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0 votes
3 answers
154 views

Elements of the amplifier - application and operation

I have a problem with a power amplifier from this application note. I am wondering about the elements shown in the circuit in the "Application Circuit" section. Can these elements be ...
MagicMan's user avatar
3 votes
2 answers
238 views

Is it a problem to connect a controlled current source in parallel to a voltage source?

Does a similar connection cause conflicts or damage? An example of situation in which it's used. I've seen it's common practice in RF to put an inductor (RF Choke) between the drain of a MOSFET and ...
Kinka-Byo's user avatar
  • 3,590
1 vote
2 answers
360 views

How is a class-C amplifier useful?

As I understand, class-C amplifier can only generate signal of constant frequency and amplitude. So the question is, how can it be useful and what are its applications?
Rodion Degtyar's user avatar
0 votes
0 answers
424 views

3W/6W audio amplifier using TDA2003

I am trying to build an amplifier circuit using TDA2003, I found a common type of circuit for this purpose in almost all the websites. I tried building it in Multisim and after some seconds of ...
Vishal's user avatar
  • 63
0 votes
0 answers
75 views

Class AB power amp DC bias at the emitter

I tried using KVL to prove that indeed the DC bias at the emitter of both Q1 and Q2 is Vcc/2. The following assumptions I made are: R1=R2 D1,D2 and the Base-Emitter diodes of both Q1 and Q2 are ...
Paumdrdo's user avatar
1 vote
1 answer
225 views

Logarithmic Multi - Stage Amplifier

let's consider this logarithmic multi - stage amplifier: Each stage is an amplifier with this mechanism: if the input signal is small (under a certain threshold), it is amplified with high gain A; if ...
Kinka-Byo's user avatar
  • 3,590
0 votes
3 answers
214 views

Power amplifier, does this circuit work?

I found that circuit for a power amplifier. Does it work? I want to build one for myself.
Markus's user avatar
  • 21
2 votes
2 answers
819 views

What's wrong with my1943/5200 Mosfet Amplifier? Blown on first run

I have just brought an 1943/5200 mosfet based amplifier board. Shopkeeper said it's rated for 24-0-24 AC. So I connected it with 24-0-24 transformer like this in image below. As soon as I turned the ...
GeekWithGlasses's user avatar
2 votes
1 answer
945 views

What do the inductors L2 and L3 do in the following rf power amplifier circuit?

I found a circuit online about an rf power amplifier working in the 88 to 108MHz FM spectrum. The circuit diagram is shown below I understand that an amplifier needs an inductor and a capacitor in a ...
Kevin Selva Prasanna's user avatar
1 vote
1 answer
527 views

Two diodes in input stage of power amplifier

Some of the power amplifier schematics include diodes in input stage like below. What is the purpose of them?
MaxMil's user avatar
  • 385
1 vote
1 answer
1k views

How RF Choke doubles Vcc at collector in BJT Power Amplifier

I'm trying to analyze a class A RF power amplifier as represented in the picture. The main thing I'm trying to understand is how the collector voltage can go to 2x Vcc as according to this page. ...
Frank's user avatar
  • 325
0 votes
3 answers
583 views

Differential stage Av value with current sources

Why all books told that Av differential of an differential input stage in power amp is very big? Ad = Rc/re, but if there are current sources in the emitter and collector circuit they will have too ...
MaxMil's user avatar
  • 385