michael1978
- Mar 17, 2012
- 388
- Joined
- Mar 17, 2012
- Messages
- 388
Guess what? It drives a power amplifier, not a speaker. Then the power amplifier drives the speaker.when i connect the speaker, there is no sound, nothing
View attachment 37311
you mean that is the error?Q5 and Q6 do not do anything.
R9 and R10 are connected in parallel to ground. R9 should be connected tp base of Q5.
C6 will give a lot of top cut.
are you sure the i need ic power amplifierGuess what? It drives a power amplifier, not a speaker. Then the power amplifier drives the speaker.
The poor Engrish should have said it is an FM tuner, not an FM receiver.
Almost everything in that lousy circuit is an error.you mean that is the error?
Yes.are you sure the i need ic power amplifier
thnx, so R9 must be connected to the base of Q5, but what do you think how to bias good Q6Almost everything in that lousy circuit is an error.
Yes.
1) If the output transistor was biased correctly (it is not) then its emitter will have about 2.5V on it and its current will be 2.5V/1.2k ohms= 2.1mA. Then its peak output current is 2.1mA. If you connect an 8 ohm speaker then its peak power will be only 2.1mA x 8 ohms= 0.017W and its RMS power will be only 0.008W which is almost nothing.
1W into 8 ohms is made with a peak current of 350mA (167 times the output current of this lousy circuit).
I agree that the 47k resistor is in the wrong location, it should connect to the base of Q5, not ground but then Q6 is still biased wrong.
2) The value of its output capacitor is only 4.7uF then all frequencies below 4260Hz will be cutoff into an 8 ohm speaker. FM stations play frequencies down to 50Hz or less.
Man you are a specialist, me i am beginner, i dont undertand thinks like you,, but i make mistake, i just gjange 47K, I al ready finish solderingQ5 and Q6 are a 2 transistors preamp. Here is how Philips did it 50 years ago when I worked for them:
i will send you circuits, i hope dont smile, is my second time soldering ;-)Man you are a specialist, me i am beginner, i dont undertand thinks like you,, but i make mistake, i just gjange 47K, I al ready finish soldering
Tthanks man very much, pfff i solderit alreadyI simulated the audio preamp Q5 and Q6 of the simple FM receiver but it did not work.
I fixed the circuit and simulated it but my resistors, capacitors and transistor numbers are different.
THANKYOU I UNDERSTAND? HAVE A NICE WEKEND ;-)I simulated the audio preamp Q5 and Q6 of the simple FM receiver but it did not work.
I fixed the circuit and simulated it but my resistors, capacitors and transistor numbers are different.