ATI Audio DA1000 User Manual
Page 5
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interaction by connecting one between HI and GND and the other between LO and GND.
The two loads thus driven will be out of phase with each other.
MAINTENANCE NOTES
Power supply voltages are + and - 20 VDC nominal. Maximum allowable voltages are
+/- 22 VDC (limited by IC). If zeners are replaced, remove ICs and check output voltage
before plugging ICs back into the circuit. Remove power when inserting or removing
ICs.
IC output DC voltages (no signal conditions) should measure 0VDC +/- .5 VDC.
Significant deviation indicates IC or circuit problem. Measurable DC difference between
+/- amplifier inputs (other than due to meter loading) indicates IC failure.
If hit by lightning, replace Al through A3.
MODIFICATIONS
230 VAC Operation
Your DA1000 is wired for 115 VAC 50/60 Hz operations unless otherwise requested at
the time of ordering. It can be modified for 230 VAC use by removing the power
transformer primary jumpers J1 and J3 and inserting a jumper in the J2 holes.
GAIN
To increase gain by 10dB, change R13 to 680 ohms, and increase C15 to 68 uF.