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Klaas Robers wrote:I guess the indication of the capacitors is the other way around. So 200V6 is 200 uF at 6V. But I never have seen this way of indicating the capacity and the max voltage. The input capacitor by the way is 2.5 uF.
There is absoluterly no reason to use a 200V capacitor in a circuit that is powered from a supply of 12V.
Metallica Man X wrote:Looks cool! I wonder how good of quality the wound will be....the next step with this little guy would be to use it to record NBTV signals (provided the quality is high enough lol)
harry dalek wrote:It had crossed my mind to try NBTV onit but i will do little steps i will be happy with any type of recording .
Viewmaster wrote:harry dalek wrote:It had crossed my mind to try NBTV onit but i will do little steps i will be happy with any type of recording .
The NBTV sync pulses are quite high frequency (.1 to .25 msec) so unless your recorder can handle this, forget them.
On my experimental wax cylinder recorder (The Edikow machine), I suppress the sync for recording (which gives better signal/noise as a bonus) and reinstate the sync by mechanical means on playback. If you ever try to record NBTV, it is easier to record an exact number of frames per rev and the sync can then be reinstated.
harry dalek wrote: I just finished experimenting theres a big problem mistake in the design using the tin the seam causes a big jump noise i was not expecting every time it gos around and the tin does not record well with this i can just hear stuff ...the head has to touch the Can this makes it worse .
harry dalek wrote: i suppose you used an encoder slot disk on it to match what you said amount of frames as the thing revolves once..
harry dalek wrote:
Working on magnetic recording have learned what works and what doesn't .
I don't know how accurate it revolves but if you get the head withing a few thou it might pick up OK. If it revolves not true maybe something called'an advance ball' might help. I use this on my machine. A small ball connected to a floating head runs on the surface just ahead of the detecting head (or cutter on mine) This will raise or lower the head and so keep it the exact distance from the recording surface.
Yes, as I have 'exactly' 3 frames per rev, so a swinging opto fork can generate new sync pulses from encoder holed disk. Another system blanks out the 31/63/95 pulse for framing via an AND gate......still experimenting BTW !
[/quote]That's the way to do it, Harry......carry on working.
harry dalek wrote:From playing around with it the head position is pretty critical ,the head should really be curved in to match the drum so thats the wrong way around for this .
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To simulate a reel to reel tape recorder I could give you piles of work, Harry, by suggesting that the tape is put 'inside' the drum.
The head mounted on an arm, ( just like internal boring on a lathe. )
Now the head would be in good contact with the recording tape, a convex head mating with concave tape.
OR, and this is much less work......as your present design, but the tape wound over thin foam sheet on the drum. The head slightly sprung into the tape and so indenting into the foam. This would achieve the convex head to concave tape mating............................maybe
You would need more power to drive this due to increased friction.
BTW, I read that as Friedrich Matthias invented the tape medium, including oxide and backing material, you could call your machine, if ever adapted to NBTV,
"The Matkow machine," (MATthias/nipKOW)
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