window and the STORE and RESET signals). Th...
Digital centigrade thermometer – Circuit Schematic
Digital centigrade thermometer
This circuit shows an ICL7106 connected with a silicon transistor to form a digital thermometer. Direct connections between the ICL7106 and an LCD display are s...
pH METER – Circuit Schematic
pH METER
Beckman model W industrial-type pH meter is d-c amplifier designed for measuring potentials generated by pH-sensitive electrodes. Output will drive most recorde...
SOUND LEVEL METER – Circuit Schematic
SOUND LEVEL METER
Power for the circuit is provided by B1, a 9-V battery. Total battery current is 14. 5 mA, so an alkaline battery should last about 250 hours. Audio signals are...
SIMPLE HARMONIC DISTORTION ANALYZER – Circuit Schematic
SIMPLE HARMONIC DISTORTION ANALYZER
This THD circuit is somewhat different from the usual types: it can operate at the standard fre-quency of 1000 Hz, but it also is tunable from 970 Hz to 1030 Hz...
Simulator Test Tools Speed Circuit Design – Circuit Schematic
Simulator Test Tools Speed Circuit Design
A zero-crossing detector would convert an input sine wave (Vin) to a square wave, which when high would charge an op-amp integrator. Subsequently, a reference-i...
Linearize measurements from bridge circuits – Circuit Schematic
Linearize measurements from bridge circuits
Bridge circuits have long been popular for conditioning signals from resistive sensors. These circuits are sensitive to small changes in resistance, and they pr...
Inductance and Capacitance Meter Adapter – Circuit Schematic
Inductance and Capacitance Meter Adapter
Another project started with three others not finished. What would my Dad say Well one thing he would say is, "Warn people that this project is under constructi...