bias generator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Audio equipment
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Most inexpensive radio tape recorders made in China (or other similar ones) do not have a bias generator. Erasing is done with a permanent magnet, and there is nothing wrong with that, but the biasing is done with direct current. It's just that current is passed through the head from the current stabilizer at best, and often simply through a resistor. As a result, the recording quality is far from perfect.
You can improve the quality of the recording if you introduce high-frequency bias into the tape recorder circuit. The circuit of a simple GPU is shown in the figure. Its output is included in the break of the wire going from the universal head to the common wire. Power is supplied to the generator only during recording, and the bias current is set by resistor R4.
For winding the transformer T1, a ferrite ring with an outer diameter of 10-12 mm is used. Winding 1 contains 2x15 turns of PEV 0,12 wire (winding is carried out in two wires), winding 2 - 200 turns of the same wire.
Author: S.Pavlov
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