Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
Metal Detector Circuits
Liquid Sensing Circuits
Light Sensing Circuits
Voltage Detector Circuits
Air-Gas Detection Circuits
Human Sensing Circuits
RF & Radiation
Optical Sensing Circuits
Free Energy Circuits
AC to DC & DC to DC
Solar Cell Circuits
Micro Power Circuits
Switching Power Supplies
Light Laser LED
Digital to Analog
Analog to Digital
Data Bus Circuits
Voltage to Pulse
Current to Voltage
Frequency to Voltage
RF Converter Circuits
Sine to Square Wave
Voltage to Current
voltage to frequency
Period to Voltage
Video Wall circuits
TV Video Circuits
Motor Control Circuits
8051 / 8052
PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
6 Band resistor
Meter Counter Circuits
Thermostat with three-wire serial interface smart temperature sensor DS1620 configuration control circuit
DS1620 with a microprocessor to monitor temperature, by opening or closing the fan can be changed thermal conditions of the chip to achieve temperature control circuit as shown
FGDF-3 three-phase low-temperature iron plating main circuit
FGDF-3 three-phase low-temperature iron plating main circuit KGDF-3 low-temperature iron plating power supply device having a single-phase low-temperature iron plating all the
Electronic thermometer circuit
Electronic thermometers as shown in the circuit. RT is the thermistor, A is an integrated operational amplifier. VD1 ~ VD4 composition marked by the scribe mushroom flow channe
Three temperature switch circuits
Electronic temperature control circuit on an imported car air conditioners. Operational amplifier Ai, A2 using LM393. Adjustment potentiometer RP. Temperature range can be chan
OP27 multiple S-type thermocouple circuit
Electronic switch selection, you can achieve multiple temperature control, or a plurality of temperature monitoring points, monitoring. OP27 multiple S-type thermocouple circui
TC621 temperature sensor using poultry hatchery electronic thermostat control circuit diagram
Eggs hatch chicks temperature requirements within 36 ~ 39oC temperature range, temperature sensor integrated circuits using TC621 temperature control circuit, having fewer exte
Dispenser Aucma temperature detection control circuit
Dispenser (Aucma) temperature detection control circuit It shows the dispenser (Aucma) temperature detection control circuit. The dispenser is composed of two parts, one part i
Electric thermos temperature detection control circuit
Electric thermos temperature detection control circuit Electric thermos shows the temperature detection control circuit. It is mainly by the control circuit of the boiler heate
SCR furnace temperature regulating circuit
Consisting of two differential amplifier transistors voltage dividing type bias circuit, and this resistance is measured four bridge four of arm. Wherein the product is a plati
The CD4069 or 74C04 hex inverterâ€”is used as^ fixed-frequency oscillator centered around 100 kHz. U2 contains the variable frequency oscillator and balanced modulator. The CD4046 is a phase-locked loop and R3, R4, and C2 determine the center frequency of the on-chip oscillator. The antenna forms a parallel capacitance with C2, which allows the...
Temperature measurement using two cables
In those cases we want to measure the temperature in an area far from where it is. The imaging unit installed, you should find some way to connect the latter with the necessary sensor. The cables we use most often will have three two conductors for power sensor and one more to carry the signal representing the temperature. But it may have only...
This thermometer is capable of 0.01Â°C accuracy over - 50Â°C to +150Â°C. A unique trim arrangement eliminates cumbersome trim interactions so that zero gain, and nonlinearity correction can be trimmed in one even trip. Extra op amps provide full Kelvin sensing on the sensor without adding drift and offset terms found in other designs. Al is...
TCA965 window discriminator IC allows the potentiometers RVl and RV2 to set up a window height and window width respectively. Rl and thermistor THl for a potential divider connected across the supply lines. Rl is chosen such that at ambient temperature the voltage at the junction of these two components will be approximately half supply. As the...
The circuit exploits the fact that when fed from a constant current source, the forward voltage of a silicon diode varies with temperature in a reasonably linear way. Diode Dl and resistor R2 form a potential divider fed from the constant current source. As the temperature rises, the forward voltage of Dl falls tending to turn Ql off. The output...
This design measures the differential temperature between two sensors. Sensor Tl, located before the heater resistor, assumes the fluid"s temperature before it is heated by the resistor. Sensor TZ picks up the temperature rise induced into the fluid by the resistor"s heating. The sensor"s difference signal appears at Al"s output. A2 amplifies...
Filtered 15 V de is applied to a series circuit consisting of thermistor R2 and parallel combination of resistors Rl and R3. Transistor Ql acts as a switch whose state is determined by the setting of potentiometer R3, which is first set so just enough current flows into the base to switch on when the thermistor is in contact with air. When...
This circuit responds quickly enough to prevent damage from most overloads. C 1 "s input is connected to the output of the LT1088 servo circuit. If the LT1088 circuit"s output exceeds the threshold at Cl"s other input, C1 trips, discharging the 2-!"F capacitor. This causes C2"s output to become low, energize the relay, and break the heater...
When power is applied, the thermistor, a negative tc device, is at a high value. A1 saturates positive. This forces the LT3525A switching regulator"s output low, biasing Ql. As the heater warms, the thermistor"s value decreases. When itsinputs finally balance, A1 comes out of saturation and the LT3525A pulsewidth modulates the heater via Q1,...
