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Diode Clamp Voltage
What is the best voltage limitation method before feeding an analog digital converter?
An analog amplifier circuit (gain = 25) is followed by level shifter (gain = 0.5, offset = 2.5V). The level shifter feeds an ADC with an input range of 0 to 5V. Between the level shifter and the ADC input there are 5V zener and clamping diodes with appropriate current limiting resistors in between. However the input voltage to the ADC still exceeds the range by the forward voltage of clamping diodes (i.e: -0.7 to 5.7V). Especially for negative voltages this causes the ADC to return erroneous values for other inputs using the same internal S&H circuit. What is the best way to achieve true voltage limiting without adding specialized IC's that may become obsolete in a few years?
One solution is to add accurate comparators to sense that the input voltage is below zero volts and above 5 volts and then send alarm data bits back to the processor that handles the data. But the comparators have to be adjusted to be more accurate than the AD.
Another solution is a better AD, or one that returns recognizable codes when the input is out of range. The processor than can see those codes and set appropriate flags.
Another is a precision clamp, reference has example. But the problem with this (and your solution) is that the processor will read an out of range voltage as an in-range voltage, which could be an error.
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Voltage Doubler $54.86 High Quality Content by WIKIPEDIA articles A voltage doubler is an electric circuit with an AC input and a DC output of roughly twice the peak input voltage. They are a variety of voltage multiplier circuit and are often, but not always, a single stage of a general form of such circuits. The term is usually applied to circuits consisting of rectifying diodes and capacitors only, other means of doubling voltages are not included.The Villard circuit consists simply of a capacitor and a diode. While it has the great benefit of simplicity, its output has very poor ripple characteristics. Essentially, the circuit is a diode clamp circuit. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 68 Publication Date: 2010/07/14 Language: English Dimensions: 6.00 x 9.00 x 0.16 inches |
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1.5' LCD Handheld Auto-Range Digital Clamp Multimeter (Voltage + Current + Resistance / 3*AAA) $31.5 - Clam shaped design- Features 1.5" LCD display with backlit- Auto/Manual range- Maximum value hold, data hold, SMT application- It measures AC/DC voltage, resistance, diode check, transistor hFE test and etc- Display: maximum reading 1999- DC voltage: 200mV~600V- AC voltage: 2V~600V- AC current: 2A~600A- Resistance: 200O~20MO- Powered by 3*AAA battery (included)- Package included:- 1 * Digital clamp meter- 1 * Pair of test leads- 1 * Soft carrying bag- 1 * Chinese user manual |
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Transmission Lines and Schottky Diode $108.33 A nonlinear relation between current and voltage for schottky resonant tunneling diode is used. A general form of equation similar to VanDer Pol equation is obtained. A Resonant tunneling diode(RTD) has a negative differential resistance that means when the voltage increases the current decreases. This property is very useful for oscillators manufacture. Nonlinear transmission lines is considered to show that it canbe used in oscillators and to show that it can reshape the sinusoidal signals to othershapes by using OrCad and mathematica programming. Author: ElKhozondar, Hala J./ ElKhozondar, Rifa J./ Abo Ireban, Ibtisam Binding Type: Paperback Number of Pages: 80 Publication Date: 2011/07/12 Language: English Dimensions: 9.02 x 5.98 x 0.19 inches |
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IDEAL 61-702 200 Amp Clamp Meter $159.99 Features: Non-contact Shaker mode to verify AC voltage Clean power indicator Capacitance Cat III - 1000V rated 200A Current capability Audible continuity Diode Test Data hold/max hold Low battery indicator Overload protection on all ranges Silicone leads Audible dangerous voltage warning Sleep mode Ergonomic hourglass shape Compact head design Parts: 1 year limited Labor: 1 year limited |
