Day Sequerra
│
154 Cooper Rd. #902
│
W. Berlin, NJ 08091
│
Voice 856-719-9900
│
│
www.atiaudio.com
Caution:
Balanced differential outputs have active drivers for both HI and LO
output terminals. DO NOT GROUND either HI or LO terminals. Two separate
600 ohm unbalanced loads can be driven from each output without 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
IC power supply voltages are + and –16 VDC nominal. If zeners are replaced,
remove ICs and check output voltage before plugging ICs back into the circuit.
Remove power when inserting or removing or ICs.
IC output DC voltages (no signal conditions) should measure OVDC + .5 VDC.
Significant deviation indicates IC or circuit problem. Measurable DC difference
b amplifier inputs (other than due to meter loading) indicates IC failure.
MODIFICATIONS
230 VAC Operations
Your DA 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 R25 (R26) to 680 ohms, and increase C23
(C24) to 68 microfarads.