Sensing element Ql is a 2N3904 general-purpose npn transistor, although any general-purpose npn unit in a T0-92 style case will do. IC1, an LM334, supplies Ql with a constant current that is independent of temperature. An LM324 quad op amp, IC2, forms a high input-impedance differential amplifier (IC2a, IC2b, and IC2c) with a gain of about...
To decouple the sensors from the meter amplifier, either a reference junction at ooc or a bucking voltage set at room temperature may be used. The latter method is simpler, but is sensitive to changes in ambient temperature.
The temperature sensor provides an input to pin 3 of the NE5037 of 32 mV/Â°C. This 32 mV is the value of one LSB for the NE5037. The LM334 is a three-terminal temperature sensor and provides a current of 1 p.A for each degree Kelvin. The 32-KO resistor provides the 32 mV for each microamp through it, while the transistor bleeds off 273 p.A of...
This circuit uses the +5 V reference output and the op amp to level shift and amplify the 2.1 mV/Â°C Tempco output into a voltage signal dependent on the ambient temperature. Different scaling can be obtained by selecting appropriate resistors from the table giving output slopes calibrated in degrees Celsius or degrees Fahrenheit. To...
A simple op amp and silicon diode are the heart of the temperature-to-voltage converter that will permit you to use an ordinary voltmeter-either analog or digital-to measure temperature. User adjustments make it possible for a reading of either 10 mV or 100 mV to represent 1 Â°F or C. Temperature sensor D1 is a 1N4148 silicon diode. It has a...
Thermocouple Temperature Control
This control, with zero-voltage load switching, uses a CA3130 BiMOS op amp and a CA3079 zero-voltage switc
A thermistor (RI) is compared with a reference (R2) in a Wheatstone-bridge circuit. Comparator Ul"s output goes high
Simple Temperature Indicator
For the absolute measurement of temperatures, a thermometer is indispensable. However, in many situations, an
The reference current is fed from the supply voltage via Rl, to the inverting terminal, and the variable (noninver
The AD537 uses its two reference outputsâ€”one fixed at 1 V, the other of which varies with temperature (1 mV per Â°K). At
The output goes high when a preset temperature is exceeded. A fixed half-supply reference voltage feeds a reference
Inexpensive Linear Thermometer
As a sensor in the design of this linear thermometer, the LM34 is used. The output is the difference between
This thermometer is capable of measuring temperatures from - 30 to +120 Â°F. A diode-connected 2N3904 transistor form
This circuit combines a current source and a platinum RTD bridge to form a complete high-accuracy thermometer. Th
Frequency Meter Circuits
VU Meter Circuits
255W Valve RF Transmitter circuit
This transmitter of 255W is depended on the coils we put at it to work in both the middle and the short waves. The power in the antenna is 255W and includes 4 states. The first consists of the EF80 that works as a COLLPITS CLAPP oscillator. Frequency selection is done in a somewhat unusual way: Instead of the variable capacitor, it uses a...
Arduino DAC Signal Generator project
Once the circuit gets current, all variables are initialized and the loop function is continually running. Initially all LEDs are off and there is no signal at the output. By pressing the signal switch, the first light that shows the most signal is at the output and the D0-D7 terminals give the appropriate signal which, when passing from the...
Recording circuit of phone conversations using PC
This circuit is used to record telephone conversations on your landline telephone. All you will need is this small circuit and subscription of your PC. There are few times when we forget what we said or told us. So we need recording. Sometime, not many years ago, recording of this kind of conversation was done with a small tape recorder. The...
FM Micro-Transmitter Bug Surveillance Circuit
The transmitter we recommend to build is quite simple. It can even be built by a beginner. However, unlike the ease of construction and its small size, it is almost certain that it will impress you with its outstanding performance. Its autonomy is 12-15 hours, with a 9 volt battery and its range is from 100 to 300 meters depending on the...
Construction of 50Watt 8Ω two-way Hi-Fi Speakers
The presented speakers are distinguished for their small dimensions and their extraordinary sound. Our home space is often limited and prohibitive for large speakers. This limitation does not mean that we will stay without high Sound Quality. Its design is simple, low cost and is easy to construct. Speaker types are too many and are designed in...
GSM modem circuit with Wavecom WMOi3
Modems are devices that connect either remote devices to a computer, or two or more computers to each other. Their connection is usually wired. The GSM modem we present is wireless. It can connect two computers, a computer with the internet or even be the central unit for a data acquisition system. Generally the construction is a GSM phone...
1W UHF Linear Amplifier with BLW33
This circuit is an amplifier for small transmitters operating in the UHF band, specifically in the 450-800MHz range. The amplifier works in class A and we used the well-known Philips BLW33 transistor for its manufacture. The construction, although simple, can be said to be quite critical due to the high frequency singularity. To achieve this, a...
8W Amplifier with TDA2003 circuit
Many times a small amplifier is needed to meet the needs of small spaces. This amplifier can be either mono or stereo, with this circuitry you can comfortably drive two small speakers. To build the amplifier you do not need anything but a few materials and a small power supply. The power of the amplifier, although low power, will solve many...
FM Linear Amplifier 400mW
This amplifier is intended for amplifying low signals from oscillators in the FM band. It does not have frequency regulators with variable capacitors and coils, it has a wide range and moderate power capable of driving several linear amplifiers. The whole construction is based on the two low-power 2N4427 transistors, which are designed for the...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial
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