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Edelbrock Map Sensor Voltage Clamp for Honda - 15022 $114.99 Includes attached wiring and splice connectors. In the early days of the automotive performance industry, you either ran what was available or you fabricated something you thought met your needs. Such needs were the building blocks of this industry, and it was through the efforts of many that we have the automotive aftermarket, but it was through the work of one name in particular to which many in the industry owe a great debt, and that name is Edelbrock.Product Features:MAP Sensor Voltage Clamp. Most Superchargers and Turbos products are available for in-store pickup from Advance Auto Parts. |
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3 1/2 Digital Clamp Meter (Black) $12.69 - Fashionable design, top quality and portable. - High accurate & superior reliable digital multi-meter on the market, designed for use by electricians, technicians, serviceman and hobbyists, etc. - 3 1/2 digits LCD with a max. reading of 1999. - AC current function. - AC/DC voltage measurement. - Max Display: 1999 auto polarity display - Measure Method: Double integral A/D switch implement - Sampling Speed: 2 times per second - Over-load Indication:"1" is displayed - Operating Environment: 0¡ãC~40¡ãC, under |
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Pyle PCMT20 Digital ACDC AutoRanging Clamp Meter $62.65 Measures AC and DC. Max. Resolution to Current Measurement: 0.1uA. LCD Display with Backlight. Data Hold Zero Function Auto Power Off. Lower Battery Indiactor. 0.9 (23mm) Jaw Size. DC Voltage: Range: 0600 V Accuracy: +/ 0.5. AC Voltage: Range: 0600 V Accuracy: +/ 1.5. AC Current: Range: 0400 A Accuracy: +/ 3.0. Resistance: Range: 040 MO Accuracy: +/ 3.0. Temperature: Range: 1000 deg;C / 1832 deg;F Accuracy: +/ 3.0. Capacitance: Range: 100 uF Accuracy: +/ 2.5. Frequency: Range: 150 kHz Accuracy: +/ 1.2. Continuity: Buzzer Sounds at 100O. Diode: Test Current 0.3mA Open Circuit Voltage 1.5V. Batteries: 2 x AAA Included. Accessories Included: Black Bag Test Leads Type K Temperature Probe. Dimensions: 8.07 H x 2.36 W x 1.18 D. Weight: 7.94 oz |
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Patch Clamp $89.22 Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The patch clamp technique is a laboratory technique in electrophysiology that allows the study of single or multiple ion channels in cells. The technique can be applied to a wide variety of cells, but is especially useful in the study of excitable cells such as neurons, cardiomyocytes, muscle fibers and pancreatic beta cells. It can also be applied to the study of bacterial ion channels in specially prepared giant spheroplasts.The patch clamp technique is a refinement of the voltage clamp. Erwin Neher and Bert Sakmann developed the patch clamp in the late 1970s and early 1980s. Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 112 Publication Date: 2011/05/09 Language: English Dimensions: 9.00 x 6.00 x 0.27 inches |
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Digital Multimeter Electronic Tester AC/DC CLAMP Meter $15.79 Overview:This meter can measure AC/DC voltages, AC currents and resistance.It also can be use for diode and continuity test.It is very convenient to measure AC current,just make electric wires cross though the jaw of clamp100% brand new and high qualitySpecification:Package contents:1 x Digital Clamp Multi-meter2 x Test Leads1 x User ManualAC Current: Range 10mA ~ 20A, 100mA ~ 200A, 1A ~ 400AOverload protection: 400A on all rangesAC Voltage: Range 1V ~ 450VOverload protection: 450V AC on all rangesDC Voltage: Range 1V ~ 600VOverload protection: 600V DC / (peak AC) on all rangesDiode Test, Continuty test, Resistance measurements,Transistor P-N junction testContinuity test with buzzer sound while lt; 75 OhmResistance Measurement: 200K Ohm RangeMax display: 1999, Auto polarity displayPower: 2 x AAA 1.5V battery (not included)Cable length: about 80 cmWeight Approx:172.9gSize Approx:13.7 x 5.3 x 2.4 cm |
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PyleHome PDMT08 Compact Digital Multimeter With ACDC Voltage#44; Current#44; Resistance#44; Diode Check#44; Continuity Test $75.39 DoubleMolded Plastic Housing. HighContrast LCD Display. CATIII Rated. Voltage DC: Max Range 600 V Accuracy: +/ 0.5. Voltage AC: Max Range 600 V Accuracy: +/ 1.2. Current DC: Max Range 10 A Accuracy: +/ 2.5. Resistance: 2 MO Accuracy: 0.8. Diode Check. Continuity Test. Accessories Included: Test Leads 9V Battery. Dimensions: 5.91 H x 2.76 W x 1.89 D. |
