Facebook
Google
GitHub
Linkedin
Moderators note: removed excessive images
Last edited by a moderator:
AM Radio Circuit
- Thread starter Dwight Jeffers
- Start date
Moderators note: removed excessive images
Hi, correct you are right. These are my questions:
1. A technician connects a voltmeter across R3 in the AM radio circuit. The voltmeter is set to measure DC voltage. The meter displays a reading of 0 V. Explain why the meter reading is zero volts.
2. Assume that the power switch for the radio is in the ON position, and that the battery is in good condition. A voltmeter placed at the junction of R4 and D2 displays a reading of 1.5 V. What should the voltmeter read from the anode of D1 to ground?
3. There are seven capacitors in the AM radio circuit—C1, C2, C3, C4, C5, C6, and C7 . Of these seven capacitors, list four that have no effect on the tuning of the radio.
4. In which direction would the wiper arm of R3 have to be moved to increase volume?
5. In the construction of an electronic circuit, using a circuit board instead of point-to-point wiring provides several advantages. List three of the advantages of the printed circuit board.
6. In the AM radio circuit, which two components form the tuning network?
7. In the AM radio circuit, list four of the six components that form the AM tuner.
8. In the AM radio circuit, which capacitor decouples the tuner output?
9. In the AM radio circuit, which component controls the volume, and which component couples the tuner’s audio output signal to the volume control?
10. In the AM radio circuit, which component is the power audio amp?
Hello, are you there?
The first step is to look at the schematic to understand whathe components do and how the are connected together. To save other members time in looking for the schematic this is a link to it. (On page 3) As this is homework DO NOT expect us just to give you the answers. First you must show us what work you have done to try to answer the questions.
Les.
Les.
Oh dear, it was nearly forty minutes and no one answered all of your homework questions for you. What is this world coming to?
Ok Thank you.
This is the answer that i have so far:
1. The reason why the meter reading is zero volts is because AM radio circuits works under AC signals
2.The voltmetere will read a different of 1.5 v with the ground being most positive. Electrical parts works as a different in peotential.
3.The Capacitors that have no effects on the turning radio are C1 and c3, C2 and C4.
4.The wiper arm of R3 have to move in the opposite directions to increase volume.
5.Three advantages of printed circuits board are : Ease of repair and Diagnostic, Saving of time, and Low cost.
6.L-C (indutor and Capacitor) form the tuning network.
7. Four of the six components that forms the AM tuner are C1,L1,C2 and L2.
8. The decoupling capacitor at position (G) removes the radio frequencies by passing them to ground.
9.In the AM circuit, the potentiometer controls the volume and the speaker couples the tuner's audio output signal to the volume control
10.In the AM circuit, the LM386 is the power audio amp.
This is the answer that i have so far:
1. The reason why the meter reading is zero volts is because AM radio circuits works under AC signals
2.The voltmetere will read a different of 1.5 v with the ground being most positive. Electrical parts works as a different in peotential.
3.The Capacitors that have no effects on the turning radio are C1 and c3, C2 and C4.
4.The wiper arm of R3 have to move in the opposite directions to increase volume.
5.Three advantages of printed circuits board are : Ease of repair and Diagnostic, Saving of time, and Low cost.
6.L-C (indutor and Capacitor) form the tuning network.
7. Four of the six components that forms the AM tuner are C1,L1,C2 and L2.
8. The decoupling capacitor at position (G) removes the radio frequencies by passing them to ground.
9.In the AM circuit, the potentiometer controls the volume and the speaker couples the tuner's audio output signal to the volume control
10.In the AM circuit, the LM386 is the power audio amp.
Most of your answers will get little to no credit.
For instance, for #1 saying that it reads 0 V because AM radio circuits work under AC signals is meaningless. Unless you are going to claim that a DC meter will read 0 V everywhere in that circuit. The question is asking about why the DC measurement across that particular component is 0 V.
Similarly, saying that the direction the wiper needs to move to increase the volume is in the opposite directions is completely meaningless. Opposite direction to what? The direction that decreases it?
Ok, So should I say because DC meters is not suppose to meassure AM signals?
The direction the wiper needs to move to increase the volume is in a clockwise direction.
Is the signal at the point being measured even an AM signal?
What is the purpose of C4?
What do you base that on? Neither the schematic nor the PCB give any indication (that I can see) about which end of the pot the wiper moves toward when it is turned clockwise.
The purpose of C4 is to block DC current from passing? also to store electric charge?
The reason why the meter is reading 0 V is because the switch is in the off position of because the capacitors are blocking the DC current from passing?
or*
Yes I read the manual.
I am trying to get my home work complete so I can send it in by tomorrow. Can any spend a few minutes of there time and help me out. I would really appreciate it.
The reason why the meter is reading 0 V is because the switch is in the off position of because the capacitors are blocking the DC current from passing?
or*
Yes I read the manual.
I am trying to get my home work complete so I can send it in by tomorrow. Can any spend a few minutes of there time and help me out. I would really appreciate it.
Last edited by a moderator:
Which is it? If it is storing electric charge, what is the purpose of doing so? What will that charge be used for later?
The switch is in the off position because some capacitor is blocking the DC current from passing? How is that happening? Just what kind of switch is this????
This OP deserves this kind...
https://en.m.wikipedia.org/wiki/Switch_(corporal_punishment)#Punitive_switching
The charge is use to operate the circuit.
10.In the AM circuit, the LM386 is the power audio amp. Correct?
What else would/could do that job?
