benji_styler
New Member
Hi im really struggling with some electronics theory questions which i have to submit 2mrw to complete my work.
Any chance any of you guys could help me out with them? Any help/direction would be much appriciated!!!
Here goes:
1.) An op amp has a gain bandwidth product of 3MHz. What is the maximum gain that can be obtained for an audio amplifier with upper cut-off frequency = 20khz?
2.) The transmitter of a TV broadcast repeater draws a current of 53A from a 450V supply. The output power to the transmitting aeriel is 10 kw. what is the transmitter efficiency?
3.) An audio amplifier delivers 300w maximum continous output power. it draws 2A from a 240V mains supply. How much heat needs to be displaced when the amplifier is running at full power?
4.) A portable radio transmitter has a 50 AH (e.g. produces 50A for 1 hour) 12V battery for the power supply. The transmitter output power into the aeriel is 100W. Its efficiency is 30%. the set-up is required to transmit continously at full power for 90 mins from a fully charged battery. can it be done?
5.) A manufacturer wishes to choose whether to use class A or class B for a new audio power amplifier design with a 100W outpu. The new design has to fit a casing which has sufficient ventilation to be able to dissipate up to 60W of heat continuously. What would you advise and why?
Any chance any of you guys could help me out with them? Any help/direction would be much appriciated!!!
Here goes:
1.) An op amp has a gain bandwidth product of 3MHz. What is the maximum gain that can be obtained for an audio amplifier with upper cut-off frequency = 20khz?
2.) The transmitter of a TV broadcast repeater draws a current of 53A from a 450V supply. The output power to the transmitting aeriel is 10 kw. what is the transmitter efficiency?
3.) An audio amplifier delivers 300w maximum continous output power. it draws 2A from a 240V mains supply. How much heat needs to be displaced when the amplifier is running at full power?
4.) A portable radio transmitter has a 50 AH (e.g. produces 50A for 1 hour) 12V battery for the power supply. The transmitter output power into the aeriel is 100W. Its efficiency is 30%. the set-up is required to transmit continously at full power for 90 mins from a fully charged battery. can it be done?
5.) A manufacturer wishes to choose whether to use class A or class B for a new audio power amplifier design with a 100W outpu. The new design has to fit a casing which has sufficient ventilation to be able to dissipate up to 60W of heat continuously. What would you advise and why?