Схема и документация усилителя Other GENERALMUSIC SUBACTIVE

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BIAS ADJUSTMENT
Instruments, materials and tools:- Audio Generator- Dual Trace Oscilloscope- Digital Voltmeter (or Multimeter)- 4E 300W Resistor- Temperature MeterSetup:- Remove the Power Amplfier Board from the chassis keeping in connections with transformer and diode bridge;- turn VR1 clockwise up to end-stroke;- connect the audio generator to the input and set it to output 1KHz sinusoidal signal;- put the volume potentiometer at its maximum level;- connect the 4E 300W resistor to the amplifier output instead of the speaker;- connect the oscilloscope probe on the load (setting 20V/div., 1ms/div);- insert the temperature sensor through the interstice between the heat-sink and R59 (PTC);- insert the voltmeter terminals across R60.Adjustement Procedure1) Turn on the amplifier.2) Set the input signal to obtain 0dB (0.775Vms).3) When the temperature has reaches about 50°C set the signal input to minimum (0 or -
4) Adjust the trimmerVR1 to read a voltage of 10mV ±0.05mV on the multimeter.5) Check that the voltage across the R61 resistor has the same value.Veryfing:1) Increase the input level to obtain an output voltage about of 0.5Vpp.2) Check with the oscilloscope that the output signal is without a cross-talk distortion and eventually slightly adjust the VR1 position until distortiondisappears.3) The voltage value across the R60 and R61 resistors must not exceed 15mV.4) Re-connect the speaker instead of the 4E 300W resistor.
TECHNICAL SPECIFICATIONS
POWER AMPLIFIER (1KHz, THD 1%)
W (continuous)
values measured with
anti-clipping not inserted
Less than 0,1%
INPUT IMPEDANCE
30(balanced)
15(unbalanced)
INPUT SENSITIVITY
0 (0.775Vms)
POWER SUPPLY
230Vac ±15% 50/60Hz (EU) 115Vac ±15% 50/60Hz (US)
SENSITIVITY (SPL 1W/1m)
FREQUENCY RESPONSE
CROSSOVER FREQUENCY
Variable from 80 to 320 at 12dB/ott.
12" Woofer
CONSTRUCTION
Enclosure in polypropilene with mineral fibres and anti-scratch painting. Metal grid. 4 fixing points for SC accessories (SP LIVE and SP MEDIA)
Volume control
Earth lift. XOVER frequency control
CONNECTIONS
INPUT: 2Jack + 2female XLR
OUTPUT: 2Jack + 2maleXLR
mm (LxAxP)
530x386x443 20,8x15x17,4
21,5 · 50,9