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AC Bias Oscillator Circuit (Cassette Tape Rec.)

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Thread Starter

electronics_shamim

Joined Apr 28, 2007
10
Sir,

Does anyone having any idea or schematic about AC Bias Oscillator wired around BC148B or SL100 or any NPN-Transistor (with Bias Oscillator Coil) or any IFT of Radio set will do?

What is the ohms of AC Bias Erase Head. I understand Bias Oscillator frequency is applied for erasing as well as recording unto cassette tape. Is the frequency of AC Bias doubled at the time of high-speed dubbing (duplicating).

Any suggestions is highly solicited.

Regards,
Shamim_India.
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