michael1978
- Mar 17, 2012
- 388
- Joined
- Mar 17, 2012
- Messages
- 388
Sir tomorow i gonna send you; i go now to sleep, thanks for time, have a nice sleepHave you still got the filter on the end of it?
Sir tomorow i gonna send you; i go now to sleep, thanks for time, have a nice sleepHave you still got the filter on the end of it?
Yes you are right, i gonna make now your oscillator, but one thing is possible to explain, when i dont connect the varicap, the sinewave is everything ok, but when i connect i get harmonis of bad sinewave, whait i will show you now my circuits...Have you still got the filter on the end of it?
noDid you use the schematic from WHONOES in post #71?
Is your varactor diode connected with the correct polarity?
When you vary the DC voltage V3 through R6 then does the frequency of the oscillator change?
YES SORYY,I TRY, BUT I TRY TO OUTPUT OF TRANSISTOR 2, why i does not change in transistor 2 outputDid you use the schematic from WHONOES in post #71?
Is your varactor diode connected with the correct polarity?
When you vary the DC voltage V3 through R6 then does the frequency of the oscillator change?
Hi again. I am pleased to see that you have now copied my schematic and that you are getting your simulation to work.YES SORYY,I TRY, BUT I TRY TO OUTPUT OF TRANSISTOR 2, why i does not change in transistor 2 output
The "Sim" knows all it needs to about the Varactor diode. My version works fine. I think our protagonist is still trying to simulate, it's just that his terminology is a bit misleading / confusing.If the varactor diode is connected backwards then it is not a variable capacitance part any more. Here is how it should be connected.
I am glad to hear that you built the circuit instead of simulating it because maybe your sim program does not know that a varactor diode changes its capacitance when you change the DC voltage across it.
If you built the circuit on a solderless breadboard then it will not work because capacitance between all the strips of contacts and wires is much too high. What meter did you use to measure its frequency?
Hello Audioguro, my circuits old is working perfect, only i remove the filters(THAT WAS THE PROBLEM)If the varactor diode is connected backwards then it is not a variable capacitance part any more. Here is how it should be connected.
I am glad to hear that you built the circuit instead of simulating it because maybe your sim program does not know that a varactor diode changes its capacitance when you change the DC voltage across it.
If you built the circuit on a solderless breadboard then it will not work because capacitance between all the strips of contacts and wires is much too high. What meter did you use to measure its frequency?
Hello sir, i build your circuit is working perfect, but also mine old circuits is working perfect, the problem was only filtes, so i just remove all filters and now perfect is working....Hi again. I am pleased to see that you have now copied my schematic and that you are getting your simulation to work.
I have no problem changing frequency.
By varying my V3 or your V1 from 10Vdc to 1V dc, I get a change in frequency from 107.49MHz (at 10V) to 99.28MHz (at 1V).
One more time me, why you use that 8ohm resistor in serie with inductor?Hi again. I am pleased to see that you have now copied my schematic and that you are getting your simulation to work.
I have no problem changing frequency.
By varying my V3 or your V1 from 10Vdc to 1V dc, I get a change in frequency from 107.49MHz (at 10V) to 99.28MHz (at 1V).
Hi again. I am pleased to see that you have now copied my schematic and that you are getting your simulation to work.
I have no problem changing frequency.
By varying my V3 or your V1 from 10Vdc to 1V dc, I get a change in frequency from 107.49MHz (at 10V) to 99.28MHz (at 1V).
AS I explained somewhat earlier, the 100mΩ resistor in series with L1 is actually the dc resistance of the coil and is not an additional resistor. R4 is there purely for the simulator otherwise it thinks that L1 is a perfect inductor. This means that L! will then have an impossibly high Q which will affect results.Hello sir i think i ask you of i forget, the what DO the resistor 100m, why he dont work from 88 to 108mhz, how can i build, because like i said my circuits he dont work i want to use yours like said maybe the mak mistake, i understand you now
Why have you resorted to the old circuit with C10 in series with L1 along with all the errors of your original circuit which clearly does not work?HELLO, i build the filter the same problem like min look the circuits
View attachment 42379
Thnx for explain, but i make the circuits like yours in -#71AS I explained somewhat earlier, the 100mΩ resistor in series with L1 is actually the dc resistance of the coil and is not an additional resistor. R4 is there purely for the simulator otherwise it thinks that L1 is a perfect inductor. This means that L! will then have an impossibly high Q which will affect results.
Why have you resorted to the old circuit with C10 in series with L1 along with all the errors of your original circuit which clearly does not work?
Also, if you tried to simulate the circuit in post #95, it won't work for apart from the basic errors, you have a transistor that is not connected to anything and one end of C6 left dangling. The spice platform does not like components being left like that and will simply refuse to work even if, the rest of the circuit is correct (which it isn't).
Is orginal you circuits, you think software problem?look this one i make mistake i forget to connect 47P in serie with varicap, i dont know what mistake i make now? View attachment 42382