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Pyle LAN Tester,Multimeter and Diode Tester $110.8 2 in 1 LAN Tester and Multimeter with Voltage, Current, Resistance, Continuity, and Diode Tester Tests Pin Configuration for 10 Base-T, 10 Base-2, RJ45/RJ11, 356A, TIA-569A/568B and Token Ring Cable Remotely Test Cables Up to 330 Yards Away Test Ground Wire Measure DC/AC Voltage, DC/AC Current, Resistance, Continuity, and Diode DC Voltage: Max Range 600 V, Accuracy +/- 0.5% AC Voltage: Max Range 600 V, Accuracy +/- 1.2% DC Current: Max Range 200 mA, Accuracy +/- 1.2% AC Current: Max Range 200 mA, Accuracy +/- 2.0% Resistance: Max Range 20 MO, Accuracy +/- 0.8% Continuity Test: Beeps If Less Than 100 O Accessories Included: Test Leads, LANtest Remote Terminator, 9V Battery, Carrying Case Dimensions: 6.38" H x 2.93" W x 1.73" D Weight: 10.86 oz. |
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Pipe Clamp by WAC Lighting $22.5 The WAC Lighting Pipe Clamp designed to work on pipes enable you to mount lights and get the proper aesthetic view. The Pipe Clamp features dark brown finish. WAC Lighting, founded in 1984, has developed a strong reputation for high quality decorative and task lighting. Based in Garden City, New York, WAC Lighting is a leading manufacturer of low voltage, line voltage and LED lighting, including track systems, transformers, lamps, cabinet lighting and recessed downlights. Shipping: This item usually ships within three- to five business days. Dimensions: Clamp: Diameter Adjustable from .5 In. to 2.5 In. |
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DIODE $12 When these electrical items fail there is little choice but to renew - With this genuine Suzuki par.. |
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PyleHome PLTM20 2 in 1 LAN Tester and Multimeter with Voltage#44; Current#44; Resistance#44; Continuity#44; and Diode Tester $145.59 Tests Pin Configuration for 10 BaseT 10 Base2 RJ45/RJ11 356A TIA569A/568B and Token Ring Cable. Remotely Test Cables Up to 330 Yards Away. Test Ground Wire. Measure DC/AC Voltage DC/AC Current Resistance Continuity and Diode. DC Voltage: Max Range 600 V Accuracy +/ 0.5. AC Voltage: Max Range 600 V Accuracy +/ 1.2. DC Current: Max Range 200 mA Accuracy +/ 1.2. AC Current: Max Range 200 mA Accuracy +/ 2.0. Resistance: Max Range 20 MO Accuracy +/ 0.8. Continuity Test: Beeps If Less Than 100 O. Accessories Included: Test Leads LANtest Remote Terminator 9V Battery Carrying Case. Dimensions: 6.38 H x 2.93 W x 1.73 D. |
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200 Amp AC Clamp Meter $128.99 4-in-1 200 Amp AC clamp meter Measures voltage up to 750VAC / 1000VAC Indicates if harmonics are present and vibrates when voltage is present CAT III 1000V rated Measures capacitance Includes a non-contact voltage tester |
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Auto Range Data Clamp Multimeter $25.39 Overview:This meter can measure AC/DC voltages, AC currents and resistance.It also can be use for diode and continuity test.It is very convenient to measure AC current,just make electric wires cross though the jaw of clampUltra thin and small design Auto powerSpecification:Package contents:1 Clamp Multimeter2 Test LeadsWeight Approx:284.1gSize Approx:18.3 x 9.3 x 3.3 cm |
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Extech EX800 Series Clamp Meter + IR Thermometer
Will a metal bracket interfere with a motor?
Hi, I wasn't sure to place this question in engineering or physics, but it seemed more an electricity & magnetism question.
I am attempting to build a bicycle pedal-powered generator. A bicycle stand's roller will move the DC motor's (aka generator's) shaft. I understand I will need a blocking diode (with a large heat sink) and also a voltage regulator and a pair of 12v batteries (it's a 24v motor)...and lots of fuses in between (I am not taking any chances, but I am enjoying the attempt to build this).
However, I need to support the heavy motor / generator with a bracket. I purchased two 4-inch exhaust U-clamps to hold the motor to the platform, but the brackets have a strong magnetic attraction to the motor. Will this attraction (and the added metal of the bracket) interfere with the motor's electrical generation capabilities?
The motor is a 24volt, 22amp capable of generating a maximum 350 watts, electric scooter motor XyD-6D permanent-magnet motor, 2600rpm. Thanks!
The brackets will have little effect on the generator. They are just being attracted by the stray magnetic field from the permanent field magnets. But few humans are capable of producing 350 watts. 150-200 is likely the best you can do.
You may be better off with a single 12v battery and a 12v regulator. Permanent magnet motors can work as generators, but they're not designed for it, so they're not as efficient.
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