Q410, AN-214, which utilizes OTL (Output Trans former Less) circuit delivering 3 watts to the speaker.


The power supply is designed to operate from either 100/110/117/200/220/234 volt AC 50/60 Hz or 12 volt DC (negative ground). For AC opera tion, +13.5 volts are supplied from full wave rectifier D408 and D409, VO6B.


The 13.5 volts are used for audio amplifier stage.


The DC voltage in both AC or DC operation is supplied to the voftage regulator Q1~1 , 2SD3 13, to obtain an extremely stable 10 volt DC supply which is used by the various circuits. The 10 volt DC is further regulated by zener diode D413, BZ-09 1, at 9 volts, and then supplied to the oscillators and harmonic generator circuits. When the AC supply fails, the DC voltage may be auto matically supplied to the circuit through the diode D410, VO6B, which prevents the rectified DC voltage from flowing into the battery.