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RTD thermometer – Circuit Schematic
RTD thermometer
This thermometer is capable of 0.01°C accuracy over - 50°C to +150°C. A unique trim arrangement eliminates cumbersome trim interactions so that zero ga...
Dual over-under temperature monitor – Circuit Schematic
Dual over-under temperature monitor
This circuit is ideal for use as an over-under temperature monitor, where its dual output feature can be used to drive HIGH and LOW temperature-indicator lamps,...
Heater temperature controller – Circuit Schematic
Heater temperature controller
The circuit can control up to 6 kW of heating, with moderate gain, using a 25-amp triac (SC260D). Feedback is provided by the negative temperature co-efficient ...
Precision RTD signal conditioner – Circuit Schematic
Precision RTD signal conditioner
The circuit provides complete, linearized signal conditioning for a platinum RTD. This LTC1043 based circuit is considerably simpler than instrumentation or mul...
Temperature control – Circuit Schematic
Temperature control
A couple of transistors and a thermistor in the charging network of the 555 type timer enable this device to sense temperature ^nd produce a corresponding frequ...
Temperature-controlling circuit – Circuit Schematic
Temperature-controlling circuit
The circuit switches the current to an electrical heater on and off to maintain the temperature of a room at 25 ±0.5°C. The temperature sensor is a thermi...
Circuit monitors blinking phone lights – Circuit Schematic
Circuit monitors blinking phone lights
A 2N5777 photo-Darlington cell picks up blinking light from the transparent plastic buttons. The power is switched ON and OFF by a hi-beta 2N3904 transistor. Th...
Vox box – Circuit Schematic
Vox box
The electronic circuit in the VOX Box consists of three parts: a microphone preamplifier, a Schmitt trigger, and a relay driver. Input signals (MIC INPUT termin...
Photomultiplier output-gating circuit – Circuit Schematic
Photomultiplier output-gating circuit
The application involves observing the light pulse emerging from a thick specimen after transillumination by a laser pulse. Pulses derived from the laser source...
Micropower radioactive radiation detector – Circuit Schematic
Micropower radioactive radiation detector
In the absence of radiation, no current is drawn. At normal background radiation levels the power consumption is extremely low. The instrument may be left on fo...
Contrast meter – Circuit Schematic
Contrast meter
One leg of the photocell (Rl) is tied to the +15 volt supply and the other end is connected to ground through resistor R2, forming a voltage-divider network. Th...
Shutter-speed tester – Circuit Schematic
Shutter-speed tester
The solar cell is connected across the input of the FET (field-effect transistor), Ql, so that it will produce positive dc voltage to the gate when activated by...
Phase-sequence detector II – Circuit Schematic
Phase-sequence detector II
This circuit derives its supply voltage, Vcc and Vdd from ...
Phase sequence detector – Circuit Schematic
Phase sequence detector
This circuit prevents damage to the load due to incorrect phasing. The three power SSR's are only permitted to turn-on for a phase sequence of phase A leading p...
Phase reversal detector – Circuit Schematic
Phase reversal detector
Assume the correct phase sequence to be VA-VB-VC. The circuit terminals are connected such that Tl gets connected to phase A and T2 to phase B. The capacitor ad...
Dc linear coupler – Circuit Schematic
Dc linear coupler
The accuracy of direct linear coupling of analog current signals via an optocoupler is determined by the coupler linearity and its temperature coefficient. Use ...
Stable optocoupler – Circuit Schematic
Stable optocoupler
A circuit stabilizes the current-transfer ratio (CTR) of an optically coupled isolator used as a linear transducer. The optocoupler produces a voltage output th...
Heart rate monitor – Circuit Schematic
Heart rate monitor
Light filtering through the finger tip is detected by the cadmium sulphide photoresistor CD1 which forms the feedback network for transducer amplifier section I...
Unidirectional motion sensor – Circuit Schematic
Unidirectional motion sensor
This circuit detects an object passing in one direction but ignores it going the opposite way. Two sensors define the sense of direction. The object blocks the ...
Wire tracer – Circuit Schematic
Wire tracer
The tracer detects the weak magnetic field of any current-carrying house wiring and amplifies this signal to a level that is adequate for driving a magnetic ear...