Thermoelectric Cooling Performance
... 3) Why are there differences between the manufacturer’s data and the experimental results for the plots of COP vs T? Speculate about multiple causes. How could the thermocouples be positioned differently to get more accurate results? 4) Some of the T values at low TEC voltages were initially neg ...
... 3) Why are there differences between the manufacturer’s data and the experimental results for the plots of COP vs T? Speculate about multiple causes. How could the thermocouples be positioned differently to get more accurate results? 4) Some of the T values at low TEC voltages were initially neg ...
MAX1708 High-Frequency, High-Power, Low-Noise, Step-Up DC-DC Converter General Description
... (350kHz < fCLK < 1MHz) is applied to CLK. For wireless or noise-sensitive applications, this ensures that switching harmonics are predictable and kept outside the IF frequency band(s). High-frequency operation permits low-magnitude output ripple voltage and minimum inductor and filter capacitor size ...
... (350kHz < fCLK < 1MHz) is applied to CLK. For wireless or noise-sensitive applications, this ensures that switching harmonics are predictable and kept outside the IF frequency band(s). High-frequency operation permits low-magnitude output ripple voltage and minimum inductor and filter capacitor size ...
Ch01 - lmn.pub.ro
... electromotive force e is determined by the internal energy conversion processes and depends on different physical parameters and, generaly, on time – this dependence on time is considered here. The state/ operating equation of the ideal voltage generator is ...
... electromotive force e is determined by the internal energy conversion processes and depends on different physical parameters and, generaly, on time – this dependence on time is considered here. The state/ operating equation of the ideal voltage generator is ...
Power-supply rail rejection
... Secondly, I assume that any rail filtering arrangements will work with constant or increasing effectiveness as frequency increases; this is clearly true for resistor-capacitor (RC) filtering, but is by no means certain for electronic decoupling such as the NFB current-source biasing used in the ...
... Secondly, I assume that any rail filtering arrangements will work with constant or increasing effectiveness as frequency increases; this is clearly true for resistor-capacitor (RC) filtering, but is by no means certain for electronic decoupling such as the NFB current-source biasing used in the ...
Transformer
... •A typical op amp is an integrated device which has 1. Noninverting input 2. Inverting input 3. Two DC power supply leads (positive and negative) 4. An output terminal 5. Some other leads for fine tuning ...
... •A typical op amp is an integrated device which has 1. Noninverting input 2. Inverting input 3. Two DC power supply leads (positive and negative) 4. An output terminal 5. Some other leads for fine tuning ...
Transformer - Electrical engineering
... •A typical op amp is an integrated device which has 1. Noninverting input 2. Inverting input 3. Two DC power supply leads (positive and negative) 4. An output terminal 5. Some other leads for fine tuning ...
... •A typical op amp is an integrated device which has 1. Noninverting input 2. Inverting input 3. Two DC power supply leads (positive and negative) 4. An output terminal 5. Some other leads for fine tuning ...
COMBOLIGHT Remodel Recessed w/ Trim - 120V PAR20 - 1 Light
... C.... Junction Box Junction Box is UL listed for through branch wiring, 6 #12 90º C supply conductors or 60º C for end of run. The fixture is also UL listed as ‘access above ceiling not required’. ...
... C.... Junction Box Junction Box is UL listed for through branch wiring, 6 #12 90º C supply conductors or 60º C for end of run. The fixture is also UL listed as ‘access above ceiling not required’. ...
Measuring vibration using sound level meter Nor140
... Most sound level meters and sound analysers can be used for vibration measurements, even if they do not provide absolute (linear) units in the display. To simplify the description, this application note describes the use of the handheld sound level meter Norsonic Nor140. However, the described princ ...
... Most sound level meters and sound analysers can be used for vibration measurements, even if they do not provide absolute (linear) units in the display. To simplify the description, this application note describes the use of the handheld sound level meter Norsonic Nor140. However, the described princ ...
guitar amplifier
... 2: OVERDRIVE LEVEL: Use this control to increase the output volume and add “crunch” to your sound. This control is only active when the Overdrive Gain control (#3) is turned on. For more information please see the “Getting Your Sound” section on the previous page. 3: OVERDRIVE GAIN: Use this control ...
... 2: OVERDRIVE LEVEL: Use this control to increase the output volume and add “crunch” to your sound. This control is only active when the Overdrive Gain control (#3) is turned on. For more information please see the “Getting Your Sound” section on the previous page. 3: OVERDRIVE GAIN: Use this control ...
permanent-magnet moving-coil movement
... give full scale deflection. In addition, the sensitivity may be expressed as the number of millivolts across the meter when full scale current flows through it. This voltage drop is obtained by multiplying the full scale current by the resistance of the meter movement. A meter movement, whose resist ...
... give full scale deflection. In addition, the sensitivity may be expressed as the number of millivolts across the meter when full scale current flows through it. This voltage drop is obtained by multiplying the full scale current by the resistance of the meter movement. A meter movement, whose resist ...
