Engineering, 12.03.2020 02:13 sherlock19

Sometimes, we need an amplifier with an accurate gain. Even using 1% tolerance resistors may not be sufficient to provide the required gain tolerance. In these designs, trimmer resistors must be used that can be adjusted after the circuit is built. Each resistor in the circuit can be replaced by a series combination of a fixed resistor and an adjustable resistor. Consider the inverting amplifier below with R1=47kΩ and R2=450kΩ. The source signal internal resistance varies from 0 to Rsmax=1kΩ. Only one trimmer resistor can be added, and it is going to be put in series with the feedback resistor. What are the lowest and highest values R must be able to have so that the gain can be adusted to Av=−10±0.5%? Assume that all resistors have 1% tolerance.

Answers: 2

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk

Answers: 1

Answer

Engineering, 04.07.2019 18:10

A-mn has a cubic structure with a0 0.8931 nm and a density of 7.47 g/cm3. b-mn has a different cubic structure, with a0 0.6326 nm and a density of 7.26 g/cm3. the atomic weight of manganese is 54.938 g/mol and the atomic radius is 0.112 nm. determine the percent volume change that would occur if a-mn transforms to b-mn.

Answers: 2

Answer

Engineering, 04.07.2019 19:20

Determine the time of the day and month of the year at which the peak sensible cooling load occurs for a top floor, north-eastern corner room of an office building in durban for the following conditions: floor area: 8 x 8 x 3 m east and north walls: 115 mm face brick (outside), 20 mm air space, 115 mm ordinary brick (inside) with 15 mm plaster roof construction: suspended plasterboard ceiling, 450 mm air space, 150 mm concrete, 75mm screed, waterproofing no heat transfer across other surfaces window area 3x 1,5 m high in north wall only. ordinary glass with venetian blinds. lights and occupants : from 07: 00 to 18: 00 average light density: 25 w/m2 number of occupants : 5 seated, light office work room temperature 24°c

Answers: 3

Answer

Engineering, 06.07.2019 02:30

Precipitation hardening can be achieved in many light alloys by a three-step heat treatment. what is carried out and what is the purpose at each step? why is such a treatment necessary based on the nucleation and growth theory of phase transformation. compare this treatment with tempering martensite for carbon steels (similarities and differences).

Answers: 1

Answer

You know the right answer?

Sometimes, we need an amplifier with an accurate gain. Even using 1% tolerance resistors may not be...

Questions