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Volume unit meter spans 60 DB dynamic range - 11/10/05 EDN Design Ideas: An audio volume-unit meter displays peak-related audio amplitudes to aid in accurately setting recording levels or for displaying an amplifier's operating conditions. A simple diode and capacitor network provide as a classic volume-unit meter's peak-weighted response, but the circuit typically limits response to about 23 dB of displayable dynamic range, and the meter suffers from errors that its pointer's inertia and mechanical "ballistics" introduce. Contemporary displays eliminate the inertia problem by using arrays of lighted elements to form bar graphs, but any shortcomings in response and accuracy characteristics now shift to the signal-processing domain. Design by Jon Munson, Linear Technology Corp, Sunnyvale, CA VU & PPM Audio Metering - A versatile and useful VU meter circuit, can also operate as a Peak Program Meter __ Designed by Rod Elliott ESP VU Meter - This simple VU Meter may be used in variety of projects. Since real electro magnetic type VU Meters are no longer available or too expensive, I decided to make this one using LM3914 and 10 LEDs, which I can use in my other projects __ Designed by Nina Gajjar
VU Meter - 5 LED VU meter, in PDF format, includes circuit board, text in Finnish__
VU Meter - A very simple circuit of indication of level, with 10 Led. is used the circuit of half-wave rectification of precision round the IC 2, with gain one. With switch S1, we can select the indication of Led. The level of entry is 60 mV-1.25 V__
VU/Peak Meter with LCD Bargraphs - This easy-to-build bargraph VU meter makes it easy to record audio signals at the correct level. it shows both the average signal and peak levels in stereo on an LCD and you can adjust both the display range and number of steps. A digital display option is also available.__ SiliconChip Water_Heater_Flame_Detector - Design a device that detected whether the gas flame of the heater was off or on - whether it was heating water or not - and convey that information to the bathroom. With a readout in the bathroom, one would know if there were enough hot water to take a shower. A battery powered circuit would be best for his situation. The flame detector circuit could be connected to a battery powered LED flasher circuit. The actual LED could be mounted next to the thermostat, using the same wire pathway as the furnace thermostat wires, located nearby. A remote flashing LED would change color from green to red, whenever the flame was on. . . . Dave Johnson, Lubbock TX-DC Magazine - 3rd Q 2012Wart Zapper - The Wart Zapper uses a single CMOS
7555 oscillator (IC 1) , for dual purposes, as follows: First, it pumps up a standard voltage tripler circuit, represented by the capacitor-diode network to the right of IC 1 in the circuit diagram. This takes the voltage up to about 25V, if not a little more. The purpose of increasing __ Designed by Rev. Thomas Scarborough
Watchdog Timer set for 36 Hrs - A watchdog timer is often used in computer systems to detect when a computer is hung up and is no longer running properly. if it does become locked up and is not able to supply a reset pulse to the circuit within a defined time frame the timer times out a . . . Hobby Circuit designed by David A. Johnson P.E.-April, 2010
Watchdog-reset catcher aids embedded-system Debugging - 11/19/98 EDN Design Ideas: NOTE: Multiple circuits included. Scroll to find this one. A simple "junk-box" circuit uses a 4013 CMOS
flip-flop and a handful of passive components to determine whether random resets are the result of a blown stack or the result of the watchdog-reset circuit tripping (Figure 1). You can also use this circuit to "grab" and hold Design by Scott Newell, PCSI, Fort Smith, AR
Water & vandal-proof keypad uses piezoelectric disc as sensor & buzzer - 04/21/14 EDN Design Ideas: An ingenious and low-cost method to create a rugged “Ui”. This design was done to get a sealed keypad for very wet environments (in my particular case, showers for swimming pools). The keypad needed to be able to detect slight pressure on a stainless steel plate 0.4mm thick. Apart from water protection, the solution offers an esthetical finish, as the user side is absolutely flat, with nothing visible other than the silkscreened print. Another advantage of this type of keypad is that it is vandal-proof Design by Francesc Casanellas
Water Activated Alarm - The circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will have no bias current and be fully off. As the probes get wet, a small current flows between base and emitter and the transistor switches on. A larger current flows in the collector circuit enabling the 555 osillator to sound __ Designed by Tom
Water Activated Relay - in his circuit Marin has used two transistors wired as a high gain compound pair. Transistor T1 may be a 2N2222A and T2 a BC108. The current gain will be the product of each transistors beta, which will be a minimum of 140 x 110 or 15400. The power supply used can be any voltage from 4.5 to 15 volts, __ Designed by Marin Lukas
