Electronics > Beginners
Need Help Line Out To Tape Head Level
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Audioguru:
In addition to the line level to tape head level attenuation, you would need to do the opposite of the tape player equalization so that the signal resembles the tape pulses output.
dellsam34:

--- Quote from: Audioguru on March 04, 2019, 01:46:57 am ---In addition to the line level to tape head level attenuation, you would need to do the opposite of the tape player equalization so that the signal resembles the tape pulses output.

--- End quote ---

How do I achieve that?
Richard Crowley:

--- Quote from: Audioguru on March 04, 2019, 01:46:57 am ---In addition to the line level to tape head level attenuation, you would need to do the opposite of the tape player equalization so that the signal resembles the tape pulses output.

--- End quote ---

Chances are pretty good that the waveform from the signal generator will be cleaner and wider bandwidth (i.e. more "square") vs. the signal from the playback tape head (more "rounded" corners of the pulse waveform).  IOW, the signal generator signal could have nice sharp corners of the pulses because it hasn't been recorded to and replayed from tape.

So, depending on what is the point of the experiment, you could simulate the roll-off of the record->tape->playback path with a simple high-frequency roll-off.  The higher the frequency or the wider the head gap, or the lower the speed of the tape, the more high frequency roll-off you could expect.

OTOH you could just leave it "clean" if it is not important to the overall exercise.

If you are working with a regular waveform (like a sync clock), then a simple waveform (perhaps a square wave with the appropriate duty-cycle) out of a common signal generator would be good.  But if it is a more complex waveform (like SMPTE timecode, etc.) then many modern signal generators (even low-budget models) will support generating arbitrary waveforms as appropriate for your experiment.
dellsam34:
I haven't measured it, But it is for a consumer video cassette player, I believe it is either 59.94 Hz or 29.97 Hz square wave for the tape control track, Not sure about the duty cycle, I will have to look at the service manual, This is an effort to recover some video tapes where the control track area is completely damaged and the frame is rolling every few seconds.
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