mstechca said:Please make sure that every user that has read my answer(s) or questions is able to view this particular post BEFORE trashing it.
A number of you may be thinking about the answers I wrote, especially recently.
I have been rejecting (if you want to call it that), some answers because they don't seem to help. In fact, almost all answers come with no explanation. Worse yet, I get answers which require me to use a completely different, and more complicated circuit or an IC.
As some of you know I was a student at college, but now I am not because I can't afford a CENT for it! (even though I am working, and paying rent). When I do buy electronic components, I buy them cheap.
The problem with getting different circuits as answers or "change this...", "change that..." as answers is that I have to throw money in the garbage! (piece of a circuit board + whatever other components I can't get off).
If I can be explained WHY a certain configuration works over another, and WHY I shouldn't use a particular one, then I can understand better.
so the key thing here is the answers to the why
I'm not sure if this is the place for me.
..not everyone will always find time for prompt answer but this is still much faster way to get an answer compared to alteratives
I wasn't asking for anyone to write a book (of answers).Nigel Goodwin said:You can't expect a five year course as the 'why' for an answer....
To put the situation in perspective, it's very similar to this:
You want to dig your garden, say to plant potatos?, and you decide to use a banana to do so!. All us 'gardners' tell you that's completely the wrong implement, you should use a spade.
You completely ignore everyones advice, but continually ask for advice on using a banana to dig your garden.
This is EXACTLY what you have been doing!, except in electronics.
at least you do.We DO explain WHY your circuits don't make cents (sense)...
I see difficulties coming. I just want only one tuner, not two.It doesn't have a multi-tuned RF amplifier...
It has a self-quenching oscillator....with AGC, mixer and local oscillator.
I can live with an AM detector.It doesn't have a multi-tuned high gain IF amplifier also with AGC. It doesn't have an FM detector.
in 99% of the cases, yes. But I tend to control that by changing capacitor and resistor values.A super-regen overloads easily and has high noise and distortion.
toy, or not, if it works, that is all that matters to me.A real radio tuner has all these necessary things and doesn't need to tune to the side of an FM station to use an AM detector to "slope" detect it.
A super-regen tuner is a toy.
If I use varactors, then I will have to buy more stuff and pay moreWe explained WHY the outputs of a counter don't switch series capacitors in and out, which is necessary to tune your radios, and offered a simple and cheap varactor tuning method instead.
Small town? LMAORent? In your small town it is cheap. Come to the big city and see real rent prices.
I got an OK job.Of course in the big city well-paying jobs are numerous.
I understand, but I have my family to deal with. and I don't know if I get approved on a < $1000/month income.When renting you are throwing money away. You have a job so are able to buy a cheap house with a low-interest mortgage.
in general, yes. for the answers to "why this " and "why that " questions, no.Electronics education? The web is full of good information. I learned a lot from magazines at the library.
I think you just need a little common sense and some good luck.
A good FM tuner has a tuned LC network at its antenna then an RF amplifier with AGC followed by another tuned LC network for good selectivity and freedom from overload.mstechca said:I see difficulties coming. I just want only one tuner, not two.It doesn't have a multi-tuned RF amplifier...
Because the impedance of a 1000pf supply bypass capacitor is only 1.6 ohms at 100MHz. It is like a dead short.Why do you claim that VCC and ground are exactly the same at RF?
That could be done for mstecha's superregen.A good FM tuner has a tuned LC network at its antenna then an RF amplifier with AGC followed by another tuned LC network for good selectivity and freedom from overload.
Nigel Goodwin said:You want to dig your garden, say to plant potatos?, and you decide to use a banana to do so!. All us 'gardners' tell you that's completely the wrong implement, you should use a spade.
jrz126 said:Nigel Goodwin said:You want to dig your garden, say to plant potatos?, and you decide to use a banana to do so!. All us 'gardners' tell you that's completely the wrong implement, you should use a spade.
What if he were to freeze the banana?
:lol:
but 1.6 ohms isn't 0 ohms.Because the impedance of a 1000pf supply bypass capacitor is only 1.6 ohms at 100MHz. It is like a dead short.Why do you claim that VCC and ground are exactly the same at RF?
It's much closer to zero than any other part of your circuit.mstechca said:but 1.6 ohms isn't 0 ohms.
Why? Then your oscillator and counter won't work.I think I'll have to go with a high-impedance capacitor.
Why? Then your oscillator and counter won't work.I think I'll have to go with a high-impedance capacitor.
ALL circuits need a low impedance supply bypass capacitor.
I wouldn't call it an electronic circuit. It's just electrical.mstechca said:I managed to pull off an LED circuit without a supply cap. Just connect a battery, resistor and LED (the right way) in series.
Then it would be a good bypass at only its single resonant frequency. You need to bypass all frequencies and don't want resonance in a supply.I wonder if it is to my advantage to connect an inductor and capacitor in series and make that my bypass component instead.
Playhookey.com and I have done a two-transistor astable multivibrator without a bypass cap. Do you call that "electrical" too?audioguru said:I wouldn't call it an electronic circuit. It's just electrical.mstechca said:I managed to pull off an LED circuit without a supply cap. Just connect a battery, resistor and LED (the right way) in series.
and if I replaced it with a resistor...Then it would be a good bypass at only its single resonant frequency. You need to bypass all frequencies and don't want resonance in a supply.I wonder if it is to my advantage to connect an inductor and capacitor in series and make that my bypass component instead.
mstechca said:Playhookey.com and I have done a two-transistor astable multivibrator without a bypass cap. Do you call that "electrical" too?audioguru said:I wouldn't call it an electronic circuit. It's just electrical.mstechca said:I managed to pull off an LED circuit without a supply cap. Just connect a battery, resistor and LED (the right way) in series.
and if I replaced it with a resistor...Then it would be a good bypass at only its single resonant frequency. You need to bypass all frequencies and don't want resonance in a supply.I wonder if it is to my advantage to connect an inductor and capacitor in series and make that my bypass component instead.
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