Dylins random exam Q's Flashcards
Possible/most likely exam questions
Where is a RC Filter used
Can be added where ripple must be held to a minumum
What is the impedance and gain of a Power Amplifier Output
Low Impedance, High Current/Gain
3.4.2
Most used/ simple transformer for phase splitting
Centre Tap transformer
What does A-Stable mean
Cant stay in any stay, off wants to go on, on wants to go off
A logarithm of 0.6 gives what unit?
4
dBW measurement is compared to a reference level of ?
1 Watt
Whats the application of a comparitor?
Controls the temp of a heater in a circuit
Use for a transformer?
To step up or step down voltage
4 units of a power supply?
Transformer, Recitifier, filter, regulator
Purpose of a filter in a power supply
Eliminate the Ripple
Op Amp stages
Differential Amplifier
High Gain Amplifier
Power Amplifier
What are the requirements of barkhausen criteria ?
The feedback must be exactly one
What is slew rate?
The amount the output changed compared to the
Ideal op amp characteristics
Voltage Gain - Infinite
Bandwidth - Infinite
Input Impedance - Infinite
Output impedance - ZERO
What is open loop gain?
Gain with no feedback
Input resistance is generally between?
1MΩ to over 100 MΩ
Schmitt trigger is a method of?
Creating a squared wave from an analogue
Main advantage of a Transformer Coupling ?
Impedance matching
Phase splitting
What is the power source/ input in a switch mode , switch regulator?
DC or AC input
The fixed reference potential is supplied by what in a EMITTER-FOLLOWER REGULATOR
A zener Diode in series
Purpose of a transformer core?
To provide low reluctance for the magnetic flux
Purpose of a rectifier in a power supply
AC TO DC CONVERSION
Purpose of a PWM?
To regulate and controls the value of average current/voltage to control an output
Why is a two stage amplifier used for phase splitting?
As it can create two output signals that are 180 degrees out of phase
How does a Bi-stable Multivibrator complete a full cycle ?
It must be triggered On & Off to produce a full output cycle
How many states does an A-Stable multivibrator have?
Zero
Does the complementary symmetry require phase split input?
NO
In a Class A amplifier current flows for?
all 360 degrees of the input
Requirements of an Oscillator output
Constant Frequency
Constant Amplitude
Waveform purity
Does a Colpitts oscillator use split capacitance?
Yes
