Hello again.
I havent read the datasheet properly but looking at the formula I get 10k for R1 and R2, and 470uF for Ct, 4k7 would be ok for a pullup, r comp ~22k or so.
An electrolytic 470u wouldnt be so good, you'd have to go for something like a tantalum bead cap for accuracy and low leakage.
Or use a 470n and a divide by 1000 or divide by 1024 counter.
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A 7812 can be used to supply a 10 pot with 10v, all you need is 2 1k resistors in series with the + supply end.
Breadboard is your friend here.
1) I find doing timing with large capacitors to be a problem. leakage and temperature stability
So if you have a (V to F) IC that you like then run it fast and use a counter IC to divide down by 1000:1.
1)
2) There are many little micro computers. (8 pin) They have a internal stable oscillator or can use an external crystal. They can measure a voltage in the 0 to 5 volt range. So your 10k pot could be connected across 0 and 5Volts. The micro can toggle a output pin at some frequency or time.
Because it is all software (math) you can have any function in between V and F. The disadvantage is that the micro can only measure the voltage in 1024 steps, so you can only have 1024 different frequencies. If you are turning the 10k pot by hand, the micro can read to 0.1 degree rotation. Is that good enough?
Not really... The micro in question can be fitted with two pots, one being a trimmer pot that can be used to affect the output to allow such modification... The tiny pic12f1840 has many, many features... As you are here in the UK I could help you with that!!! I want to design my own train controller... I have several engines and I too want all these things you speak of!!The figures outlined in my first post are relative to a model engine with x diameter wheels. What would happen if the wheel size changed? At the moment it would mean uploading a new math program to the micro I believe.
How are you planning to use the sub-10Hz frequency in conjunction with a pc/laptop? Are you aware that the frequency response of the average soundcard drops off a cliff below 20Hz? I'd be looking to generate frequencies in the middle of the audio spectrum.Once I have achieved this then it is relatively simple for me to apply, using midi and a pc/laptop, suitable chuff chuff sounds.
Why not just get a VtoF that runs over some normal freq range, like 1KHz to 10KHz, and follow it with a digital divide-by-100 (or 64 or 128) counter?
How are you planning to use the sub-10Hz frequency in conjunction with a pc/laptop? Are you aware that the frequency response of the average soundcard drops off a cliff below 20Hz? I'd be looking to generate frequencies in the middle of the audio spectrum.
I didn't think there was. One way of getting info into a PC is to convert the info to audio tones and poke those in through the mic input. I wondered if that was what you planned to do. Obviously notWhy did you think there was?
That sulzer motor sounded pretty good through my cheapo pc speakers,
But joking aside absolutely would work just the same. The way the audio (revs+ gear changes) is manipulated in the software sampler would be different but simple and not a problem. Ref space: Put the sound module and speaker in the car? Use real recordings of the cars. Simple's. Imagination rule's ok........if I had time & space that would be cool on scalextric.
If I get time away from the mrs this weekend I'll look into prototyping a 10hz vco, but I'll be using an Ne567 chip and the lowest freq will probably only be around 0.5hz.
One way of getting info into a PC is to convert the info to audio tones and poke those in through the mic input.
Nope, but I know a thing or 2 about napier deltics, not the loco the diesel engine, I rebuilt 3 at leyland motors where I used to work, fascinating machines, and they sound like nothing else.
Yep know where you are coming from.........I could be an anorak and get along with the odd one, but I cant keep it up for long just an hour here & there, fortunately.
The micro in question can be fitted with two pots, one being a trimmer pot that can be used As you are here in the UK I could help you with that!!! I want to design my own train controller... I have several engines and I too want all these things you speak of!!
The deltic has 3 cylinders in a deltoid, hence the name, there are no cylinder heads its an opposed piston.
The mrs likes your loco video.
That sulzer motor sounded pretty good through my cheapo pc speakers, if I had time & space that would be cool on scalextric.
If I get time away from the mrs this weekend I'll look into prototyping a 10hz vco, but I'll be using an Ne567 chip and the lowest freq will probably only be around 0.5hz.
If I get time away from the mrs this weekend.........
The deltic has 3 cylinders in a deltoid,
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