11
AMPLUS™ 50 THEORY OF OPERATION
Introduction:
The AmPlus 50 Business Music Amplifier is a single channel amplifier in most ways
identical to the AmPlus 100. Both amplifiers are built in similar chassis using the same
PCBs, but most of the Ch 2 parts are omitted in AmpPlus 50.
Note: Refer to the appropriate AmPlus 50 Schematic diagram sheet as indicated below
for the following information.
Note: The designators inside the brackets “[ ]” are the schematic grid coordinates which
are provided to make it easier to locate components on the schematic sheet indicated in
the description.
Note: The components not used in the AmPlus 50 Amplifier are indicated on the schematic
diagram as optional (opt).
Sheet 1 of 3
The discussion for the AmPlus 100 applies to the AmPlus 50, with a few
exceptions. The Ch 1 and Ch 2 at J1[D8] inputs are summed after their input buffers
U100 and U101 [C/D7] and are passed through the Ch 1 path. There are no connectors
or slots for the #1 [J2] or #2 [J3] option cards, nor for the Ch 2 EQ card [J10]. There are no
line outputs, and only one remote volume control input [J4]. Only the DYNEQ 1 output
signal from Sheet 1 passes to Sheet 2. Only the CLIP / SC1 signal is passed into
Sheet 1.
Sheet 2 of 3
The discussion for the AmPlus 100 applies to the AmPlus 50, with a few exceptions.
Only the Ch 1 path of dynamic and fixed EQ circuits is populated, and only the Ch 1
power amplifier connector is provided. The output connector provides either 4 ohm or
70/100V CV, (Constant Voltage) outputs, as selected by S6 for Ch 1.
Sheet 3 of 3
The AmPlus 50 version is identical except that only the Ch 1 power amplifier module is
installed.
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