ASR Audiosystems Friedrich Schaefer, D-35727 Herborn, Germany
High End Integrated Amplifier ASR Emitter Page 20
To prolong the lifetime of the batteries, please switch of the ASR Emitter HD after
approximately 80 hours of playing to fully charge the batteries. One hour of playing equals
approximately one hour of charging.
6.2 How the ASR Emitter works
The signal is passing the input and monitor relais and is routed straight to the relais step
switch to be controlled in its level. The amplifier consists of a FET-input-amplification-IC,
which controls the MOS-FET driver stage. This driver stage drives the MOS-FET output
stage.
The loudspeaker and/or headphone outputs are switched via relais. A green/yellow LED
each indicate the activation of the output relais for output A/B, a green LED indicates the
activation of the headphone output relais.
A micro-controller controlls the operation of the ASR Emitter. An EPROM (= programmable
chip) contains the control-programm of the micro-controller.
If the left knob on the frontplate of the ASR Emitter is brought to the „Off/0“-postion, a
green and yellow LED indicate, that the external power supply/supplies of the ASR Emitter
are connected to an AC outlet. If the left knob is brought to the „Standby“-position, the LED
above the right (input selector) knob are iluminated and the protection circuits are supplied
with voltage. The negative slave voltage of –10 volts is indicated by a yellow LED. In all
other postions of the left knob, the transformers in the separate power supply/supplies
is/are switched on to supply the amplifier section of the ASR Emitter – this is indicated by a
shining yellow LED in the separate power supply/supplies.
6.3 Technical Data
ASR Emitter: integrated amplifier with adjustable input sensitivity, relais step switch
volume control (75dB), remote control, six highlevel inputs switched via relais.
Input stage with FET inputs and separate voltage stabilization, output stage with high
internal feedback, completely assembled with complementary MOS-FETs, temperature-
depended regulation of bias 400/600mA (ASR Emitter I/II), amplifier operates mostly in
class a mode, DC amplification and offset-regulation is standard in every ASR Emitter.
PCB double-sided 2x 2x 120µ copper-lead-pewter, total signal routing on the pcb is
shielded, separate grounding for each channel (for signal routing and voltage supply, too),
pcb assembly with silver solder, no capacitors in the signal path, electrolytic and foil
capacitors are installed for buffering of the operational voltage.
External power supply with 2x 700 VA (ASR Emitter I)/power supplies with 4x 700 VA
(ASR Emitter II) rated power, with more than 1000 VA output (impulse) for each Philbert-
Mantelschnitt-transformer, separate transformers and rectifiers for positive and negative
voltages (two transformers each in separated enclosures per channel for the ASR Emitter
II). A built-in 72 VA transformer supplies the input stages and the controls with + 15 volts.
Five relais for each power supply are used as a choke circuit when switching on the
amplifier. The enclosures of the power supplies are made of heavy-duty metal for a better
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