ae.1. Modulator Printed Circuit Board 85-127-x
I have been able to identify three (or possibly four) different revision levels (1, 2, 3) of
this board.
ae.1.1. 85-127P221 (SB-100, SB-101)
ae.1.2. 85-127-1 (SB-101)
ae.1.3. 85-127-2 (HW-100, HW-101)
R28 (22k) is the audio input from a phone patch and is not present as the HW-10x series does not
support a phone patch.
R9 (V3 cathode resistor connected to pins 3 and 8) is shown as 1k on the large schematic and 2k on the
“how it works” description. It appears that either value may be present depending upon the build date.
ae.1.4. 85-127-3 (SB-102)
Printed Circuit Boards (PCBs) Page 109
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