Water Alarm - The LM1830 fluid detector IC from National Semiconductor is designed to be able to detect the presence of fluids using a probe. This chip requires a relatively high supply voltage and is not the most frugal power consumer. it is also quite specialised so unless you are buying in bulk the one-off price is not cheap must register on this site __ Designed by Elecktor July/Aug, 2010
Water Cistern Level Alarm - I received an unusual request from a Discover Circuits visitor a while back. The guy had a deep water cistern which has to be filled when nearly empty. The cistern was described as a deep cylindrical tube, holding 1000s of gallons of drinking water. Periodically, the cistern is filled from a tanker truck, when the water inside reached a critical level. The guy wanted a simple circuit he could build which would flash an LED when the water level reached a certain depth. That flasher would tell him it was time to order more water. . . Circuit by David A. Johnson P.E.-April, 2014
Water Filling Station Controller - This circuit was requested by a company needing a simple way to fill a large tank with water with little fuss. They wanted a low tech method to automatically fill the tank with water without constant monitoring. They wanted to press a single pushbutton switch and then walk away. in their application, the water tank is first filled to a certain level. The fixed volume of water is then slowly drained off into a second tank, where the water is mixed with another material. The empty tank is then ready to be filled again, for another cycle. . . . Hobby Circuit designed by Dave Johnson P.E.-April, 2011
Water Flowing in Pipe Indicator - The vibrations associated with water flowing through a pipe are picked up by an inexpensive piezoelectric wafer. The signal from the wafer is first boosted by a micropower transistor amplifier and then fed to an ultra low power voltage comparator. When the vibration signal has sufficient amplitude, a FET transistor switch is activated…[Circuit designed by Dave Johnson P. E. , 6/06/2009]. . . Circuit by David Johnson P.E.-July, 2009
Water Level Alarm - A circuit that offers visual indication of fluid level in a vessel, with a switchable audible alarm. Example uses would be to monitor the level of water in a bath or cold storage tank. __ Designed by Andy Collison
Water Level Control/Monitor - A simple way to control the level of any liquid in any container. __ Designed by Jose Pino
Water Level Controller - Supply your own water pump for this water level controller. __ Contact Jameco Electronics
Water- Level Controller - in most houses, water is first stored in an underground tank (UGT) and from there it is pumped up to the overhead tank (OHT) located on the roof. People generally switch...__ Electronics Projects for You
Water Level Controller-Cum-Motor Protector - Many a time we forget to switch off the motor pushing water into the overhead tank (OHT) in our households. As a result, water keeps overflowing until we notice the overflow...__ Electronics Projects for You
Water Level Detector - Schematic + info + pictures __ Designed by Lennie Zink
Water Level Indicator with Alarm - Here is a simple, versatile circuit which indicates the level of water in a tank. This circuit produces alarm when water level is below the lowest level L1 and also when...__ Electronics Projects for You
Water Level Monitor - This system operates much like a classic float switch but without any moving parts. The illustration shows how a system using two copper coils sealed inside a plastic pipe, can detect the level of water outside the pipe. Whenever the water level is lower . . . Hobby Circuit designed by David Johnson P.E.-July, 2006
Water Pump controlled by Solar Power - A Discover Circuits visitor had a problem. He needed a simple on/off controller for his solar powered water pump. His system used two 12v 50 watt solar panels wired in series. The power from the solar panels drove a submerged water pump. However, during . . . Hobby Circuit designed by David A. Johnson P.E.-October, 2010
Water Pump Hysteresis - A simple circuit to prevent a pump being damaged by being turned on and off rapidly (multiswitching). __ Designed by REUK-Renewable Energy UK website
Water Seepage Alarm - This simple circuit sounds a beeper when its electrodes detect water. it is powered by a single 1.5v N cell. A small 1.5v button battery will also work . . . Hobby Circuit designed by David Johnson P.E.-June, 2000
Water Seepage Monitor - A while back I received a request from a company who needed a water seepage detector. They wanted a device that ran on 24vac and detected water using a fully isolated circuit. They wanted a circuit which switched off 24vac to a load when water was detected. . . Circuit by David Johnson P.E.-January, 2011
Water Sensor Alarm - This small water sensor alarm circuit makes a loud warning sound when a humidity sensor detects a quantity of water. This circuit assembly is an application of low power comparator LM1801 made by National Semiconductor. The reference voltage for the integrated circuit is fixed with the help of R2. When pin 4 of the LM1801 __ Designed by Popescu Marian
Water Tank Controller - Frequency Counter project detailed here is based on PIC 18F4550 for which design and firmware/software support is given by Fox Delta Team. There are many PIC based frequency counters out there but this one will stand apart from others. __ Designed by Nina Gajjar
