|
|
Category: Inside Circuits Views: 913 Rank: 3 The monitoring circuit consists of four tri-color LEDs driven by an equal number of op amps configured as gain-of-one inverting amplifiers. Each LED is wired in the circuit so that it glows red when the input to the op amp is high, and green when the input is low. The LED remains off when the input is disconnected from a circuit, when it's at ground potential, and when it's connected to a 3-state output that's in the high-impedance state. Each input has an impedance of 10,000 ohms preventing the circuit.  from loading communication lines. The op amp requires both positive and negative supply voltages to properly drive the LEDs. Both voltages are supplied by a single, nine-volt battery. The battery supplies the positive source directly. The negative source is supplied via a CMOS 555 oscillator/timer that's configured as an astable oscillator, which is used to drive a standard diode/capacitor voltage doubler. When the 555 is connected to the monitoring circuit, the output voltage is not 18 volts (2 ? 9), but a little under nine volts, due toioading. The circuit draws about 16 mA with all LEDs off; with all four on, it draws between 20 and 30 mA, depending on how many LEDs are high, and how many are low. The use of CMOS op amps reduces quiescent current drain considerably.
Related circuits Symmetry of the square-wave output is maintained by connecting the right side of R2 through resistor R3 to the output of the third amplifier stage. This changes the charging current to the capacitors in proportion to the setting of frequency-adjusting potentiometer R2. Thus, a duty cycle of 50%... 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. If the output is low, application of a negative-going pulse to the trigger input sets the flip-flop (Q goes low), drives the output high, and turns off 1. Capacitor C is then charged through Ra until the voltage across the capacitor reaches the threshold voltage of the threshold input. If the... 100W 420-450Mhz push-pull linear amplifier This 100 watt linear amplifier may be constructed using two MRF309 transistors in push-pull, requiring only 16 watts drive from 420 to 450 MHz After the first cycle. the relay will normally be energized. When normally closed pushbutton 51 is activated, the SCR turns off, the relay is de-energized, and power is applied to the relaxation oscillator and the load. Mter a time delay varying from less than a second to approximately 2.5... 5-Pole Low-Pass Filter Circuit The LTC1063 is the first monolithic low-pass filter that simultaneously offers outstanding dc and ac performance. It features internal or external clock tunability, cutoff frequencies up to 50 kHz, 1-mV typical output dc offset, and a dynamic range in excess of 12 bits for over a decade of input... Voice Scrambler/Disguiser Circuit This circuit uses two balanced modulators to produce a DSB signal and then reinsert the carrier, except t This circuit is a 10-LED spinning wheel that "clicks" as the wheel passes each point. The rotation starts fast, then gradu CDC Electronic WorkShop - Op-Amp buffer circuiit thing.
Building electronics from schematic diagrams
Comments
Facebook Comments
Most searched
lm3915
Results: 15 Count: 10817
Automatic battery charger
Results: 960 Count: 9298
12v counter
Results: 965 Count: 8083
signal generator using XR2206
Results: 3108 Count: 7474
multivibrator
Results: 243 Count: 7472
12f629 switch
Results: 1604 Count: 7220
optocoupler
Results: 52 Count: 7101
bcd
Results: 40 Count: 6348 |
Accounts area
Circuits
Audio Filters
Stereo Circuits Ultrasonic Circuits Amplifiers Audio Oscillators Preamplifiers Audio Mixers Equalizers Tone Balance Beeper Buzzer Vacuum Tubes Valves Musical & effects Microphone Circuits
PLL Circuits
UHF circuits VHF Circuits FM radio GPS Circuits Jammer Circuits RF Transmitters RF Receivers RF Amplifiers AM radio Antenna Circuits FM Transmitter Transceiver Circuits
Demodulators
Buffer Circuits Triac Circuits Mosfet Circuits Sequencer 555 Timer Circuits Doorbell Circuits Switching Circuits Remote Control Toy H Bridge Circuit Game Circuits Keypad Circuits
Metal Detector Circuits
Liquid Sensing Circuits Light Sensing Circuits Voltage Detector Circuits Air-Gas Detection Circuits Human Sensing Circuits RF & Radiation Medical Circuits Sensor Circuits Magnetic circuits Optical Sensing Circuits Hall Effect
Varius Circuits
Astable Colpitts Crystal Hartley RF Sine wave Square wave Volt controlled Wein Bridge Monostable Circuits Pierce
Tesla Circuits
Inverter Circuits Free Energy Circuits Chargers AC to DC & DC to DC Solar Cell Circuits Current Limiting Mirco Power Circuits High Voltage Switching Power Supplies
Timer Circuits
Voltmeters Frequency meter Meters Circuits Counters Clock Circuits Checker Circuits Delay Circuits Thermometer Circuits VU Meters
Infrared
Xenon Lighting Light Sensing Laser Led circuits Fluorescent Circuits LCD circuits Light Dimmers
Readout Circuits
Logic Circuits Digital to Analog Display Circuits Analog to Digital Data Logging Data Bus Circuits Decoder 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 Mixer
Video Wall circuits TV Video Circuits Modulator Camera Circuits Television Photo Flash Video Amplifier
Stepper Motor
Remote Control Servo Circuits Robotics Direction Finder Power Control Relay Circuits Motor Control Circuits
Arduino projects
PIC Microcontroller AVR Microcontroller Programmers 68HC11 Microcontroller 8051 / 8052 MCU Circuits
|
|
Electronic Circuits Schematics Projects
|
|
