Theatre Design & Technology - Oct 1972 - 29

puts automatically match and track with each other. The
shaped curve is produced by a transistor network with
excellent low-current response.
The shaping circuit provides a reference current signal
from the 24-volt dc control voltage (Fig. 3). At the same
time, a feedback reference current is provided by the lamp
voltage sensor. Both signals are fed into the rms comparator, and the resulting low-level output corresponds to the
proper turn-on phase angle plus or minus any error. A
small trimming potentiometer balances the feedback signal into this network.
The rms comparator feeds into a high-gain error amplifier stage and then into a network that limits the output
lamp voltage to whatever value is wanted at the top end of
the square-law curve. The signal then goes into a ramp
generator and trigger that produces a pulse when the ramp
voltage equals the trigger voltage. The pu Ise is ampl ified
by the gate drive amplifier and applied for thyristor
gating.
To provide a time reference, a reset is provided at each
line voltage zero point. Thus, the whole circuit is timed
and sampled every half cycle. It is very important to keep
both positive and negative sides of the waveform balanced
and perfectly symmetrical to prevent a dc current from
being impressed on the power line and to prevent generation of all the even harmonics.

Having the square-law curve built in means that there
are no adjustments to play with, a feature that is especially important in schools. The setting is tamper-proof.
Furthermore, the design eliminates errors in adjustment
giving nontracking lights. All lamps actually dim how and
when they are supposed to.
The new dimmers are available now in two basic models to cover a wide power range. All 120-volt styles have
been tested by Underwriters' Laboratories and are component listed. Other styles in 240 volts and 277 volts with
power capabilities in excess of 24,000 watts will be available late this fall.
The KAPP-2 model comes in 1800-watt and 2400-watt
ratings. It is intended for use with a low-voltage crossconnect system having one dimmer for each branch circuit.
The KAPP-1 model comes in nine different power ratings from 3000 to 12",000 watts. It is intended for use
with power cross-patch switchboards where one dimmer is
connected to more than one branch circuit. These dimmers have the additional feature of a built-in overload
circuit.
The overload circuit is a peak current sensing system
designed to allow a dimmer to tolerate approximately 200
percent of rated load without exceeding its current rating.
We do this not to condone overloading but to eliminate

Current
Transformer

Power

'eulrJI

Input
Thynstors

ReacEor

lamps

Circuli Breaker

Regulated
o-~4

V DC
Canuol

3-The dimmer's basic elements include power circu itry and control circuitry. I nput to the latter is a regu lated dc voltage from a
control system such as that diagrammed in Fig. 1. Arrows indicate information flow.

~

THEATRE DESIGN AND TECHNOLOGY

OCTOBER, 1972

29



Table of Contents for the Digital Edition of Theatre Design & Technology - Oct 1972

Contents
Theatre Design & Technology - Oct 1972 - 1
Theatre Design & Technology - Oct 1972 - 2
Theatre Design & Technology - Oct 1972 - 3
Theatre Design & Technology - Oct 1972 - Contents
Theatre Design & Technology - Oct 1972 - 5
Theatre Design & Technology - Oct 1972 - 6
Theatre Design & Technology - Oct 1972 - 7
Theatre Design & Technology - Oct 1972 - 8
Theatre Design & Technology - Oct 1972 - 9
Theatre Design & Technology - Oct 1972 - 10
Theatre Design & Technology - Oct 1972 - 11
Theatre Design & Technology - Oct 1972 - 12
Theatre Design & Technology - Oct 1972 - 13
Theatre Design & Technology - Oct 1972 - 14
Theatre Design & Technology - Oct 1972 - 15
Theatre Design & Technology - Oct 1972 - 16
Theatre Design & Technology - Oct 1972 - 17
Theatre Design & Technology - Oct 1972 - 18
Theatre Design & Technology - Oct 1972 - 19
Theatre Design & Technology - Oct 1972 - 20
Theatre Design & Technology - Oct 1972 - 21
Theatre Design & Technology - Oct 1972 - 22
Theatre Design & Technology - Oct 1972 - 23
Theatre Design & Technology - Oct 1972 - 24
Theatre Design & Technology - Oct 1972 - 25
Theatre Design & Technology - Oct 1972 - 26
Theatre Design & Technology - Oct 1972 - 27
Theatre Design & Technology - Oct 1972 - 28
Theatre Design & Technology - Oct 1972 - 29
Theatre Design & Technology - Oct 1972 - 30
Theatre Design & Technology - Oct 1972 - 31
Theatre Design & Technology - Oct 1972 - 32
Theatre Design & Technology - Oct 1972 - 33
Theatre Design & Technology - Oct 1972 - 34
Theatre Design & Technology - Oct 1972 - 35
Theatre Design & Technology - Oct 1972 - 36
Theatre Design & Technology - Oct 1972 - 37
Theatre Design & Technology - Oct 1972 - 38
Theatre Design & Technology - Oct 1972 - 39
Theatre Design & Technology - Oct 1972 - 40
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