Water Tank Level Meter, Pt.3: the Base Station - Designed to team with up to 10 Water Tank Level Meters, this Base Station lets you monitor water levels from a remote location (eg, inside your home). As a bonus, it also includes an option for electric pump control.__ SiliconChip
Water-Leak Detector Uses 9V Batteries - 05/27/10 EDN-Design ideasThe design uses Maxim integrated Circuits ' MAX934, an ultra-low-power quad comparator with a built-in 1.2V reference. The chip uses about 6 μA. IC 1A , R 1 , and R 2 provide water-leakage detection. R 1 is the water probe, which can be two bare copper wires wrapped in a sponge. R 1 has high impedance when the sponge is dry, so IC 1A 's output stays high Design by Yongping Xia, Navcom Technology, Torrance, CA
Water-level Alert - This circuit will emit an intermittent beep (or will flash a LED) when the water contained into a recipient has reached the desired level. it should be mounted on top of the recipient (e.g. a plastic tank) by means of two crocodile clips, acting also as probes. if a deeper sensing level is needed, the clips can be extended by means of two pieces of stiff wire (see pictures). __ Contact Flavio Dellepiane, fladello @ tin.it
Water-Level Controller - Here is a simple, automatic water level controller for overhead tanks that switches on/off the pump motor when water in the tank goes below/above the minimum/maximum level. The water level is...__ Electronics Projects for You
Water-Level Indicator - Many a time we forget to switch off the motor pushing water into the overhead tank (OHT) in our households. As a result, water keeps overflowing until we notice the overflow...__ Electronics Projects for You
Water-level Indicator - Simple, two-wire, remote monitoring unit; Three-LED level display, 9V battery powered __ Contact Flavio Dellepiane, fladello @ tin.it
Water-Level Indicator using 7-Segment Display - This water-level indicator uses a 7-segment display, instead of LEDs, to indicate the water level (low, half and full) in the tank. Moreover, a buzzer is used to alert you of...__ Electronics Projects for You
Water-level Sensing & Control - This is a simple but reliable circuit for your sump-pump, aquarium, boat, or whatever, but water only. Please be careful when working with 115Volt line voltage! Take every precaution to avoid electrical shock. Unplug the power before making changes or touching resistor R1. Murphy's Law applies to all of us! . __ Designed by Tony van Roon VA3AVR
Waterman S-10-A Pocketscope oscilloscope schematic - Circuit Only __ Designed by Waterman
Water-Softener Brine-Tank Salt-Level Monitor - if you have hard water, did you ever forget to add salt to the water softener tank? This electronic device monitors how full the tank is using a Sharp DP2D12 infrared distance monitor. The results are displayed on a custom wall plate with a multicolor LED bar graph. The project also includes several photosensors to save power. __ Contact David Cook
Water-Tank Overflow Indicator - Water is a vital but scarce natural resource. To prevent water wastage, this water-tank overflow indicator comes in handy. it gives audio as well visual alarm whenever the water tank overflows.Fig....__ Electronics Projects for You
Watt Meter Measures True RMS Watts - This circuit will give you a good, Accurate Watt Meter that can measure various power levels.
in the Origional Article the Shunt was a .001 Ohm Copper Shunt giving a 1000 Watt Scale. However, because Most Circuit Breakers in homes are 15 Amps, I made my unit to have a range of Zero to 1500 Watts. __ Designed by G.L. Chemelec
Watt-Hour Meter Monitor - Have you ever wondered how much power your house or apartment is using? Most watt-hour meters are like the one shown below. Some newer ones have a digital display but there millions of these older models still in use . . . Hobby Circuit designed by David Johnson P.E.-September, 2008
Wattmeter - The extra input B is for a later SWR brigde project, also the TX serial output will be in use later. The uncalibrated signal response is: +1/-1 dB from 1MHz to 450MHz. input SWR vill varry from 1.00 to 1.30, depending on input frequency. To make the SWR this good, you need to assemble the input circuit correct and adjust the capasitor. input power range: -60 to +30dBm that is 1 nW to 1 Watt. __
WATTMETER (uses DVM for display) - This is a pretty good half wave wattmeter that display true watts. its output is a DVM floating on the power line, so be careful! __ Designed by Dick Cappels
Waveform Generator provides Flexible Frequency tuning for Sensor Measurement - 12/17/04 EDN Design Ideas: Variable-resistance sensors convert a fixed dc excitation voltage or current into a current or voltage that's a straightforward function of the quantity undergoing measurement. in another class of sensors, moving objects or fluids p Design by Colm Slattery Analog Devices, Limerick, Ireland
Waveform Monitor with LCD - The result was a project that includes a waveform capture circuit, a graphic LCD (Liquid Crystal Display) and a control panel with LED indicators. The details of the Graphic LCD display unit, composed of the LCD module, a serial interface, and bias supply were published earlier on this site, __ Designed by Dick Cappels |
