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Re: Cassette Tape Alignment [message #90679 is a reply to message #90678] Fri, 12 July 2019 15:59 Go to previous messageGo to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18717
Registered: January 2001
Illuminati (33rd Degree)

I did that for a while, and then decided to create a dual-tone signal that combined the 315Hz sine with the 10kHz sine. I monitored the output with Daqarta's spectrum analyzer so I could see both the 315Hz content and the 10kHz content. That made it easier to set the levels to match. Then as a "sanity check," I used single-frequency sines of 315Hz and 10kHz to make sure the levels were matched when a pure sine wave was presented.

Pay attention to the relative amplitudes of the signals below at 315Hz and at 10kHz:


/forum/index.php?t=getfile&id=2435&private=0
Before adjusting bias: Right channel bias NOT set

/forum/index.php?t=getfile&id=2436&private=0
Right channel bias properly set

/forum/index.php?t=getfile&id=2437&private=0
Left channel bias properly set


 
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