R11 Triple Comparator and Schmitt Trigger

From a 1970s catalog: The TRIPLE COMPARATOR (COM) consists of three independent functions which are useful in the production of square waves and variable pulse waves. The Comparator reference level can be a time-varying control voltage, a complex audio signal, or a fixed preset voltage. Additionally, the comparators are useful for level detection and for logic decisions based on amplitude.


Left to right: 1973 panel, 1973 PCB

 

The schematic for the 1973 version.

PCB connections:
A = 3 + input
B = 3 ramp input
C = 3 output
D = 2 + input
E = 2 ramp input
F = 2 output
G = 1 + input
H = 1 ramp input
I = 1 output
J = Schmitt input
K = Schmitt output
U = not used (0v)
W = 0v
Y = +6v

 

Board with pots removed, courtesy of Dave Brown.

 


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