Eëåêòðîíèêà   Dosmen systems     http://www.oocities.org/dosmen

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Based on the classic Baxendall tone control circuit, this provides a maximum cut and boost of around
10dB at 10K and 50Hz.  As the controls are passive, the last transistor provides a slight boost. The
 output is designed to feed an amplifier with input impedance of 10k to 250k.