SC805 Datasheet
... the typical application schematic on page 1 of the datasheet. When the NTC voltage from the divider is above or below the cold and hot temperature threshold values the SC805 will suspend the charge cycle by turning off the output, freezing the charge timer, and indicating a fault on the CHRGB LED. H ...
... the typical application schematic on page 1 of the datasheet. When the NTC voltage from the divider is above or below the cold and hot temperature threshold values the SC805 will suspend the charge cycle by turning off the output, freezing the charge timer, and indicating a fault on the CHRGB LED. H ...
DN290 - Monitor Network Compliant -48V Power Supplies
... across a wide variety of conditions. In order to accomplish this, the internal architecture is symmetrical. The LTC1921 is powered via the supply monitor input pins, VA and VB. Supply current can be drawn from either or both pins so the device can operate properly as long as one supply is within the ...
... across a wide variety of conditions. In order to accomplish this, the internal architecture is symmetrical. The LTC1921 is powered via the supply monitor input pins, VA and VB. Supply current can be drawn from either or both pins so the device can operate properly as long as one supply is within the ...
ESD Protection for Portable Electronic Products Tech Note
... The 150pf capacitor is charged by the DC voltage generator when the switch is connected to the 10 MΩ resistor. When the switch is moved to the other position, the energy stored in the capacitor will discharge through the device under test. ...
... The 150pf capacitor is charged by the DC voltage generator when the switch is connected to the 10 MΩ resistor. When the switch is moved to the other position, the energy stored in the capacitor will discharge through the device under test. ...
2.4-GHz Band Ultra-Low-Voltage LC-VCO IC in 130-nm CMOS Xin Yang Kangyang Xu
... of the maximum value. It can be seen that transistor's transconductance is not large enough in the low voltage operation. Hence, to satisfy the oscillation startup condition, decreasing the parasitic resistance of the LC resonant circuit (improving Q-factor of inductor and capacitor) is very importa ...
... of the maximum value. It can be seen that transistor's transconductance is not large enough in the low voltage operation. Hence, to satisfy the oscillation startup condition, decreasing the parasitic resistance of the LC resonant circuit (improving Q-factor of inductor and capacitor) is very importa ...
Technical Requirements for Connecting Small Scale PV (ssPV
... When the utility frequency is outside the range of 48.5 Hz and 51 Hz, the ssPV system shall cease to energize the utility line within 500ms. The purpose of the allowed range and time delay is to allow continued operation for short-term disturbances and to avoid excessive unnecessary tripping in weak ...
... When the utility frequency is outside the range of 48.5 Hz and 51 Hz, the ssPV system shall cease to energize the utility line within 500ms. The purpose of the allowed range and time delay is to allow continued operation for short-term disturbances and to avoid excessive unnecessary tripping in weak ...
AAT1235 数据资料DataSheet下载
... hysteresis threshold, which determines the inductor ripple current. Peak current is adjusted by the controller until the desired LED output current level is met. The magnitude of the feedback error signal determines the average input current. Therefore, the AAT1235 controller implements a programmed ...
... hysteresis threshold, which determines the inductor ripple current. Peak current is adjusted by the controller until the desired LED output current level is met. The magnitude of the feedback error signal determines the average input current. Therefore, the AAT1235 controller implements a programmed ...
Resistive opto-isolator
Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator or lamp-coupled photocell, is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically isolated from each other. The light source is usually a light-emitting diode (LED), a miniature incandescent lamp, or sometimes a neon lamp, whereas the detector is a semiconductor-based photoresistor made of cadmium selenide (CdSe) or cadmium sulfide (CdS). The source and detector are coupled through a transparent glue or through the air.Electrically, RO is a resistance controlled by the current flowing through the light source. In the dark state, the resistance typically exceeds a few MOhm; when illuminated, it decreases as the inverse of the light intensity. In contrast to the photodiode and phototransistor, the photoresistor can operate in both the AC and DC circuits and have a voltage of several hundred volts across it. The harmonic distortions of the output current by the RO are typically within 0.1% at voltages below 0.5 V.RO is the first and the slowest opto-isolator: its switching time exceeds 1 ms, and for the lamp-based models can reach hundreds of milliseconds. Parasitic capacitance limits the frequency range of the photoresistor by ultrasonic frequencies. Cadmium-based photoresistors exhibit a ""memory effect"": their resistance depends on the illumination history; it also drifts during the illumination and stabilizes within hours, or even weeks for high-sensitivity models. Heating induces irreversible degradation of ROs, whereas cooling to below −25 °C dramatically increases the response time. Therefore, ROs were mostly replaced in the 1970s by the faster and more stable photodiodes and photoresistors. ROs are still used in some sound equipment, guitar amplifiers and analog synthesizers owing to their good electrical isolation, low signal distortion and ease of circuit design.