Lexicon 960L Service Manual page 105

Lexicon
Bias voltage VB is derived from both +/-12VSUP by switching transistors Q1,Q2 and associated diodes and
capacitors. An ac coupled two-phase clock at wordclock rate drives the transistors with non-overlapping on-
times creating a 24V squarewave to augment the +12V, which in a perfect pump would make VB=36V,
neglecting losses. In practice, VB is somewhat over 30V at its normal load of approximately 40mA
(16*2.4mA).
7-27